# Sierra

Popular questions and responses by Sierra
1. ## trig

How do you find the exact value of sin 5pi/8?

2. ## Math

The country hall charges a rental fee of \$1000 and at least \$3000 for food. Olivi is planning a class reunion. If she had chosen a buffet that costs \$38.56 per person what is the minimum possible number of people who must attend to support the expense?

3. ## Earth Space Science

the horizontal distance between a crest to the next trough of an ocean wave is 5 meters. what is the wavelength of the ocean wave? A)2 meters B)5 meters C)10 meters D)20 meters I think its 10 meters but im not so sure, I would like to make sure.

4. ## Math

In the rhombus, angle 1=15x, angle 2=x+y, and angle 3=30z. Find the value of each variable.

5. ## algebra 2

Let f(x)=5x^3-2x and g(x)=3x^3.Preform the operation given and state the domain. A. F(x)+ g(x) B. F(x) - g(x) C. F(x) • g(x) D. F(x) / g(x) E. f(g(x)) F. g (f(x)

6. ## American Government

Which statement does NOT characterize Martin Luther King Jr.'s "I Have a Dream" speech? 1.)It openly criticized the Governor of Alabama 2.)It supported the peaceful congregation of peoples of all races and religions 3.)It pointed out racial problems in the

7. ## physics

The 2 kg block in Figure 7-25 slides down a frictionless curved ramp, starting from rest at a height of h = 3 m. The block then slides d = 12 m on a rough horizontal surface before coming to rest. Figure 7-25 (a) What is the speed of the block at the

8. ## Geometry

The vertices of a triangle are P(-3,8), Q(-6, -4), and R (1, 1). Name the vertices of R (smaller letters)y-0 (triangle PQR). A. P'(-3, 8), Q'(-6,-4), R'(1,1) B. P'(-3,-8), Q'(-6,4), R'(1,-1) C. P'(3,-8), Q'(6,4), R'(-1,-1) D. P' (3,8), Q'(6,-4), R'(-1,1)

9. ## Math

Line DF bisects angle EDG. Find the value of x. Line EF has 9x+114. Line FO has 15x. angle FDG has 32 degrees.

10. ## Physics

If you combine 34 kg of ice at 0°C with 80 kg of steam at 100°C, what is the final temperature of the system? °C

11. ## History

Explain the different functions of the aerospace centers in Houston and Cape Canaveral. I think this is the answer, can somebody please double check it. ***In Houston, Texas, the Lyndon B. Johnson Space Center is a place where visitors can see the history

12. ## History

What were the Civilization Regulations of 1880 designed to do? A. Outlaw practices regarded as civilized by European American settlers B. Outlaw European American expressions of spirituality and cultural practices C. Provide guidelines for civilized forms

13. ## Math

Each human hand has 27 bones. There are 6 more bones in the fingers than in the wrist. There are 3 fewer bones in the palm than in the wrist. How many bones are in each part of the wrist?

14. ## chemistry

25. Which of the two reactions, A or B is a neutralization reaction? Explain why. A. HBr + H2O = Br- = H3O+ B. HClO + NaOH = NaClO + H2O 26. A. Look at the reaction again. when this reaction is reversed. Br- + H3O+ = HBr = H2O what substance is the acid,

15. ## Physics

Electrons on a radio broadcasting tower are forced to oscillate up and down an antenna 535,000 times each second. Show that the wavelength of the radio waves that are produced is 561 m.

16. ## Physics

a quaterback throws a ball to a stationary reciver wo is 15.2m down the feild. the football is thrown at an initial angle of 42 dagrees. acceleration is 9.81m/s^2. what is the initial speed that quaterback must throw the ball to hit the reciver?

17. ## diagramming a sentence

In this sentence, "Yellowstone National Park is in Wyoming", is the word "in" the present tense verb?

18. ## english

in line 16of "The Nymph's reply to the shepherd" in what ways does the speaker's word choice reveal a striking balance of opposite to illustrate the theme of the harmful effects of time?

19. ## calculus

The operating cost, C, in dollars per hour, for an airplane cruising at a height of h metres and an air speed of 200km/h is given by: C = 4000 + h/15 + 15000000/h for the domain 1000 ≤ h ≤ 20000. Determine the height at which the operating cost is at a

The sum of an integer and the next greater integer is at the most 13. Write an inequality to find the lesser integer and solve for the lesser integer. My answer n+n+1

21. ## chemistry

Hemoglobin is the oxygen carrying molecule of red bloods and contains 4 atoms of iron per molecule of hemoglobin. A sample of hemoglobin weighing 13.4 g contains 45.6 mg iron. What is the molecular mass of hemoglobin? I'm unsure of where to begin with this

22. ## physical science

what is the density of a peice of wood that has a mass of 25.0 grams and a volume of 29.4cm cubes?

23. ## Physics

The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only one-fifth of your weight on the ground. What is the speed of the roller coaster?

24. ## Chemistry

aqueous sulfurous acid H2SO3 was made by dissolving 0.200 L of sulfur dioxide gas at 19 C and 745 mm Hg in water to yield 500.0 ml of solution. the acid solution required 12.9 ml of sodium hydroxide solution to reach the titration end point. what was the

25. ## physics 11

brutus, a champion weightlifter, raises 240 kg a distance of 2.35 m. How much work is done by Brutus lifting the weights?

26. ## math

find the missing numbers 1562 ----- ----- ---- ------ ----- 1874. they are number lines

27. ## math

find the numbers 2493 ----- ------ ----- ----- 8008

28. ## Geometry

If two lines are cut by a transversal in such a way that alternate interior angles are congruent, then the lines are parallel. Given: Use the lines and angles numbering system shown on page 156 in your online textbook. Alternate interior angles ∠3 and

29. ## math

what is 7-y-y=-1 equal to?

30. ## geography

the c0orn belt of the united states stretches from Ohio to Nebraska.

31. ## Algebra

I have 6 bags with the same number of cookies. Altogether I have 36 cookies.The equation to find out how many cookies are in each bag is 4*c=36. Why is this wrong?

32. ## Art

what value is most likely encouraged when citizens look at the rising eagle on the unit state dollar bill? Wisdom Patriotism Endurance Creativity I think either wisdom or patriotism

33. ## Chemistry

what volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

34. ## chemistry

Experimentally the ionization energy of hydrogen is 1312.2 kJ / mol. What would be the wavelength (nm) of a photon with enough energy to ionize one atom of hydrogen? They give the equation E=hcR but those are all known constant values and none include mols

35. ## chemistry

Please identify the acid and the base in this equation. HClO + NaOH = NaClO + H2O Thank you!

39. Explain why sweating cools you down in terms of molecular kinetic energy. 40. You take a pizza out of the oven and let it cool briefly. When you bite into it, the crust is not too hot but the cheese burns your mouth. Explain why this happens in terms

38. ## Physics, help!

A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage) An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at

39. ## math

write a number and a fraction greater than 1 that name the part filled

40. ## Physics

A rectangular aluminum plate has an area of 0.41 m2 at 23°C. If it is heated until its area has increased by 4.4 10-6 m2, what is the final temperature of the plate? °C

41. ## Physics

An ice cube of volume 17.7 cm3 is initially at a temperature of -19.3°C. How much heat is required to convert this ice cube into steam?

42. ## trig

Solve the equation on the interval [0,360) cos^2t+2cos(t)+1=0

43. ## Physics

A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.

44. ## social studies

6. Stabilization policies can best be described as policies that: A. attempt to eliminate recession and/or inflation in the economy. B. use changes in government spending to promote an equitable income distribution. C. use changes in the money supply to

45. ## Math

what is 12 to the 2nd power?

46. ## Civics

Who is assigned to take care of diplomacy?

47. ## Physics

a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If specific heat of iron is 0.11 cal/G*c to what final temperature will the iron bar cool?

48. ## Physics

a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If specific heat of iron is 0.11 cal/G*c to what final temperature will the iron bar cool?

Need help... equivalent decimal for 214% =.214right? percentage 7 1/2% of 120 = 9% percent 15 is what percent of 75 = ?

50. ## Geometry

Center & Radius of circle? (x+1)^2+(y+7)^2=36

51. ## Math

f two lines are cut by a transversal in such a way that alternate interior angles are congruent, then the lines are parallel. Given: Use the lines and angles numbering system shown on page 156 in your online textbook. Alternate interior angles ∠3 and

52. ## OK History

Please help ASAP!!! ***Describe how oklahoma's economy has become more diversified in the last 20 years. Cite specific non traditional industries that have come to the state. How has diversification helped the state?**** I was thinking that it would be

53. ## history

which region of mexico is the best for growing crops

54. ## Math

-2.2(1.1-6.6)

55. ## LA

what are two ways tock and humbug are differentin act 2 of the phantom tollbooth

56. ## algebra

graph y=/x/-2

57. ## math

7x + 5 8x + 9 find the value of x so that both the sum of the equations equal 180 when added together.

58. ## Algebra

I lined up all of my pet snakes. The two pythons are 6 feet each. I also have three corn snakes that are all the same length. Altogether, my snakes total 21 feet. A. How long is one of the corn snakes? B.Write an equation that models this situation. Thank

59. ## math

write an algebraic or numeric expression for the following:Take away 30 from j

60. ## Chemistry

Radium-223 has a half-life of 11.4 days. Approximately how long would it take for the activity of a sample of 223Ra to decrease to 2.00 % of its initial value?

61. ## Chemistry

What volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

62. ## Physics

you strike a huge spring at a speed of 30m/s while strapped in a steel cage. When you hit the spring with combined mass of 320kg it is compressed 9.0m. A) What is the spring constant of the spring? B) How long are you in contact with the spring before it

63. ## Physics

So you chose to use a solid sphere and you give it a speed of 5.9m/s on a flat horizontal surface which is the speed it has when it reaches a 22degree incline. A) How far along the incline will it go?

65. ## Language Arts

Choose the meaning that best matches the word in capitals: The president of the large company felt as if he had reached the PINNACLE of his career. A. lowest point B. pointed or towering formation C. highest point of achievement** D. rise toward success or

66. ## math

The property taxes on a business office were \$3000. What was the tax rate if the business office was valued at \$200,000?

67. ## Math

First year students at a particular college must take one English class, one class in mathematics, a first year seminar, and and elective. There are 2 English class to choose from, 3 mathematicss classes, 5 electives, and everyone takes the same first year

68. ## AP Chemistry

An ore contains Fe3O4 and no other iron. The iron in a 39.3-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10.6 g. What was the mass of Fe3O4 in the sample of ore? Answer in units of

69. ## Math 7

A photo studio offers different sized prints of the same subject. The original print measures 8 inches by 10 inches. A printer enlarges the orginal the orginal by a scale factor of 1.5, and then enlarges the second image by a scale factor of 3. What are

70. ## History

I am having a hard time with this question and where to look for the answer. How might the cultures of Latin America be different if the spanish and portugese never arrived? Also what kind of culture do you think would dominate today?thanks

71. ## Science

which of these statements provides evidence to the fact that oceans influence climate by transporting water from one place to another? A)warm ocean water off the east coast of Florida affects the climate of Europe. B)warm ocean water off the east coast of

72. ## Science

Salinity of the ocean A)is generally very low B)changes with climate C)decreases with increase in temperature D)increases where a river meets the ocean I think its A but I'm not sure I just want to make sure.

73. ## English

Hello, can you check with me to see if this answer is correct to this question. What does scrooge mean by these lines in a Christmas carol Act two scene four? Spirit this is a fearful place, in leaving it, I shall not leave its, lesson, Trust me let us go.

74. ## Statistics

A student guesses blindly on a 20-question multiple choice test. If each question has 4 answer choices (only one of which is correct), what is the probability that the student will answer exactly 10 questions correctly?

75. ## physics

A horizontal force of 150 N is used to push a 45.0-kg packing crate a distance of 5.75 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic

76. ## algebra

A school has a classroom with a length eight feet less than twice the width. If a group of parents purchased 400 square feet of carpet for the room, what is the approximate length of the room? L=2W-8 L*W=400 (2W-8)W=400 2w^2-8w=400

77. ## College Algebra

Allison drove home at 65 mph, but her brother Austin, who left at the same time, could drive at only 41 mph. When Allison arrived, Austin still had 144 miles to go. How far did Allison drive?

78. ## Math

A true crab has 4 fewer than twice the number of legs that a hermit crab has. The hermit crab has 6 legs. How many legs does the true crab have? I put for the equation 4c =6 *2 I am confused

79. ## Math

An annual pass covering entrance fees to more than 2000 national parks cost \$80. If the total income from the annual passes is \$12,800 in one month. Write the equation and solve it. For my equation I put 12800p=80

80. ## Math

1400= 2/5x X= 7000 I took 1400 times 5

81. ## Math

Which expression represents the difference of (3y+2)-(y-1)? I put 2y+ 3 for my answer.

82. ## Chemistry

find the mass in grams of 1.40x10^23 molecules of n2

83. ## Chemistry

What is the mass of 1.00 mol of sodium hydrogen carbonate?

84. ## Chemistry

What is the percent by mass of hydrogen in aspirin C2H8O4?

85. ## chemistry

I just need a definitive answer because I've searched everywhere and it's made me second guess my original answer. How many valence electrons does copper have? I thought it was one but now I'm unsure. I know it's electron configuration is [Ar]4s1 3d10, so

86. ## History

What are some aspects of the modern American political party system that began during the Jackson era? A.beginnings of political action committees and fundraising B.widespread campaigns for the popular vote, including fliers, slogans, and songs C.of

87. ## physics

A circular curve of highway is designed for traffic moving at 93 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 110 m, what is the correct angle of banking of the road? (b) If the curve were not banked,

88. ## religion

who do members of the Jesuit Volunteer Corps work for?I need help,been stuck on this question for,like,15 minutes,I've been searching the internet for 20 minutes.

89. ## Chem

41. How much heat energy must you use to raise the temperature of 100 grams of water from 60C to 70C. Show your calculations. 42. You have a pot of 100C liquid water. If you add heat to the water, will the temperature start to raise at once? why or why

37. Lake Michigan is a very large, very deep body of water, located in a region of the United States that gets quite cold in winter. On the coldest day of last year, what was the temperature at the bottom of the lake. Explain your answer in terms of

91. ## Chemistry

B. Could non-polar nitrogen molecules and polar water molecules form bonds with one another? if so, what kind? C. Given your answer to B above, do you think that there is a great deal of N2 dissolved in the oceans, a small amount, or none at all?

92. ## math

3/4 of a gallon is 6/7 of the amount originally in the container. how much was in container originally

93. ## Math

In triangle ABC, m

94. ## Math

Write a rule in function notation to describe transformation that is a reflection across the x-axis. A. Ry-x(X,Y) B. Rx-0(X,Y) C. Rx-y(X,Y) D. Ry-0(X,Y)

96. ## Math

Line LM is the mid-segment of rectangle ABCD. AB=x+8, LM = 4x+3, and DC=243. What is the value of x?

97. ## Math

Line LM is the mid-segment of rectangle ABCD. AB=72 and DC=104. What is LM? A.176 b. 88 c.98 d.32

98. ## Geometry

What is an equation in point-slope form for the line perpendicular to y=2x+13 that contains (8,-4)?

99. ## Social Studies 10

"Was the conflict over the Red River Settlement inevitable? Provide reasons for your answer."