# Questions Asked onSeptember 11, 2014

1. ## 8th grade math

Henry claims that a line segment has a finite number of points because it has two endpoints. How do you respond?

2. ## 8th grade math

Maggie claims that to make the measure of an angle greater, you just extend the rays. How do you respond?

3. ## Algebra I

I need formula's for figuring out % problems. example 7 is what percent of 4 or %125 of what is 85? or 22.2% of 45 is ?

4. ## Math

Roberta is planning to buy a new car the different options she have is 1) Regular transmission or heavy duty towing transmission 2) two-door, four-door, or five-door 3)color: sleek silver, midnight black, upward grey, bold blue, or steady red In how many

5. ## Quantitative Reasoning (math)

Your weight on the moon is relative to your weight on Earth. Neil Armstrong weighed 360 lbs. in his moon gear while on Earth, but on the moon he only weighed 60 lbs. What is the ratio of the Earth weight to the moon weight? How much would you weigh

6. ## 8th Grade math

a student says there can only be 360 different rays emanating from a point since there are only 360 degrees in a circle. Is this true? Why or Why not?

7. ## Geometry

Make a valid conclusion in the situation. -If the measure of an angle is 90 degree, then it is a right angle. The measure of

8. ## Chemistry

the current U.S. penny is only 2.5% copper the remaining portion is zinc. Given the density of copper as 8.94 g/cm and the density of zinc is 6.57 g/cm, calculate the density of a penny.

9. ## Physics

A ball is dropped from a roof of a building and strikes the ground in 3 seconds. If a second ball is thrown horizontally from the roof, it will hit the ground in:

10. ## English

1. Each student is carrying a lunch box. 2. Each student is carrying lunch boxes to the nursing home. (Does #1 mean as follows? Each student has a lunch box. #2 is different, right? In #2, each student is moving lunch boxes to the nursing home, right? I

11. ## history

Can somebody help me here. Reasons for the transformation in southern africa around 1750

12. ## Force of Gravity

How far from Earth's surface would you have to travel to be 1/4 your weight. Give your answer in Earth radii. I know you have to travel twice the distance or 1 Earth radii... I just don't know how to mathematically show it. Please help.

13. ## Physical science

1. Nicotine,a poisonous compound found in tobacco leaves,is 74% carbon,8,65% hydrogen and 17,35% nitrogen (a)calculate the empirical formula of nicotine (b)what is the molecular formula of nicotine if it has a molar mass of 165 g.mol^-1

14. ## MATH

A HUMMINGBIRD BEATS IT WINGS 53X SEC HOW MANY TIMES DOES THE HUMMINGBIRD BEATS IN 5 SEC

15. ## mathematics

Write the following into sum or difference. Log (axb)

16. ## Strayer

An oil-drilling company knows that it costs \$25,000 to sink a test well. If oil is hit, the income for the drilling company will be \$445,000. If only natural gas is hit, the income will be \$165,000. If nothing is hit, there will be no income. If the

17. ## Math: pre calculus

a barn is 150 feet long and 75 feet wide. the owner has 240 ft of fencing and wants to construct two adjacent outdoor pens of identical size along the long side of the barn using the barn as one side of each pen. the owner wants the pens as large as

18. ## Chemistry - dilutions

The concentration of stain in the bottle was 5% and you added 100 microliters of it to 9.9ml of a buffer to make a working dilution of stain. You then combined 10 microliters of that diluted stain with 40 microliters of your diluted cells and put a few

19. ## chem

If 309 J of heat are removed from 10.0 g of ice (specific heat = 2.06 J/g ºC) at -5.5 ºC, what is the final temperature of the ice sample?

20. ## English

1. Everybody knows this book. 2. This book is known to everybody. 3. This book is known by everybody. (Which one is the passive voice of Sentence 1?) 4. Everybody knows Sam. 5. Sam is known to everybody. 6. Sam is known by everybody. (Which one is the

21. ## Acoustic

A breathing sphere of radius 0.1m radiates spherical waves into air at 100Hz with an intensity of 200mW/m2 at the distance 0.5m from the center of the sphere. In this case, 1) Compute the radiated acoustic power. 2) Compute the intensity at the surface of

22. ## Acoustic

How would you expect the directivity of the piston to vary as the temperature of air decreases? (Hint: Low temperature -> decrease of sound speed) 1.Directivity of the piston is independent of the temperature. 2.Directivity of the piston becomes smooth

23. ## Acoustic

Consider a room that is 6m long, 5m wide and 3m high and whose walls, floor and ceiling have the same sound absorption coefficient (α=0.01). When all machines are in use, the sound pressure level (SPL) within the room amounts to 90 dB. A carpet is to be

24. ## math

solving equation 7(√x/1-x) + 8(√1-x/x) = 15 following roots are obtained

25. ## math

solving equation 7√(x/1-x) + 8√(1-x/x) = 15 following roots are obtained

26. ## Physics

1. An 80.0-kg astronaut is floating at rest a distance of 10.0 m from a spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it into space away from the ship with a speed of 15

27. ## physics

A commuter backs her car out of her garage with an acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her deceleration?

28. ## physics

Assume that an intercontinental ballistic missile goes from rest to a suborbital speed of 6.50 km/s in 60.0 s (the actual speed and time are classified). What is its average acceleration in m/s2 and in multiples of g (9.80 m/s2 )?

29. ## ECT

ECT = Electronic Control Tech aka robotics So i need to make a project and i don't know what to make - not really homework but still please help me out.

30. ## phusics

We did not find any results for 'a ball is projected vertically up with an initial speed of 20m/sec and acceleration due to gravity is 10m/s^2then how long will it take for the ball to reach a point 10m above the point of projection second line'

31. ## 1

A student witnesses a flash of lightning and then t = 6.5 s later the student hears the associated clap of thunder. Sound travels at 343 m/s in the air. What distance from the student is the lightning strike, in meters?

32. ## Year 10 Algebra

A farmer is building a rectangular garden bed next to a river and has 8 metres worth of fence line to fence it off. I understand that the equation of this would be: A = w(8 - 2w) However, I am unsure what to do next

33. ## physics

A student witnesses a flash of lightning and then t = 6.5 s later the student hears the associated clap of thunder. Light travels at 3.0 × 108 m/s in the air. How long, t1, in seconds did it take the light to reach the student's eyes after the flash?

34. ## Grade 10 Maths

An area for planting crops is given by: A = 800 + 20x - 1/2x^2 Find the value of x which the area is a maximum

35. ## 2

A student witnesses a flash of lightning and then t = 6.5 s later the student hears the associated clap of thunder. Light travels at 3.0 × 108 m/s in the air. How long, t1, in seconds did it take the light to reach the student's eyes after the flash?

36. ## 2

Assume that an intercontinental ballistic missile goes from rest to a suborbital speed of 6.50 km/s in 60.0 s (the actual speed and time are classified). What is its average acceleration in m/s2 and in multiples of g (9.80 m/s2)?

37. ## maths a

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better?

38. ## maths a

us e the formula z=x-u/SD to determine the z score for a score of 34.5 a normal distribution if the mean is 46.5 and the standard deviation is 8.7

39. ## maths b

use the z score table to find the floolwing: a) p(1.2

40. ## math

What will be the answer of 4x(x-1)+5=0 when i'll use quadratic formula to solve it. Thank you ! ^___^

41. ## Maths

The first one iswhat angle does a 3.8m ladder make with the ground, if it reaches 2.1m up the wall? The second one is A concreter uses a ramp to wheelbarrow in sand from the ground level to floor level inside a building under construction. Floor level is

42. ## physics

A hockey puck truck at ice level just clears the top of a glass wall that is 2.80 m high. The flight time to this point is 0.650 s, and the horizontal distance is 12.0 m. Find a.) the initial speed of the puck and b.) the maximum height it will reach.

43. ## Physics 1

You are to drive to an interview. The interview is at 11:15 a.m. You plan to drive at , so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first , but then construction work forces you to slow to for . What would be the

44. ## physics

In a certain particle, a current of 0.50 mA is carried by a 5.0MeV proton beam that has a radius of 1.5 mm. Find the density of protons in the beam.if the beam hits a target, how many protons hit the target in 1.0s.

45. ## physics

A hockey puck truck at ice level just clears the top of a glass wall that is 2.80 m high. The flight time to this point is 0.650 s, and the horizontal distance is 12.0 m. Find a.) the initial speed of the puck and b.) the maximum height it will reach.

46. ## 3

An astronomy student is studying the sun. While monitoring her equipment, she observes a solar flare. She then observes the reflection of the solar flare off of a passing satellite and with her equipment she is able to determine that the reflected light

47. ## 3

t= 5.79 (a) There are approximately 1609 meters per mile. If the sun is 93 million miles away, how far is the sun in kilometers to two significant figures.

104 ml of ethene, C2H4 is burned in 408 ml of oxygen, producing carbon dioxide and some liquid water. Some oxygen remain unreacted. Calculate the volume of carbon dioxide produced and the volume of oxygen remaining

49. ## math

Please solve these using the quadratic formula: 1. 3x^2-4(x-2)=0 2.a^2+2(a++5)=0 3.x^2-3(2x+3)=0 Thank you ^____^

50. ## 6

A student begins at rest and then walks north with an average speed of v1 = 0.85 m/s. The student then turns south and walks with an average speed v2 = 0.45 m/s. (a) What was the student's overall average velocity vavg, x, in m/s, for the trip assuming the

51. ## 10

A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts =

52. ## math

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?

53. ## Math

Diagonal of rhombus are 24 and . Find its area and perimeter:/help me fast

54. ## 10

A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts =

55. ## math

An investment adviser invested \$14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was \$458. How much was invested in each account?

56. ## math

Running at an average rate of 4 meters per second, a sprinter ran to the end of a track. The sprinter then jogged back to the starting point at an average rate of 2 meters per second. The total time for the sprint and the jog back was 2 minutes 6 seconds.

57. ## physics

A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts =

asked by joe 10
58. ## math

A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later, a second plane leaves Los Angeles headed for Chicago at 620 mph. If the air route from Chicago to Los Angeles is 1800 miles, how long will it take (after the first plane takes off)

59. ## math

A jeweler wants to make a silver alloy to be used to make necklaces. How many ounces of a silver alloy that costs \$3.50 per ounce should be mixed with one that costs \$7.00 per ounce to make a new 30-ounce alloy that costs \$6.30 per ounce?

60. ## math

A new machine that deposits cement for a road requires 13 hours to complete a one-half mile section of road. An older machine requires 15 hours to pave the same amount of road. After depositing cement for 2 hours, the new machine develops a mechanical

61. ## physics

A runner is at the starting gate and hears the starting gun. He begins running with a constant acceleration ai = 0.55 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him tr to cross the finish line. It takes him ts =

asked by joe 10

v=1/3tt^2h

63. ## statistics

Henry performed a two- tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to compare his tobt with this tcv. Is he more likely to make a Type I or a Type II

64. ## chemistry

Calculate the ÄHvap , in kJ/mol, for ethanol, given that the vapor pressure at 45.0°C is 155.0 torr. The normal boiling point of ethanol is 78°C. Express your answer to two decimal places.

65. ## statistics

A researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, (u = 58). A random sample of 14 individuals who listen to

66. ## chemistry

mercury has a specific gravity of 13.6.How many mL OF mercury have a mass of 0.35kg.

67. ## Social Studies

The government must provide some goods and services because? A. they are too expensive for entrepreneurs to provide. B. demand for them is greater then supply. C. private producers have no incentive to do so. D. not many people are interested in buying

68. ## Physics Help!

The Fly wheel has a small magnet of mass M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated , which is passes to the c.r.o the display of the c.r.o is 10 cm wide . The flywheel is rotating at a rate of about 3000

69. ## Social Studies

Which of these goods and services is paid for with federal taxes? A. community roads. B. military bases C. public universities D. police protection. i think B

70. ## statistics

In this question, use Excel functions rather than Normal distribution tables. The number of new cars sold by "Ma's New Car Factory" in a financial year can be approximated by a normal distribution with a mean of 125,000 cars and a standard deviation of

71. ## Chemistry

If there are 0.625 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol.

72. ## writing

How do you write out a PEEL assessment?? (Point, Evidence, Evaluation, Language)

73. ## Social Studies

how would voters most likely react if political leaders raised taxes by 50% ? A. they would not make any changes in their behavior. B. They would demand more public goods and services. C. They would stop voting in elections. D. They would not re-elect the

asked by chris w
74. ## physics

the peregrine falcon is the world's fastest known bird and has been clocked driving downward toward its pray at a constant vertical velocity of 97.2 meters per second. If the falcon drives straight down from a height of 100 meters, how much time does this

75. ## CHEMISTRY

Classify these mixtures to homogeneous and heterogeneous a) orange juice b) tap water ( home water )

76. ## CHEMISTRY

Determine the solvent and solute in the following : a) carat 14 gold b) gaseous drinking ( pepsi for ex.)

77. ## CHEMISTRY

What indicator is better in the following titrations : 1) strong acid/strong base a) methyl red (4.4 - 6.2 ) b) bromophenol blue (6.2 - 7.6 ) 2) strong acid/weak base a) methyl orange (3.1 - 4.4 ) b) bromophenol blue (3.0 - 4.6 ) 3) weak acid/strong a)

78. ## CHEMISTRY

What is difference between equivalence point and end point in the titration ?

79. ## History

I am home schooled and I am suppose to ask people their ideas on how to solve the Social Security problem. It says in my book the population of working Americans is not growing quickly enough to fund continued increases in Social Security spending. At some

Which statement about Sarbanes-Oxley Act is true?

81. ## algebra 1

Rod left his house driving south. Marsha left three hours later, driving 42 km/h faster in an effort to catch up to him. After two hours, Marsha finally caught up. Find Rod's rate.

82. ## Math

∑(x+y) c. ∑(x+∑(y)) d. ∑x+ ∑y e. ∑(x)+ ∑(y)* what do each of these mean? what's the differences?

Describe the components of the accounting conceptual framework?

Identify the components that comprise the financial statements and briefly describe the purpose of each one

85. ## math

A gaint wheel in a fair had a diameter of 250 feet.what's the distance a person travels in one complete revolution?

86. ## maths

what number makes statement true: 30=0.3

87. ## Physics

How long is Mayra, a ballerina, in the air when she leaps straight up with a speed of 1.23 m/s?

88. ## Physics

How long is Mayra, a ballerina, in the air when she leaps striaght up with a speed of 1.23 m/s?

89. ## Math, Physics

A soccer ball is kicked from the ground at an angle of è = 46 degrees with respect to the horizontal. The hang time of the ball is tm = 1.9 s. What is the total horizontal distance traveled by the ball in meters?

90. ## Statistics

A poll was taken of a random sample of 1189 college students. Of these students, 789 reported that they had a drinking binge (more than 10 drinks in an evening) in the past month. Select the most believable conclusion. A. About 66.358% of college students

91. ## Physics - please check my answer

A man tosses a ball upward. It reaches its highest point after 25 seconds. Find its initial velocity. Alright, so I tried solving this. I used the equations (let v = initial velocity): h = v^2 / 2g , and h = (v*t) - (1/2)(g)(t^2) and I got 101.48 m/s. Is

92. ## math

An investment adviser invested \$14,000 in two accounts. One investment earned 4% annual simple interest, and the other investment earned 2.5% annual simple interest. The amount of interest earned for 1 year was \$458. How much was invested in each account

93. ## math

Running at an average rate of 4 meters per second, a sprinter ran to the end of a track. The sprinter then jogged back to the starting point at an average rate of 2 meters per second. The total time for the sprint and the jog back was 2 minutes 6 seconds.

94. ## math

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?

95. ## math

A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later, a second plane leaves Los Angeles headed for Chicago at 620 mph. If the air route from Chicago to Los Angeles is 1800 miles, how long will it take (after the first plane takes off)

96. ## math

Write in an integer that represents your height on the teeter totter that is relative to the balance point height: you are 8 inches below the balance point height or you are 15 inches the balance point height---your height is the opposite or your friend is

97. ## physics

The vertical acceleration of a projectile A)equals g pointing sometimes upwards and other times downwards. B)equals g pointing upwards C)is zero. D)equals g pointing downwards E)continuously increases. Thanks!

98. ## Statistics

The father of a junior high school student wants to determine the most popular book among junior high students. Select the sample with the least potential bias. A. A randomly selected group of 10 book sellers B. A randomly selected group of 30 junior high

99. ## Statistics

A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet

100. ## chemistry

If you have 0.833g of copper(II) sulfate, how many moles doo you have?

An example of a non-renewable resource would be... a. solar energy b. gold c. agricultural products d. a lbrary book Please someone help me with this problem as soon as possible!!!

102. ## English

"No justice no peace" I have to write a paragraph that explains this quote and persuades us to think the way you have.

103. ## Accounting

On March 1, 2013, the company lent a supplier \$23,000 and a note was signed requiring principal and interest at 9% to be paid on February 28, 2014. If the journal entries are intrest recievable intrest revenue how much should I allocate to each section?

104. ## math

The length of a rectangle is 3 feet less than twice the width of the rectangle. If the perimeter of the rectangle is 144 feet, find the width and the length

105. ## biology

why do potatoes and onions have reducing sugar present.

106. ## biology

why do potatoes and onions have reducing sugar present

107. ## Calculus II

find the distance between the given parallel planes 5x-5y+z=10 and 10x-10y+2z=2. I got 9sqrt51/51

108. ## physics

A student witnesses a flash of lightning and then t = 6.5 s later the student hears the associated clap of thunder. Sound travels at 343 m/s in the air. What distance from the student is the lightning strike, in meters?

asked by joe 10
109. ## Physics Help Please

1) two cars start at the same location and accelerate for the same amount of time. if one car has twice the acceleration of the other, how will the final speeds of the cars compare? by how much farther will the faster car outdistance the slower car?

110. ## Physics Help

On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? Show steps please! Thank you!

111. ## English

Write two paragraphs about how social media has changed the way you think about written communication

112. ## Music

if you add up the durations from left to right on any level of a note tree you end up with a what?

113. ## Physics Help

a) On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? On the same conveyor belt as described in

114. ## Intro-Physics

Using a Doppler ultrasound, the velocity of blood flow in a vein or an artery can be measured. In a particular patient, the flow in a particular artery is found to be 30 cm/s at one point, and 20 cm/s at a point farther from the heart. If the two points in

115. ## physics

Sound travels at 343 m/s in the air. What distance from the student is the lightning strike, in meters? Write an expression that describes the skydiver's average speed, v1 during the period before opening the chute in terms of the given quantities.

asked by joe 22
116. ## physics

A skydiver falls d1 = 495 meters in t1 = 22 s before opening his parachute. After the chute opens, he falls an additional d2 = 470 meters in t2 = 56.5 s. Write an expression that describes the skydiver's average speed, v1 during the period before opening

asked by joe 22
117. ## Physics

At bat a baseball player hits a ball at a height of .889 m. The ball leaves the bat at 51 m/s at an angle of 81 degrees from the vertical. The ball skims the top of a 2.74 m wall as it leaves the field. a.) Draw position, velocity and acceleration graphs

118. ## Integers

Billy buys 3 doze light bulbs. After changing the lightbulbs in the house, he has 15 light bulbs left. How many lightbulbs did he use? Multiply and Divide Interger problem. Please show me steps how to solve?

119. ## english

1. The flagman tells the man it is not his job to ____ (1 point)answer questions. give directions. issue tickets. give advice. 2. _________ is the woman’s worst enemy. (1 point)Love Loneliness Fear Time

120. ## algebra

Find the price of any container of lemonade at a local grocery store. (You can also find prices in advertisements and on the Internet.) Make sure you write down the number of fluid ounces in the container. Determine the unit price and post the information.

121. ## Science!

Which of the following is a valid reason why a scientist might reject a scientific theory? A. Some people disagree with it. B. It covers too broad a topic. C. New evidence contradicts it. D. It is too old. Is the answer C?

122. ## science

Which of the following is an example of a physical system? hurricanes Volcanoes Glaciers Plant & Animal Communities ***All of the Above*** is it all of the above? Pls help asap!

123. ## Science - Please Check My Answers

Please help me with the following: Which is usually the best way to present or communicate inferred data? A. in a bar graph B. in a data table C. in a simple diagram D. in a written paragraph I know the answer isn't C or D(I got C wrong), but now I think

124. ## rela

the interloper by saki creates an effect of surprise, how? can one of them be situational irony? what other ones?

125. ## math

sum of 3 number is equal 39 , the second number is half of third number ,and the first number less than third number by 1,the result must be 6 degit ?

126. ## Math Multiplication

What are all the multiplication facts for 60,36,48,20,25,40,50,30,100,15,18,and 12?

127. ## Math

What is the sum of all the positive numbers smaller than 100,000 where all digits can only be 1 or 0.

128. ## Statistics

One month before a recall election, a poll of 500 Wisconsin voters showed that 46% planned to vote for the Democratic challenger Tom Barrett and 45% planned to vote for Republican Governor Scott Walker. Undecided voters constituted another 9%. The margin

129. ## Social Studies

Which period of history was influenced by the classical Greek and Roman works? A. Renaissance B. Age of exploration C. Technology era D. Dark Ages Is the answer A?

130. ## Social Studies

Which of the following is an example of how the first Americans adapted to their resources? A. The lived along coastlines and fished. B. Settlers near the Arctic circle built homes of reeds and branches. C. Settlers in present-day Mexico built houses of

131. ## Physics

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.880 m/s at an angle of 34.1° above the table, and it lands on the magazine 0.0790 s after leaving the table. Ignore air resistance. How thick

132. ## math

the ratio relationship betweeen 19:7 and 7 to 26

133. ## math

he number of block has 9 in the ones place. the number in the hundreds place is one more than the number in the tens place, those two numbers equal 11. how many blocks are there?

134. ## Biochemistry

Calculate how you would make 0.5L of a 0.5M (500mM) acetate buffer at a pH of 4.7. Available is sodium acetate and glacial acetic acid. pH=4.7 pKa of acetic acid=4.76 Not sure if I did this next part right: 4.7=4.76 + log [base]/[acid] -0.06= log

135. ## Social Studies

Great early American civilizations built large cities A. in Central and South America. B. In Alaska C. on the plains of North America D. in Asia Is the answer A?

136. ## Social Studies

Spanish explorers first arrived in the Americas A. In the ninetenth century B. In the late 1400s C. In the late 1500s*** D. In the seventeenth century Is the answer C?

137. ## Science

What is the first step in the scientific method? (I WAS ABSENT DURING LESSON) A- Observation B- Hypothesis C- Conclusion D- Test

138. ## science

Which of the following is a good study habbit.

139. ## rela

how does the interloper by saki creates an effect of surprise?

140. ## Social Studies

The Dutch, English, and french explorers of the 1500s and 1600s were seeking A. A direct water route to asia*** B. English speaking Native Americans. C. The gold of the Aztec Empire D. Corn, tobacco, and squash Is the answer a?

141. ## chemistry

which of the following is true regarding the transition elements? A. Multiple oxidation states resulting from the involvement of d electrons in bonding is a characteristic of transition elements. B. Most transition elements have lower melting and boiling

142. ## Social Studies

Early Americans became farmers and formed communities ounce they had A. Europeans to help them B. Money C. A dependable food supply D. Clay to build homes Is the answer C?

143. ## 7th grade math

Carrie has a 10ft long plank of wood. She want's to cut three pieces that are each 2 2/3 feet long from the plank. how long will the plank be after she cuts off the three pieces?

144. ## 7th grade math

A large carton of juice holds 12 cups. How many 3/4 cup servings does the carton hold? I'm not sure how to solve it at all.

145. ## physics

When the Sun is directly overhead, a hawk dives toward the ground with a constant velocity of 4.80 m/s at 50.5° below the horizontal. Calculate the speed of her shadow on the level ground. What i have done: x= rcos(theta) x=4.80m/s*cos(309.5) x=3.05m

146. ## Science

What is apparent brightness and absolute brightness in Science

147. ## math

R=10 d=20 c=d||

148. ## statistics

Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F will occur.

149. ## Science

What is a protostar

150. ## Science

What is red shifting and blue shifting

151. ## Algebra 1

the temperature at noon in los angeles on a summer day was 88 degrees fahrenheit. during the day, the temperature varies from this by as much as 7.5 degrees fahrenheit. write and solve an absolute-value inequality to find the range of possible temperature

152. ## Math

i am a 4 digit odd number none of the numbers are 0-9 the tens digit is twice the ones digit the hundreds digit is twice the tens digit and the thousands digit is one less than the hundreds digit

asked by Erin webb
153. ## Math

consider the polynomial (x-a)(x-b)and the real number line Identify the points on the line where the polynomial is zero. In each of the three subintervals of the line, write the sign of each factor and the sign of the product.For which values does the

154. ## geometry

One endpoint and the midpoint of a segment are given. Find the coordinates of the other endpoint. Show all your work. A. Endpoint: (-1,9) Midpoint: (-9,-10) Endpoint: _______ B. Endpoint: (9,-10) Midpoint: (4,8) Endpoint: ________

155. ## Math

CAN SOMEONE CHECK MY ANSWERS PLEASE? What types of problems can be solved using the greatest common factor? What types of problems can be solved using the least common multiple? Complete the explanation. *** Use the words 'same' and 'different' to complete

156. ## Math

Write a TRUE equation and explain why it is true. Ex.) 4+3=7

157. ## math

you research the cost of a gallon of gasoline over several years to look for trends the table shows the data you have collected what is the equation of the line of best fit how much would you expect to pay for gasoline in 2029 a)y=0.538x+1.36; \$33.10 b)

What types of problems can be solved using the greatest common factor? What types of problems can be solved using the least common multiple? Complete the explanation. *** Use the words 'same' and 'different' to complete the following sentences.*** Problems

159. ## MATH

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?

160. ## Physics

A kayaker needs to paddle north across a 85 m wide harbor. The tide is going out, creating a tidal current that flows to the east at 1.6 m/s. The kayaker can paddle with a speed of 2.8 m/s. (a) In which direction should he paddle in order to travel

161. ## MATH

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution

162. ## MATH

v=1/3ttr^2h; h(geometry)

163. ## Geometry

If EF= 10x+12, FG=14, and EG= 136, what is the value of x?

164. ## Biology

What is a reactant that binds to a catalyst? Answer: a catalyst An enzyme is a kind of what? Answer: a substrate

165. ## Math

consider the polynomial (x-a)(x-b) and the real number line In each of the three subintervals of the line, write the sign of each factor and the sign of the product.For which values does the polynomial possibly change signs?

166. ## math

You have several 5x11 rectangles, using only these rectangles, what can you make? A) 39x54 rectangle? B) a 39x55 rectangle? Plz help my parents are at work and sisters are doing homework, I'm 9 help!!! ( math due tomorrow!! )

167. ## algebra

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island

168. ## Physics Help

1) two cars start at the same location and accelerate for the same amount of time. if one car has twice the acceleration of the other, how will the final speeds of the cars compare? by how much farther will the faster car outdistance the slower car?

v=1/3TTr^2h;

170. ## Physics Help Please

a) On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? b) On the same conveyor belt as described in

171. ## Math

(8 divided by 7 + 5 )+ 2 squared x 8

172. ## Math

4 x (2 +7 +6 )

173. ## math

What fraction of 4/5 is 1/2?

174. ## Ecology

8.Which of the following examples of an ecological study involves the ecosystem level of organization? A.The effects of human activities on biogeochemical cycling B.The effects of an invasive plant species on bird nesting sites C.The effects of competition

175. ## college chemistry

Express the concentration of a 0.0620M aqueous solution of fluoride, F-, in mass percentage and in parts per million. assume the density of the solution is 1.00g/mL.

176. ## Biology

What is a reactant that binds to a catalyst? Answer: a catalyst An enzyme is a kind of ? Answer: a substrate

(1 - 5 ) + 9

178. ## science

If you had an object that measured 4.0 cm for width,and 4.5 cm for height.how would you calculate the volume for this object?

( 6-6 ) +7

180. ## Math

( 3 - 4 - 1 )

181. ## math check PLEASE

which fraction si greater than -7/5? a.-5/9 b.-6/11 c.-1/2 d.-4/9 i think its A

182. ## Math

( 9 / 3 x 6 )

183. ## Help Ms.Sue

I just wanted to know how to do: What fraction of 4/5 is 1/2?

184. ## physics

How far is the rocket from the launch pad 8.50s later when the rocket engine runs out of fuel?

185. ## Differential Equations

Classify the following differential equations as linear or nonlinear: 3x' +5x=7t^2 4x^2+2x+5tx=0

186. ## math

The total cost of 6 pens and 8 rubber is Rs.38. If a pen costs Rs. 4 more than a rubber, find the price of each item.

asked by Aryan ale
187. ## Science

So what would you find something in the house? Product Symbols Precaution One example would be appreciated

188. ## statistics

What is the mathematical relationship between the confidence level and the level of significance, α? Can you explain this to me in an easy to understand way? Thank you

189. ## PLZ HELP DUE TOMORROW!

Write the numbers1, 2, 3, 10, 11, 12, 19, 20 and 21 into the fields of a 3x3 grid so that the sum of the numbers in each row, column and diagonal is the same. PLZ HELP DUE TOMORROW!

190. ## chemistry :)

Write the formula for the polyatomic ion in NaNO 3. Write the formula for the polyatomic ion in Ag2CO3. Write the formula for the polyatomic ion in NaHCO3. Write the formula for the polyatomic ion in BaSO4

191. ## 5th grade math

A small company packs 12 jars of jlly into each of 110 boxes to bring to the farmers market. how many jars of jelly does the company pack in all

192. ## math

gary is 61 1/8" tall. His friends gino and gilbert are 56 1/2" tall and 63 1/8" tall. what is the average height of the three friends. Do i divide my answer by 3?

193. ## math

order the numbers from least to greatest. _ 1 4/5, 1.78, 1 5/6, 7/4, 1.7, 1 8/11 I am confused on going back and forth between decimals and fractions.

194. ## math help

emaily says that she can convert 18/25 to a decimal by using equivalent fractions instead of dividing 18 by 25. Use emily's method to convert 18/25 to a decimal. I am confused because there is not just 1 number equivalent to both 18 & 25. There are 2

195. ## science

Suppose that a biologist states that the average height of undergraduate students at your university is 205 cm plus or minus a standard deviation of 17 cm. What does this mean? Does it mean that the height of undergraduates at the university ranges from 17

196. ## Physics Help

Freshly picked cucumbers are dropped into a bin from a height of 1.25 m above the bottom of the bin. Assuming that the bin is empty, how fast is a cucumber going when it hits the bottom of the bin? How much time does it take the cucumber to fall to the

197. ## math

1. A grayhound's maximum speed is 39.35 mph how long does it take to run a quarter mile? 2. A human's maximum speed is 27.89 mph how long does it take to run a quarter mile? 3. A giant tortoise's maximum speed is 0.17 mph how long does it take to run a

198. ## Geometry

M is the midpoint of LM LM=3x+5 LN=5x+40 Find MN I've tried to work this out several times and am pretty sure I start it off by 3x+5=5(x)+40 but I keep getting a negative answer or a fraction for X and know that is not right. Can someone please help me?

199. ## Physics Help

Divers for many years have dived into the ocean from the cliffs of Acapulco, a distance of 35 m above the water. How fast are the divers moving when they hit the water? If the divers travel a distance of 5 m through the water before momentarily coming to

200. ## Chemistry

Complete each calculation. Express your answer to the correct number of significant digits. a)4.02mL + 3.76mL +0.95mL b)(2.7 x 10^2m) x (4.23 x 10^2m) c)5092kg divided by 23L d) 2-6.3 + 6-7 e)(6.853 x 10^3L) + (5.40 x 10^3mL) f)(572.3g + 794.1g) divided

201. ## college math

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?

202. ## college math

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution

203. ## college math

v=1/3ttr^2h; h(geometry)

204. ## Physics

A car traveling 91km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.93m . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's,"

205. ## Algebra

If 6 is a root of the equation x^2-8x+k=0, find the value of k.

206. ## ?

What challenge have you faced lately? ask at least 5 people

207. ## math

A cement block accidentally falls from rest from the ledge of a 51.6 -m-high building. When the block is 15.7 m above the ground, a man, 1.90 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to

asked by kingsley danon
208. ## Poll

Have you ever been a hero? If so, what did you do

209. ## algebra

Alicia finished the race 3.75 seconds befor Kaye. Donna finished the race5.09 seconds after Carmen. Carmen finished the race 10 second before Kaye. Anders finished 4.89 seconds after Kaye. How many seconds earlier did Carmen finish than Anders?

210. ## History

What was the Civil War about? I know it was between the North and South over slavery but what else

211. ## Physics

When Babe Ruth hit a homer over the 10m -high right-field fence 110m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.0m above the ground and its path initially made a 32∘ angle with the

212. ## math

write two ratios that are equivalent to 1:1

213. ## physics

A 2 μC charge is placed at × = 1 m while a second 2 μC Charge is placed at x=-1. Find (a) the electric field at y = 0.5 m, and (b) the electric force a -3 μC charge placed at y=0.5 m.

asked by JAY Z
214. ## physics

A bullet is fired through a wooden board with a thickness of 8.0 cm. The bullet hits the board perpendicular to it, and with a speed of +350 m/s. The bullet then emerges on the other side of the board with a speed of +210 m/s. Assuming constant

215. ## English

1) is real-life one word? My teacher considered it to be. 2) then would Spanish-Americans be one word?

216. ## Chemistry

If we heat a 10 g sample of gold and a 10 g sample of iron with 50 kJ of energy each, which will have the greatest change in temperature? gold specific heat= 0.129J/g degC) iron specific heat = (0.452 J/g degC)

217. ## Arbitrary signs

Can someone explain to me what arbitrary signs are and some examples.. The websites on google confuse me.. Does anyone know of any good sites?

218. ## Physics

A small fish is dropped by a pelican that is rising steadily at 0.44 m/s. After 2.6 s, what is the velocity of the fish? The acceleration of gravity is 9.81 m/s^2 Answer in units of m/s & How far below the pelican is the fish after the 2.6 s? Answer in

219. ## Chemistry

If 155 J of energy is added to 18.5 g of silver, how much will the temperature rise? Silver Specific Heat= (0.235J/g deg C)

220. ## Chemistry

A frozen dinner contains 1.5 g of fat, 14 g of carbohydrates, and 11 g of protein. How much energy is contained in this meal? Food energy Carbohydrate 4kcal/g Fat 9kcal/g protein 4kcal/g

221. ## physics

A speedy tortoise can run at 0.12 m/s, and a hare can run 18 times as fast. In a race, they start at the same time, but the hare stops to rest for 1.5 min, so the tortoise wins by a shell (20 cm). How long does the race take? Answer in units of s

222. ## Chemistry

A 5 oz carrot is burned in a calorimeter containing 10.0 lb of water. The water heats up from 20.5 oC to 22.8 oC. How many Calories are in the 5 oz carrot? Round to correct sig. fig. 1 Cal = 1000 cal.

223. ## Physics

A soccer ball is kicked from the ground at an angle of θ = 41 degrees with respect to the horizontal. The hang time of the ball is tm = 0.9 s. What is the horizontal distance in meters??????

asked by Lauren HELP
224. ## chemistry

solution of 0.1molar NH4OH and 0.1 NH4CL ph=9.25 calculate kb for NH4OH?

225. ## Physics

A plane flies towards a ground-based radar dish. Radar locates the plane at a distance D = 41 km from the dish, at an angle θ = 52° above horizontal. What is the plane’s horizontal distance, DH in meters, from the radar dish??

asked by Lauren HELP
226. ## physics

A cement block accidentally falls from rest from the ledge of a 51.6 -m-high building. When the block is 15.7 m above the ground, a man, 1.90 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to

asked by kingsley danon
227. ## Math

Write 3 different numbers with 7 ones.

asked by Dana carlton
228. ## Physics

At the local swimming pool, the diving board is elevated h = 7.5 m above the pool surface and overhangs the pool edge by L = 2 m. A diver runs horizontally along the diving board with a speed of v0 = 3.4 m/s and then falls into the pool. Neglect air

asked by Lauren HELP
229. ## Physics

Heather and Jerry are standing on a bridge 43m above a river. Heather throws a rock straight down with a speed of 12m/s . Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance.

230. ## Physics

A ball is thrown horizontally from the top of a 65 m building and lands 105 m from the base of the building. Ignore air resistance, and use a coordinate system whose origin is at the top of the building, with positive y upwards and positive x in the

asked by Lauren HELP
231. ## Math

Write 3 different numbers with 7 ones. ------- --------- --------

asked by Dana carlton
232. ## Science

What is spectral broadening, Quasars, and the Expansion theory

Complete each calculation. Express your answer to the correct number of significant digits. a)4.02mL + 3.76mL +0.95mL b)(2.7 x 10^2m) x (4.23 x 10^2m) c)5092kg divided by 23L d) 2-6.3 + 6-7 e)(6.853 x 10^3L) + (5.40 x 10^3mL) f)(572.3g + 794.1g) divided

234. ## Atmospheric Science

1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth

235. ## math

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution

236. ## math

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island

237. ## math

writing to explain explain how to subtract 7.6 from 20.39

238. ## Math

the best order-of-magnitude estimate for 0.00006? - 10^-3 - 10^-4 - 10^-5 * my answer - 10^-6 the best order-of-magnitude estimate for 789,000? - 10^7 - 10^6 - 10^5 - 10^4 *my answer I don't understand this quite well but I want to make sure my answers are

239. ## math

A cement block accidentally falls from rest from the ledge of a 51.6 -m-high building. When the block is 15.7 m above the ground, a man, 1.90 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to

asked by mikaa johburg
240. ## Geography

Think of compass rose as a clock with north at 12 o'clock. what would the direction and bearing of the hour hand be at a) 3 o'clock b) 6 o'clock c) 9 o'clock d) 10:30 Please help. Thanks

241. ## Physics

A military jet is flying with uniform motion at 9.3*10^2 m/s[S], the magnitude of which is approximately Mach 2.7. At time zero, it passes a mountain top, which is used as the reference point for this question. a)Construct a table showing the plane's

242. ## physics

4 same conductor balls with charge q = 40 ìC and mass m = 30g mare located at the corners of a square a = 30cm. Now let the charged ball move freely from the initial position. What the final speed the ball can reach?

243. ## math

solve v=1/3TTr2h; h

244. ## Math

Katie cut out a piece of wrapping paper that was 2 times as long and 3 times as wide as the box that she was wrapping.The box was 5 inches long and 4 inches wide.What is the perimeter of the wrapping paper that Katie cut?

asked by Amy NGO
245. ## physics

2 point charges are located at the coordinates in the figure, how much work needs to move a point charge q = ]20ƒÊC from B to A? link to photo dropbox/s/x93u73xu2zslfqj/Untitled.png?dl=0

246. ## Physics 1

A golf ball is struck with a five iron on level ground. It lands 92.0m away 4.20s later. What was (a) the direction and (b) the magnitude of the initial velocity? I have no idea how to go about using the information given to find the first part (A). Even

247. ## math

A motorboat left a harbor and traveled to an island at an average rate of 11 knots. The average speed on the return trip was 10 knots. If the total trip took 4.2 hours, how far is the harbor from the island?

248. ## math

How many liters of water should be evaporated from 110 liters of a 12% saline solution so that the solution that remains is a 20% saline solution?

249. ## English

I need help with diagramming sentences. How do you diagram "Bruno and Shmuel talk and share food"? Is it a compound sentence, or does it have two verbs in a single clause?

250. ## Math (2nd time posting this)!

the best order-of-magnitude estimate for 0.00006? - 10^-3 - 10^-4 - 10^-5 * my answer - 10^-6 the best order-of-magnitude estimate for 789,000? - 10^7 - 10^6 - 10^5 - 10^4 *my answer I don't understand this quite well but I want to make sure my answers are

251. ## Math

a number and its absolute value are equal. if you subtract 2 from the number, the new number and its absolute value are not equal. what do you know about the number? what is a possible number that satisfies these conditions?

252. ## physics

A truck driver slams on the brakes and the momentum of the truck changes from ‹ 53000, 0, 0 › kg · m/s to ‹ 27000, 0, 0 › kg · m/s in 3.3 seconds due to a constant force of the road on the wheels of car. As a vector, write the net force exerted

253. ## math

I'm a bit confused on the whole lesson on finding coordinates on a graph. With prime or double Prime, and with the shapes. if some can explain it to me in a easier way, that would be cool. Thanks! (sorry if I didn't explain my problem well enough)

254. ## physical science

a bowling ball loses .5kg x m/s momentum as it hits bowling pins. how much momentum do the pins gain? please help

255. ## physical science

what causes friction?

256. ## algebra

(x/5) - g= a for x

257. ## physics

a diver dives from the top of a 100m cliff. he begins his dive by jumping up with a velocity of 5m/s how long does it takes for him to hit the water below?

258. ## Music

What is the vertical line at the end of a measure called?

259. ## Physics

A light bulb is placed 21.7 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 4.60 cm closer to the mirror. Calculate the focal length of the concave mirror.

260. ## Physics

Consider a map oriented so that the x axis runs east–west (with east being the "positive" direction) and y runs north–south (with north "positive"). A person drives 14 km to the west, then turns and drives 44 km to the south. Find the magnitude and the

261. ## Science

Identify the dependent and independent variables in the following experiments. 1. Height of bean plants is recorded daily for 2 weeks. 2. Percent absorption by a pigment is measured for red, blue, green, and yellow wavelengths of light. My thought process:

262. ## Physics

Consider a map oriented so that the x-axis runs east-west (with east being the "positive" direction) and y runs north-south (with north "positive"). A person drives 23 km to the north, turns and drives 76 km to the east, and then turns north and drives for