# sam

Newest questions and responses by sam
1. ## Math

In a certain class, percentage of students who increased their average grade during spring term compared to that of the fall term was recorded between 6.9% and 7.1%. What could be the least possible number of students in that class?

2. ## Math

The iMath college received big quantity of new iPads for all the college students and staff. Students tried to arrange all the iPads in the cabinet of shelves with slots of 80 iPads per shelf but one shelf remained with empty slots and it was not

3. ## Chemistry

Antifreeze protects a car from freezing and from overheating. Calculate the freezing-point depression of a solution containing exactly 100. g of ethylene glycol (C2H6O2) antifreeze in 0.500 kg of water. Kf of water is: -1.86 C/m.

4. ## math

I don't know where to start to figure this out. If someone could just give me clue I would appreciate it so much. Thank you Given the location of p on a number line and distance between p and q. Choose all that correctly give the location of q on the

5. ## Social Studies

The governmet of south Africa is a parliamentary democracy. What does this mean

6. ## Biology

In a certain species of rabbit, black fur is dominant to white fur. A male rabbit with black fur that is a heterozygote is crossed with a female rabbit with black fur, which is also a heterozygote. Using a Punnett square, show what the genotypes and

7. ## Math

Is 4/6 equal to 6/8 I say no. But just want a check on my answer

8. ## Algebra

Find two consecutive numbers if the square root of the smaller number is 3 less than the bigger number.

9. ## Math

In a parallelogram a diagonal of the length 20 cm is perpendicular to one of the sides. Find the longer side of parallelogram if its perimeter is 80 cm.

10. ## Algebra II

Consider the function y = 1/x. A. What happens to the value of the function as the value of x gets very large? My answer: the value of the function increases. B. For what value of x is the function undefined? Explain why. My answer: 0, because it is not

11. ## math

is the absolute value of -6 6?

12. ## math

At dinner one night Sean paid a total of \$54.32. The tax was 8%, and he left a 20% tip on the check and tax. Which equation can be used to find the amount of the check BEFORE tax and tip?

13. ## chemistry

The volume of a sample of a gas at STP is 200.0 ml. If the pressure is increased to 4.00 atmospheres (temperature constant), what is the new volume?

14. ## Chemistry

If the volume of a gas @ STP is 300.0 ml, what is its volume at 25.0 C, assuming constant pressure?

15. ## math

A study was made of 200 preschoolers to determine if they watched some particular television shows. The choices were Little Galileo, Super Reader and Prehistoric Train. The results are I. 22 preschoolers did not watch any of these shows II. 73 preschoolers

16. ## Chemistry

A sample of hydrogen exerts a pressure of 0.418 atm at 57.0° C. The gas is heated to 88.0° C at constant volume. What will its new pressure be?

17. ## Chemistry

How many moles of oxygen gas must be in a 12.2 L container to exert a pressure of 0.877 atm at a temperature of 35.0°C (the ideal gas constant in this case is 0.0821 L atm / mole K)?

18. ## math

Find an equation in standard form for the hyperbola that satisfies the given conditions. Center at​ (0,0) a=4​, e=2​, horizontal focal axis

19. ## social studies

Which statement best describes the Louisiana Purchase?

20. ## math

use properties of rational numbers to multiply the following. 7/12 x 253/5 Im so confused

21. ## Math

Please help just get started Sarah went trick-or-treating for Halloween. Because of her braces, she could not eat of the candy she received since it was either sticky or chewy. Of the candy she could not eat, she gave 2/3 of it to her older brother Bradley

22. ## Science

How do the traits of offspring of asexually reproducing organisms compare to their parents

23. ## math

In a parallel circuit, ET = 240 V, R = 400 W, and XL = 300 W. What is P?

24. ## Algebra

Find x (4^x)=((3/4)x)+7 Thank you!

25. ## Physics

If a body is thrown straight upwards with an initial velocity of 40 m/s, how long would it take to reach its maximum height? (Use g = 10 m/s/s for a falling body.) a.) 400 s b.) .25 s c.) 4 s d.) 40 s

26. ## Physics

A car has a constant acceleration of 5 m/s/s. At some time it is traveling at 40 m/s. How fast will it be going, one second later? a.) 30 m/s b.) 40 m/s c.) 45 m/s d.) 200 m/s

27. ## Physics

If we neglect the effects of air friction, which would hit the ground first if dropped from rest, a 5 pound body or a 1 pound body?

28. ## Electrical theory

A series RL circuit contains two resistors and two inductors. The resistors are 27 W and 47 W. The inductors have inductive reactances of 50 W and 40 W. The applied voltage is 120 V. What is the voltage drop on the inductor that has 40 W of reactance?

29. ## Chemistry

Iron (III) Nitrate reacts with Sodium Carbonate to form a precipitate. Be sure to indicate oxidation states (charges on each ion) & the precipitate. Skeletal Equation: Ionic Equation: (assume all ions are aqueous, dissociated free ions) NET Ionic Equation:

30. ## science

1.List the types of radiation emitted by the Sun.

31. ## Math

theres a new law that requires 15% of individuals income to be invested in the stock market your account shows that you need to put \$435 in the stock market how much did you earn this year A.\$2,955.00 B. \$9,900.00 C. \$2,905.00 D. \$2,889.50

32. ## Math

What ratios form a proportion. Use equivalent ratios to test each pair 1. 4/9 , 2/3 2. 6/15 , 9/12 3. 12/16 , 15/20 4. 18/20 , 24/30

33. ## Math

Two water pumps are filling a pool. One of the pumps is high power and can fill the pool 5 hours before the other can do. However, they both working together can fill half of the pool in 3 hours. In how many hours the high power pump can fill the pool?

34. ## Math

An equilateral trapezoid ABCD with height 2 units has all its vertices on the parabola y=a(x+1)(x−5). What is the value of a, if points A and D belong to the x−axis and m∠BAD=30o?

35. ## Math

The temperature in degrees Celsius (C) can be converted to degrees Fahrenheit (F) using the formula F(C)= 9/5 C+k, where k is a constant. Find k, if to C=−40ºC corresponds F=−40ºF.

36. ## Social Studies

How were the ideas of Enlightenment thinkers influenced by the Scientific Revolution?

37. ## Algebra

Find 5 consecutive whole numbers if it is known that the sum of the squares of the first 3 numbers is equal to the sum of the squares of the last 2 numbers.

38. ## Social Studies

Which of the following technologies required the measurement of the stars for navigation? A. compass** B. lateen C. Mercator projection D. astrolabe

39. ## chem

in the balanced equation ,cs2+3o2 co2 +2so2 , how many moles of would react with 34.5 mols of ?

40. ## Algebra 2

1.What is the vertex from the equation? Y=x^2+12x=4 (Please show your work to show me the steps to get to the right answer.) 2. Use the quadratic formula to solve the equation. x^2-7x-6=0 (Please show your work to show me the steps to get to the right

41. ## Social Studies

Between 1860 and 1914, what was the destination of 90 percent of European emigrants?

A farmer planned to plant 120 seeds in all. After planting 10 more seeds each day than was planned, she was able to finish 2 days earlier. How many seeds were planted each day?

43. ## math

The area of a trapezoid may be determined by using the formula A = (h/2)(a+b), where "A" stands for area, "h" stands for the height of the trapezoid, and "a" and "b" stand for the lengths of the bases of the trapezoid. If the height of the trapezoid is12

44. ## Math

At the Bay of Fundy, the difference between high and low tide is 8m and the time between high tides is 12 hours. At midnight, the water is at high tide. Write a sine function that models the water level over time t.

45. ## Algebra

The members of set A are the integer solutions of the inequality 2x−5≤11 and the members of set B are the integer solutions of the inequality −2x+7≤−9. What is one member of the intersection of A and B?

46. ## Physics - Compton Scattering

X rays of wavelength 0.0166 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. For Compton scattering from one of those electrons, at an angle of 169°, what are (a) the Compton shift, (b) the

47. ## Science

1. The air temperature is 10°C and the air contains 2.87 grams of water vapor. What is the relative humidity? Saturation mixing ratio of air parcel at 10°C is 7g/kg 2.87 / 7 x 100% = 41% 2. If the temperature of the air parcel in question 11 drops 10°C,

48. ## Science

As the air cools below the dew point temperature, the excess water left the air parcel via (condensation, evaporation). Is the answer condensation?

49. ## science

The compound adrenaline contains 56.79% C, 6.56%H, 8.28% N, and 28.37% O by mass. Assuming 100 g of adrenaline, how many moles of carbon are present?

50. ## Maths need help asap

How can I factor these [2a³c-2a³b+2ab³-2b³c+2bc³-2ac³]

51. ## math

The sum of 16 and Janelle's age is 53

52. ## mathematics

if f(x) = 16^x/(16^x + 4) find f(1/2017) + f(2/2017) +f(3/2017) + ...+ f(2016/2017)

53. ## us history

In response to which acts did colonial opposition become violent? stamp act sugar act townshend act tea act

54. ## Renaissance and Protestant Reformation

Could somebody please tell me at least 15 noteworthy events from the Renaissance and the protestant Reformation or maybe good links that I could look at? -Sam

55. ## physics

A tennis ball attached to the end of a light string hangs inside a car traveling on a circular track at 4.7 m/s. What is the radius of the circular track if the string makes a 10° angle with the vertical direction?

56. ## Physics

Just before a bouncy ball hits a wall, it is traveling parallel to the ground at 18 m/s, and it then bounces directly backwards at 17 m/s. The interaction time with the wall was 0.40 ms (4.0 x 10-4 s). If the ball's mass is 0.17 kg, what is the average

57. ## Geography

If the time at 10degree East is 11pm.what is the time in85degree West

58. ## Science

After an accident, a 60.0 kg Inuit girl finds herself at rest on the frictionless ice of a frozen lake, 15.0 m north of her stationary 150 kg sled. Fortunately she is connected to the sled by a rope of negligible mass, so she begins hauling the rope in,

59. ## science

Please someone answer this question for me .If you want to work in the lab what were you trying to demonstrate............... Thanks

60. ## Physics

Moving a magnet back and forth inside a coil of wire induces a current. How does the speed of the motion affect the magnitude of the current? Can someone please help me with this?? It would be much appreciate!! (=

61. ## Math

There are 10 egg sandwiches, 6 chicken sandwiches and 4 tuna sandwiches on a tray . A sandwich is randomly chosen. Find the probability an egg sandwich is chosen .

62. ## math

Two teams of workers were scheduled to produce 680 parts in a month. The first team produced 20% more parts than planned and the second team produced 15% more than planned. The two teams together produced 118 parts more than planned. How many parts was

63. ## Physics

Calculate how much energy is stored in a 17μF capacitor when it is charged to a potential difference of 200 V

64. ## Biology

How might large animals living in a group deal with a food shortage? A) by reproducing B) by shedding C) by migrating D) by fasting*** Pls help! Thank you! (=

65. ## Science

The molecular formula of first member of a certain group of organic compounds is CH2O(HCHO).Determine the name & molecular formula of third member of this group if it is in homologous series. What is the general name for this group of organic compounds?

66. ## Science

Al2O3 + 2NaOH = 2NaAlO2 +H2O What is the conclusion that you take about nature of aluminum oxide with help of equation.Give reasons for conclusions?

67. ## Math

If the length of a rectangle is decreased by 4 cm and the width is increased by 5 cm, the result will be a square, the area of which will be 40 cm2 greater than the area of the rectangle. Find the area of the rectangle.

68. ## math 11

If a truck travels at 120km to a warehouse with an empty truck. On the return trip, with a full truck, the truck driver travels 20 km slower. If the entire trip took 3.5 hours then determine his speed to the warehouse. IF the rate is 120 when leaving and

69. ## math 11

How much alfalfa should be added to 60L of ostrich pellets to create a mix that is 32% alfalfa by volume? I have no idea how to start this question. If I let x be the alfalfa and x+60 = 32 be the mix

70. ## Chemistry

If 102.6 g of K2SO3 are dissolved into 3.1 L of solution calculate the molar concentration PLEASE! help and and show the steps !! I’m trying to understand the process!

71. ## Math

The slope of a line passing through H (-2, 5) is -3/4. Which ordered pair represents a point on this line? a. (6, -1) b. (2, 8) c. (-5, 1) d. (1, 1) I think it's C. And it is NOT B by the way.

72. ## Maths

Experiments show that the concentration of substance X in a ﬁrst order chemical reaction at future time (in seconds) t i.e. [X] is described by the following diﬀerential equation: d[X]/ dt= .001[X], ﬁnd: (a) Find an expression for the concentration

73. ## algebra

It cost Mr. Andrews 200,000 dollars to build a house. He sold it to Ms. Bond at a 10 percent profit. Later Ms. Bond sold it to Mr. Cash at a 10 percent loss. What is the positive difference between the amount Ms. Bond bought the house for and the amount

74. ## Math

Becky and James have a total of 4 2\8 feet of yarn.Becky has 1 5\8 feet of yarn.how many feet of yarn does James have?

75. ## Math

A bag contains equal numbers of red, blue, and yellow marbles. A student chooses a marble at random. What is the relationship between the probability that the marble is red and the probability that the marble is not red? A) P(red) = P(not red) B) P(red) =

76. ## math

Find an equation for a line that contains (4, 9) and is perpendicular to the graph of y = 7x + 3/8 Answer choices 1. y = -1/7 x + 9 4/7 2. y = 7x - 15 3. y = 1/7x + 8 5/7

77. ## English

1. The best way to improve listening comprehension is to a. take informal notes on what you hear. b. use complete sentences to take detailed notes of both main ideas and details. c. concentrate on listening to the speaker's transitions. (B) 2.

78. ## Math

Replace ∗ with a monomial so that the trinomial may be represented by a square of a binomial: 36–12x + ∗, and 25a^2+ ∗ + .25 b^2

79. ## Math

Find the maximum value of the objective function z = 19x + 7y, subject to the following constraints. (See Example 2.) 3x + 2y â‰¤ 18 6x + 2y â‰¤ 30 â€‰ x â‰¥ 0, y â‰¥ 0

80. ## Finite Mathematics

Find the maximum and minimum value of the objective function given. z = 21x + 12y maximum value z = minimum value z =

81. ## aglebra 1

Use the following sequence of numbers to answer the questions that follow. 320, 80, 20, 5, …… Write the explicit equation for the given sequence. Answer choices 1. t(n+1) = t(n) * 0.25 2. t(n) = 320 * 0.25n 3. t(n) = 1280 * 0.25n

82. ## math

use the formula v=lwh to find the volume of a rectangular prism with the following dimensions: • length = 7 in. • width = 4 in. • length = 3 in. a. v = 14 in.3 b. v = 31 in.3 c. v = 49 in.3 d. v = 84 in.3

83. ## math

If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

84. ## Math

200 cans of food were distributed to 3 charity homes. 2/5 of the cans were given to the first home, 1/3 of the remainder to the second home and the rest to the third home. How many cans did the third home receive?

85. ## Spanish

in which of the following ways is the National Museum Fair in Costa Rica similar to International Museum Day in the United States?

86. ## Chemistry

Determine the molar concentration of ethanol (C2H6O) in a wine that is 14% ethanol by mass. The density of this wine is 0.93 g/cm^3.

87. ## Chemistry

Determine the molar concentration of ethanol (C2H6O) in a wine that is 14% ethanol by mass. The density of this wine is 0.93 g/cm^3.

88. ## physics

a piece of clay with a mass of 0.30 kg is tied to the end of a string 6.5 meters in length, and then whirled around in a horizontal circle at a speed of 6 m/s. a. what is the centripetal acceleration of the clay? b. what is the tension of the string?

89. ## Math

Daisy saved 4/5 of her salary. She gave 1/3 of the money she had saved to her mother. If she gave \$300 to her mother, what was her salary?

90. ## Englsih

Hey, can someone help me come up with examples for Aphorism speech plzzzz I came up with 3 I need 4 more!? "It is better to remain silent and be thought a fool than to speak out and remove all doubt" Here is the quote I am working on and it would be nice

91. ## Algebra

Find four consecutive natural numbers if you know that the product of the first two is 38 less than the product of the following two numbers.

92. ## Science

Give some examples of artifacts that are used to determine the geological history of the Earth, as well as how its life forms have changed over time. Is the question given and I don't really know any artifacts that are used for the geological history of

93. ## math

Judy spent 1/6 of her money on a pair of shoes and 2/5 of it on a bag. She then had \$26 left. a) What Fraction of her money did she have left? b) How much money did she have at first?

94. ## Calculus

Find the derivative of [(2+x)/(x-3)]^(2/5) I tried the power of a function rule, quotient rule, the chain rule but keep getting stuck.

95. ## math

You are making costumes for the school play. Each costume needs a piece of ribbon that is 5858 yard long. How many yards of ribbon are needed for the 2424 costumes?

96. ## Math

Lindsey read 2/5 of a book on Monday. She read 12 pages on Tuesday. If she still had 1/2 of the book to read, how many pages were therein the book?

97. ## Maths

A map has A scale of 1.25000.two towns are 15cm apart on the map.how far apart in real life ? answer in metres ?

98. ## Math

In order to compare to function to determine which has the greater output for the input 0, which characteristic of the function should be compared? a) rate of exchange b) slope c) x-intercept d) y-intercept is it the y-intercept?