# grace

Popular questions and responses by grace
1. ## math

Given: ∆PQR, m∠R = 90° m∠PQR = 75° M ∈ PR , MP = 18 m∠MQR = 60° Find: RQ

2. ## Statistics

Suppose a basketball player is an excellent free throw shooter and makes 90% of his free throws (i.e., he has a 90% chance of making a single free throw). Assume that free throw shots are independent of one another. Suppose this player gets to shoot three

3. ## Statistics

A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. If sample proportion, P^, is

4. ## English

italicized word in which of the following sentences is a correct adverb form? 1.After falling during a race three weeks ago, Diane is finally well. 2.The whole class earned a good grade. 3.The runners all finished well. 4.I feel good about the decision.

5. ## CHEMISTRY

The specific heat capacity (cp) of lead is 0.13 J/g °C. How much heat (in J) is required to raise the temperature of 15 grams of lead from 22 °C to 37 °C? a. 2.0 b. -0.13 c. 0.13 d. 29

6. ## Physics

A 20g bullet moving at 200m/s hots a bag of sand and comes to rest in 0.011s. What is the momentum of the bullet just before hitting the bag? Find the average force that stopped the bullet

7. ## Trigonometry

How do I find all solutions to: tanx+3cotx=4? The answer choices are: a.) x=arctan3+nPi b.) x=arccot3+nPi

8. ## Operations Management

Consider the following system: -> 0.73 -> 0.73 -> Determine the probability that the system will operate under each of these conditions: (Round your final answers to 4 decimal places, not your intermediate calculations.) a.) The system as shown b.) Each

9. ## Chem

Write the formulas of the compounds formed by Pb4+ with the following anions: CN−, ClO3−, SO42−, H2PO4−.

10. ## history

Which best describes how Sparta’s culture influenced the city-state’s government? A- Sparta was a society based on exploration and expansion, and its government was also based on this concept. B- Sparta was a society based on being prepared for war,

11. ## Math - for Reiny

Mandy finds she can get a discount on corn cobs if she buys in bulk. She can get 100 kilograms of corn cobs for \$160 from Matt, on condition that she buys at least 100 kilograms. From another supplier, Robert, she can buy small quantities of corn cobs (100

12. ## math

Without using a calculator, choose (a) the larger of cos 40 and cos 50; (b) the larger of sin 40 and sin 50. Be prepared to explain your reasoning.

13. ## Physics

Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat

14. ## physics

Two large horizontal metal plates are separated by 4mm. The lower plate is at a potential of (-)6v.What potential should be applied to the upper plate to create field strength of 4000v/m upwards in the space between the

15. ## Chemistry

FeSCN2+ -> Fe3+ + SCN- Solution is initially dark red. If some Ag+ is added to form AgSCN. what happens to position of equilibrium? what happens ot the color?

16. ## Physics

A spiral spring of natural length of 20.0cm has a scale pan hanging freely on its lower end. When an object of mass 40g is placed in a pan. It length become 21.80cm when another object of mass 60g is placed in the pan the length becomes 22.05cm . Calculate

17. ## math

third degree with zeros of 2-i,2+i and 2 and a leading coefficient of 4. Construct a polynomial function with stated properties

18. ## chemistry

when aqueous solutions of copper II nitrate and sodium phosphate are mixed, sodium nitrate and copper II phosphate are formed. In the balanced chemical equation what is the coefficient of sodium nitrate?

19. ## Physics

Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What

20. ## riddle

Its new and old at the same time

21. ## chemistry

8.What is the mass of 4.56 moles of sulfur dioxide? 9.What is the mass of 4.56 molecules of sulfur dioxide? 10.How many formula units are in 0.456 grams of Ca3(PO4)2? 11.How many moles are in 1.5 x 10 ^23 atoms of fluorine? 12.What is the mass of 2.80 x 10

22. ## Chemistry

How do I do the empirical formula for 37.01% carbon, 2.22% hydrogen, 18.50% nitrogen, and 42.27% oxygen? My teacher gave me the answer (C7H5N3O6), but I can never get that answer.

23. ## Physics

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 29 degrees, the crate begins to slide downward. What is the coefficient of static friction between the crate and the ramp? At what angle does the

24. ## MATH

A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents.If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence interval of the true mean.

25. ## AP Human Geography

Without a scale on a map, A. many details must be omitted. B. only global trends can be captured. C. regional details can be captured, but larger details must be omitted. D. viewers cannot tell how much area on Earth is represented on the map. E. viewers

26. ## math

Water is being poured into a conical cup that is 12cm tall. a) When the water in the cup is 9cm deep, what percentage of the cup is filled? b) When the cup is 75 percent filled, how deep is the water?

27. ## math

Given: ∆PQR, m∠R = 90° m∠PQR = 75° M ∈ PR , MP = 18 m∠MQR = 60° Find: RQ M is on segment PR 9sqrt3 is wrong(the system did not take it)

28. ## MATH

if 5 times a certain integer ìs subtracted from twice the square of the integer the result is 63. find the integer

29. ## Chemistry

What is the Wavelength( in nm) of the least energetic spectral line in the infrared series of the H atom? I don't understand how to find the least energetic spectral line?

30. ## Physics

Two cars travel westward along a straight highway, one at a constant velocity of 85 km/hr, and the other at a constant velocity of 115 km/hr. a) Sketch the velocity vs. time graph for both cars and paste your sketch in the space below. b) Assuming both

31. ## Geography

Which scenario accurately depicts a way that maps are used as a reference tool? A. A shopper consults a map to discern the best route to a new store. B. A teacher displays a map to point out the name of a local mountain. C. A student consults a map to

32. ## world history

What was a major cause for the Third Italian War of Independence? the border disputes with France and later with Prussia the simultaneous attack of Austria by Prussia and Italy in 1866 the desire to create a vast Italian empire in central Europe C?

33. ## MATH AGAIN

Given: ∆ABC is isosceles m∠ACB = 120° m∠BMC = 60° CM = 12 Find: AB M is on line segment AB

34. ## math

Given: ∆ABC is isosceles m∠ACB = 120° m∠BMC = 60° CM = 12 Find: AB M is on line segment PR

35. ## Physics

A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the

36. ## Physics

A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

37. ## Language Arts

What does the word conviction mean in this sentence? His voice rang with great conviction as he told us his ideas. A)Anger B)Certainty C)Confusion D)Sorrow

38. ## langauge arts

What is the best way to rewrite the following topic to form a focused thesis statement? Electric cars vs. Cars fueled with gasoline A. Cars fueled with gasoline shouldn't be allowed on the road, especially when electric cars are so readily available. B.

39. ## Math

You flip a coin 30 times and get heads 11 times, so the chance of getting heads is 11\30. Is this an example of theoretical or experimental probability? A. Theoretical B. Experimental Is the answer B? Thank you

40. ## physics

A block with initial velocity of 3 m/s slides 9m across a rough horizontal surface before coming to rest. What is the coefficient of kinetic friction? V^2=Vo^2+2ax 0=9+18x a=-1/2 Ffr=mukFn Sigma F=ma ma=mukFn

41. ## Math

A lighthouse is east of a Coast Guard patrol boat. The Coast Guard station is 20 km north of the lighthouse. The radar officer aboard the boat measures the angle between the lighthouse and the station to be 23°. How far is the boat from the station?

42. ## Science

1.If an animal is an ectotherm, It has? A. A skeleton on the outside of its body B. A skeleton on the inside of its body C. A body that regulates its own internal temperature D. A body that does not produce much internal heat

43. ## math

Graph the equation y = 1 + 2 sin x. This curve crosses the x-axis in several places. Identify all the x-intercepts with 0 < x < 360.

44. ## Algebra

Tire pressure is directly proportional to temp on a temp scale where zero degrees is absolute zero. given that temp in degrees celcius and degrees Fahrenheit are related by the formula F=9/5C +32 and absolute zero is -273.15C, by what % does tire pressure

45. ## Math

HELP A Certain state's lottery LOTTO, is set up so that each player pays \$1 per ticket and chooses six different numbers from 1 to 49. if the six numbers chosen match the six numbers drawn each Saturday evening, the player wins the top cash prize. the

46. ## Math

If a line L with a slope of -2/5 passes through the points (5,0) and (x,-2) then what is the value of x?

47. ## Math

If Jack's house is 7.1 miles due north of the Senior Citizen Center and Belinda's house is 6.3 miles due west of it, then to the nearest tenth,what is the shortest distance between their houses?

48. ## physics

What is force of attraction between two students of mass 20kg,10meters apart?

49. ## Physics

An engineer is designing a runway for an airport. Several planes will use the runway and the engineer must design it so that it is long enough for the largest planes to become airborne before the runway ends. The largest plane accelerates at 3.30 m/s2 and

50. ## science

If a 50kg cheeetah had kinetic energy of 18,000 joules , how fast is the cheetah running?

51. ## math

what is the mean median and mode of 13, 11, 16, 12, 42, 8

52. ## math

Sasha has 8 red apples. She has 3 fewer green apples than red apples. How many apples does she have? 13 apples 8-3=5 green 8+5=13

53. ## History

were the reformation and counter-reformation popular movements of the carefully orchestrated manipulations of charismatic figures or both? Why?

54. ## Math

What is the distributive property of (5*600)+(5*400)?

55. ## math

On a standard six-faced die,the numbers of the opposite faces always add to seven,Dena rolls a pair of fair,standard six-faced dice.She then takes the product of four numbers ,the two numbers on the faces that are showing on top of the dice and the two

56. ## St paul's university

A sample of 200 voters revealed the following about the three candidates A,B and C.28 were in favour of both A and B.98 in favour of A or B but not C.42 in favour of B but not C or A.122 in favour of B or C but not A.64 in favour of C but not A or B.14 in

Quadrilateral WXYZ os describes below. Line segment WX is parallel to line segment YZ. Line segment XY is the same length as line segment ZW. Line segment Xy is not parallel to line segment ZW. Which of the following describes quadrilateral WXYZ? A.

58. ## Psychology

Help me create a mnemonic device to remember the Four Basic Units of Language: Phonemes, Morphemes, Syntax, and Semantics

59. ## math

explain how you could use 5x6=30 to find the product of 6x6

60. ## Chemistry

Write a balanced chemical equation that represents the self-ionization of water. (Use the lowest possible coefficients. Include states-of-matter at 1 atm and 25°C in your answer.)

61. ## Chemistry

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?

62. ## chemistry

what is the total heat lost if you have 8 grams of copper and the temperature changed from 43°C to 36°C

63. ## Physics

A uniform ladder of 5.0 m long and 12 kg is leaning against the wall (contact with the wall = point b, contact with the floor = point a). The height from the ground to point b is 4m . The wall is frictionless but the floor is not. A painter of 55 kg climbs

64. ## Algebra

Task Type: Individual Project Deliverable Length: 3 Parts: See Assignment Details Points Possible: 150 Due Date: 11/5/2012 11:59:59 PM CT Weekly tasks or assignments (Individual or Group Projects) will be due by Monday and late submissions will be assigned

65. ## Math

Brian rode his motorbike for 3 hours at 50 miles per hour and then rode the next 200 miles in 5 hours.What is the total distance he traveled? a)150 b)190 c)250 d)350 e)1150

66. ## math

A certain printer can print at the rate of 80 characters per sound, and there is an average of 2,400 characters per page.If the printer continued to print at this rate, how many minutes would it take to print an M-page report? a) m/30 b) m/60 c) m/2 d) 2/m

67. ## Math

To the nearest tenth,what is the circumference of a circle with an area of 49pi?

68. ## Pre algebra

How do I solve Quadratic equations by factoring? (for example how would I solve n2 - 10n = -21 if I was supposed to get the answers 7 and 3?

69. ## Chemistry

Are hybridized orbitals used to explain the fact that the four bonds in methane are equivalent? If not, what is?

70. ## Math

Solve: ((10)/(x^2-3x+45))=x+1

71. ## chemistry thank you

concentrated sulfuric acid has a density of 1.84 g/ml. calculate the mass in grams of 1.00 liter of this acid

72. ## Chemistry

Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. a) The C---O bond absorbs radiation of wavelength 9.6um. What frequency (in s-1) corresponds to that wavelength? b) The H---Cl bond has a frequency of

73. ## math

Suburban Population. The following charts show the populations for two suburbs from 1980 to 1990, where x = 0 correspond to 1980, x = 2 correspond to 1982, and so on. Year x Suburb 1 y Year x Suburb 2 y 0 12,690 0 23,112 2 12,071 2 23,893 4 13,463 4 24,674

74. ## chemistry

Which of the following statements are true? Fusion reactions result in nuclei with higher Z. To keep a nuclear power plant going, a chain reaction must be maintained. Nuclear fusion produces no long-lived radioactive by-products. The Sun is a nuclear

75. ## Chemistry

The boiling ponit of phophine is -85 oC, whilst of ammonia in the same group is -33.5 oC, how can we account for this difference in BP?

76. ## Calculus

The number of bacteria in a culture increases exponentially with a growth constant of .2 hour. How long will it take for the population to increase from 3000 to 25,000? Thank you for any help you can give and for your time!

77. ## Geography

This is the least mountainous country of Southern Europe. 1) Greece 2) Italy 3) Portugal 4) Spain in my book, it says all of them are mountainous. help?

78. ## chemistry

what is observeed when carbon dioxide was bubbled into bromothymol blue? a. the color of the solution changed from greenish to yellow color. b. the solution turned cloudy c. the color of the solution changed from yellow to colorless d. a precipitate formed

79. ## CHEMISTRY

which one of the following reactions represents the balanced chemical equation for the formation of water from hydrogen gas and oxygen gas? a. 2H(g) + O(g) a H2O(I) b. H2(g) +o(g) a H2O(I) c. 2 H2(g) + O2(g) a 2 H2O(I) d. 2 H(g) + 1/2 O2(g) a H2O(I)

80. ## Physics

Suppose at a concert a singers voice is radio broadcast all the way around the world before reaching the radio you hold to your ear . How long does this take . __ seconds I don't understand thisss ! Help me !

81. ## maths (2nd time)

Solve the equation. Round to the nearest hundredth: 1. 1.59x+4.23=3.56x+2.12 2. -3(1.25-2.48x)=8.15+5.86

82. ## algebra

please help! For each function, give one zero. Most of the functions have more than one zero, but just pick one. Function: y=(x-4)(x+6) -6 5 none -2 -1 1 4 which one of those would fit for the equation? I think it's 4 but I'm really struggling here. Can

83. ## math

The angle of elevation of the top of a flagpole is 64 degrees from a point 32m away from the foot of the flagpole.Find the angle of elevation of a flag halfway up the flagpole from the point correct to the nearest degree.

84. ## Maths

What is the 50th time of the linear sequence below 27, 25, 23, 21, 19

85. ## Geometry

What is the scale factor of a dilation centered at the origin that maps the point (12, -8) to the point (-7.2, 4.8)?

86. ## Geometry

What is the scale factor of a dilation centered at the origin that maps the point (12, -8) to the point (-7.2, 4.8)? Please show work as it will help me better understand, thanks so much!

87. ## L O

Six reason for human Rights violation

88. ## Computer Science

The compare_and_swap() instruction (CAS) can be used to design lock-free data structures such as stacks, queues, and lists. The program example shown below presents a possible solution to a lock-free stack using CAS instructions, where the stack is

89. ## Help! Communication

HELP!!! effective verbal message formation is about being. 1) Supportive of others 2) Critical of the motives of others 3) informed about a decision process 4) intentional in one's learning. I think the answer is 2 but i'm not sure.

90. ## MATH

IF FENCING IS \$12 A METRE HOW MUCH WILL A FENCE COST

91. ## Mathematics

If we require a margin of error of x% for the sample size n, express n in terms of x.

92. ## math

a respie requires 2 cups of flour to make 10 servings and 8 cups of flour to make 40 servings. How many cups of flour are needed to make 30 servings

93. ## Math

Does expressing a number in scientific notation change the value of the number (being expressed)?

94. ## Math

The temperature is 12 degrees lower that 4 hours ago. Write an integer equation for the situation and what is the average temperature change per hour? 12/4= 3 3 degrees is the average temperature change per hour.

95. ## science

which of the following does not change when a car keeps a constant speed but changes direction

96. ## Chemistry

Suppose a saturated solution of barium fluoride contains 1.5 x 10 ^ -2 M of F-. What is the Ksp of BaF2. I know that the balanced equation of this reaction is: BaF2 (s) --> Ba2+ (aq) + 2F- (aq) There is a 1:1 ratio between BaF2 and Ba2+ and there is a 1:2

97. ## math

What is the volume of the cone in the picture if S = 5 and R = 3?

98. ## chemistry

A 7.30-L container holds a mixture of two gases at 45 °C. The partial pressures of gas A and gas B, respectively, are 0.410 atm and 0.620 atm. If 0.150 mol of a third gas is added with no change in volume or temperature, what will the total pressure