# Crystal

Popular questions and responses by Crystal
1. ## math

how many ways can you make 75 cents with quarters, dimes, and nickels

2. ## math

Out of a pool of 234 people with lottery tickets, 120 of them are women, and out of those 120, 65 are older than 23, and out of those 65, 12 are married. What is the probability that the lottery winner will be a married woman older than 25? A. 2/39 B.

3. ## Chemistry

Nitrogen Monoxide reacts with hydrogen gas to form nitrogen gas and water (vapor). (i). write a balanced equation for this reaction. (ii). The reaction is experimentally found to be (approx) first-order in H2 and second order in in NO. Write the form if

4. ## Calculus

A piece of wire 24 m long is cut into two pieces. One piece is bent into a square and the other is bent into a circle. (Give your answers correct to two decimal places.) (a) How much wire should be used for the circle in order to maximize the total area?

5. ## music

what is a percusion insrument Percussion instruments are played by being struck, shaken, rubbed or scraped. They are perhaps the oldest form of musical instruments. Some percussion instruments play not only rhythm, but also melody and harmony.

6. ## miles

the Boggs family paid 49.75 for their car rental. how many miles did they drive? (p.s. it is based off the same question I sent before it)

7. ## pre-cal

find the constant c such that the denominator will divide evenly into the numerator x^4+10x^2+c/x+i

8. ## Math

The value of a car after it is purchased depreciates according to the formula v(n)=28000(0.875)^n where v(n) is the car's value in the nth year since it was purchased. How much value does it lose in its fifth year? The answer is \$2052 but I don't see how;

9. ## Math

Use the rated acute angle to state an equivalent expression Tan110 The answer is tan290. Why isn't it 70? Please explain

10. ## calculus

the edge of a cube is increasing at the rate of .05 centimeters per second. in terms of the side of the cube s, what is the rate of change of the volume of the cube, in cm^3/sec

11. ## Chemistry

Cl2+3F2 -> 2ClF3 how many grams of ClF3 form when .204 moles if F2 react with excess Cl2?

12. ## math 1025

find the interest. round to the nearest cent \$290 at 8.8% for 3 months

13. ## Dressmaking and Design

I need to see if my answers are correct on a couple of questions. 1. It's especially important to avoid stitching across the seam allowances when sewing a a. patch pocket with straight edges b. corner that has a seam c. point that has no seam d.

14. ## Physics

Twelve identical point charges are equally spaced around the circumference of a circle of radius 'R'. The circle is centered at the origin. One of the twelve charges, which happens to be on the positive axis, is now moved to the center of the circle. Part

15. ## Math

A farmer has 230 ft of fence to enclose a rectangular garden. What is the largest garden area that can be enclosed with the 230 ft of fence? Explain your work.

16. ## Poem: Incident in a rose garden: By Donald Justice

Could someone please check my answers to the poem thanks. 1. How does the gardener recongize Death? Answer: The gardener recognizes death as a dressed spanish waiter. 2. Why is the gardener afraid of Death? Answer: The gardener is afraid of death because

17. ## Math Help PLEASE !

Paul delivers newspapers. He charges \$2.25 per week for daily plus Sunday delivery, and \$1.00 per week for Sunday delivery only. Which expression below shoes how much Paul would collect in a week if he had 40 clients receiving daily plus Sunday delivery,

18. ## math/ unit rates

A fertilizer covers 5/8 square foot in 1/4 hour.

19. ## Math

For each geometric series, calculate t6 and S6. a) 6 + 30 + 150 ... So I'm not exactly looking for an answer to this question but I was wondering why they want you to find t6 too? Would finding out t6 (via general formula) help in any way when finding S6?

20. ## Chemistry

How do I write ZnSo4(aq)+Na3Po4(aq)---> Zn3(Po4)2(s)+Na2S04(aq)as a net ionic equation balanced?

21. ## physics

A meter stick lies on the bottom of a 100 cm long tank with its zero mark against the left edge. You look into the tank at an angle of θ = 24°, with your line of sight just grazing the upper left edge of the tank, and h = 32 cm. (a) What mark do you see

22. ## Chemistry

What is the enthalpy change (in kJ/mol) for the following process? Na+(g) + Br-(g) --> NaBr (s) Hint: use the Born-Haber cycle Note: the reference state for Br2 is Br2(l) not Br2(g) Data (in kJ/mol): enthalpy of sublimation of Na(s): 107 standard enthalpy

23. ## Physics

Physics Question Please Help? A wire, 20.0 m long, moves at 4.0 m/s perpendicularly through a magnetic field. An EMF of 40V is induced in the wire. What is strength of the magnetic field?

24. ## 6 th grade SS

Can you check my answer What do you think the political and economic future of Cyprus will be like? The future of Cyprus will be a future governed by a new and different governmental and political structure. Like focusing on the economy instead of the

25. ## Math

how did farmer john find his missing cow? How did the cow get over the block of hay?

26. ## college physics

A certain person's eye measures 24.0 mm from the pupil to retina. (a) If we treat the eye's lens as a thin lens, what is its focal length when the person focuses on a pencil 44.3 cm from the eye? (b) While the person focuses on the pencil, what is the

27. ## Math

Find an angle such that 3 times the complement of the angle is 10 degrees less than the supplement of the angle. I know that supplement means 180 and complement is 90. I don't know what kind of problem this is.

28. ## Poem: Annabel Lee by Edgar Allen Poe

Could you check these answers that go with the poem? Thanks 1. After reading "Annabel Lee," what images linger in your mind. Answer: The images that linger my mind are the kingdom by the sea, her grave by the sea, and the great love the two both shared. 2.

29. ## Accounting

Does anyone have any idea what the Acronym ADE / CLR stands for? Thanks for your help.

30. ## science

Written out, would the reaction between anihiline [C6H5NH2] and perchloric acid look like this: C6H5NH2 + HClO4 -> C6H5ClO4 + HNH2 ? The NH2 group on aniline is basic. It takes on a H^+ from HClO4 and forms the salt. The salt is C6H5NH3^+ + ClO4^-. I hope

31. ## Statistics

What are the grand mean, the UCL and the LCL of a control chart for the mean? Why do you suppose + (with underline) standard errors are used in control charts and not two standard errors or even one standard error?

32. ## pre-cal

Write a polynomial equation with integral coefficients that has 1/2 and 2i as solutions

Please explain: Ursula wrote the sum of 5.815 + 6.021 as a sum of two mixed numbers. What sum did she write? Compare the sum of the mixed numbers to the sum of the decimals? Please explain.

34. ## Math

104 students responses 21 liked sledding as their favorite winter activity if 500 people had. Responded, how many would have been expected to list sledding as their favorite winter activity? Round to the nearest whole person

35. ## Math

Determine the sum of the first seven terms of the geometric series in which ... F) t5 = 5 and t8 = -40 I'm stuck on this one!

36. ## Math

3) From two tracking stations A and B, 350 km apart, a UFO is sighted at C above AB making angle CAB = 32 degrees and angle CBA = 54 degrees. Find the height of the UFO. The answer is 150 km, please explain to me how 4) from a boat on the water, the angle

37. ## Chemistry

A mixture of C3H8 and C2H2 has a mass of 2.0g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. Find the mass of C2H2 in the original mixture.

38. ## accounting

If the cost of, C(x), for manufacturing x units of a certain product is given by C(x)=x2-70x+4400, find the number of units manufactured at a cost of \$7400?

39. ## Chemistry

Draw a reaction profile (diagram of energy vs reaction coordinate) for a hypothetical reaction AB +C A+BC in which the foward reaction has an activation energy of 100kJ mol-1 and the backward reaction has an activation energy of 75kJ mol-1. (ii). a

40. ## physics

A hair dryer uses 10A at 120V. It is used with a transformer in England, where the voltage is 240V. A. What should be the ratio of the turns of the transformer? B. What current will the hair dryer now draw?

41. ## Math

Find the equation of a line that is perpendicular to 3x-2y=6 and passes through (1,2)

42. ## Proofread my Critical Analyis essay

My critical Analysis essay is over the poem "Phenomenal Woman," by Maya Angelou. Before you begin reading it I've typed directions. When you finish it could you please give me a letter grade. I'm a 10th grader. Thanks so much have a blessed Thanksgiving.

43. ## Communication Theory

An objective theory is good in the eyes of an interpretive researcher if the explanation of communication behavior leads to further understanding of _________?

44. ## math

a rental car company charges a fixed fee of 30\$ plus \$0.05 per mile. let c represent the total cost of renting a car and driving it m miles. Write a equation that could be used to find the total cost of renting a car and driving it any number of miles.

45. ## science

A bus starts from rest and attains 40km/hr velocity after 10sec . Calculate the acceleration of bus in m/sec2

46. ## Mathematics

Marsha has \$60.00 . 2/3 of marsha's money is equal to 1/2 of Joanne's money .how much money does Joanne have ?

47. ## math

Determine whether the sequence is a Fibonacci-type sequence. If it is, determine the next two terms of the sequence. -4, 5, 1, -3, -2

48. ## Math

Hi(-: A newspaper editor wants to know whether people who buy the newspaper like the paper’s new format. He prints an alphabetical list of all the employee names and asks every fifth person on the list. Is the sample likely to be biased or unbiased?

49. ## HIS202

During the latter part of the 19th century, Republicans were particularly strong in the _____ states?

50. ## US History

Which of the following 19th century developments most undermined the racial philosophy John C. Calhoun Outlined in the excerpt from his 1848 Senate speech? A The establishment of the Ku Klux Klan B The enforcement of the black codes C. The suspension of

51. ## Chemistry

If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?

52. ## physics

A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.2 m/s. If the coefficient of friction between the sled's runners and snow is 0.060 and the boy and sled together weigh 480 N, how far does the sled travel on the

53. ## Chemistry

In the reaction 2H2O2(aq)-->2H2O2 + O2 (g), There is intially 0.865 M H2O2. After 10.0 minutes, the molarity of H2O2 changes to 0.792 M. What is the rate of reaction in terms of H2O2?

54. ## Math

Okay, so I know this should be really easy but my mind is just drawing a blank: For each series, calculate t12 and S12 a) 37 + 41 + 45 + 49 + ... Okay so I calculated S12 to be 708, and I know that's right. For t12, I know I can easily find the general

55. ## Math

I can't figure out this one question... A ship is docked in port and rises and falls with the waves. The function d(t) = 2sin(30t)°+5 models the depth of the propeller, d(t), in metres at t seconds. e) within the first 10 seconds, at what times is the

56. ## Statistics

A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?

57. ## Chemistry

The reaction (nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water vapor) is believed to take place in three steps, the first of which is the fast reversable dimerization of NO to form N2O2, and the last of which is the reaction N2O +

58. ## Chem

The reaction (nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water vapor) is believed to take place in three steps, the first of which is the fast reversable dimerization of NO to form N2O2, and the last of which is the reaction N2O +

59. ## College Chemistry

Now the reaction (2NO+2H2==> 2H20+N2) is believed to take place in three steps, the first of which is the fast reversible dimerization of NO to form N2O2, and the last of which (again fast) is the reaction N20 + H2 --> N2 + H2O. So, what is the slow

60. ## physics

a motorboat is driven across a river at 5km/h at right angles to a current flowing at 3.9km/h. What is the resulting speed of the motorboat?

61. ## chemistry

What are the the missing reactants for the double-displacement reaction that produces PF5 and AsCl3 ?

62. ## Physics

12. A baseball player throws a ball from left field toward home plate. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the direction of the ball's acceleration? A) up B) down C)

63. ## CALCULUS

At noon, ship A is 40 nautical miles due west of ship B. Ship A is sailing west at 23 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 5 PM? (Note: 1 knot is a speed of 1 nautical mile per

64. ## statistics

a companys ceo wanted to estimate the percentage of defective product per shipment. in a sample contianing 600 products he found 45 defective product. a. find 99% confidence interval for the true porporton of defective product show calcultions and explain

65. ## geometry

Find the value of x if m arc adc=5(x-3) and angle abc=165 degrees.

66. ## physics

9-Volt battery is used to charge a 375 mF capacitor over a 147 Ù resistance. How many seconds will it take for the capacitor to reach 75% of its maximum charge? Hint: The equation below represents the charge of a charging capacitor as a function of time Q

67. ## physics

Two capacitors, identical except for the dielectric material between their plates, are connected in parallel. One has a material with a material with a dielectric constant of 2, while the other has a material with a dielectric constant of 3. What is the

68. ## physics

A rectangular piece of gold is 2.6 cm long and 3.9 cm wide.The piece displays a resistance of 1.47 ìÙ when a current flows along the depth-direction. In cm, how deep is the piece?

69. ## managerial accounting

Department A had 10,000 units in work in process that were 30% converted at the beginning of the period at a cost of \$10,000. During the period, 15,000 units of direct materials were added at a cost of \$60,000, 16,000 units were completed, and 9,000 units

70. ## victoria Ci

We find an electric field of magnitude E = 1.2 x 107 V/m across a particular nerve membrane. The potential difference between the interior and exterior surface of the membrane is 65 mV. The thickness of the membrane is closest to

71. ## physical science

how much work is done on a 100kg crate that is hoisted 4 m in a time of 4 seconds

72. ## health

If you’re aerobically fit, you can A. quit your normal exercise routine without any negative effects. B. sustain a regular routine of exercise for 30–60 minutes with minimal fatigue. C. lift very heavy weights without injuries to your joints. D. run a

73. ## government

Congress's inability to consistently provide leadership on broad national issues is due to

74. ## Fixed Critical analysis essay

In "Phenomenal Woman" by Maya Angelou, the speaker is advising all women to be self-confident no matter what others say, or think. The theme that Angelou portray's is that it's better to be yourself, than trying to act like a different person. In this poem

75. ## chemistry

The density of a gas is 2.0 grams per liter at STP. Its molar mass is approximately?

76. ## Writing Sentences and parahgraphs

You’ve applied for a specific job in your field of study. The Human Resources Department arranges an interview and tells you to bring with you a polished piece of writing for them to evaluate your writing skills. The paragraph must describe one

77. ## literature

when tecumseh says, "where today is the pequot? where the narragansetts, the mohawks?" he is

78. ## Chem

What is PbCO3(s)-->PbO(s)+CO2(g) A. neutralization B. metathesis C. combustion D. decomposition E. combination Looks like the lead carbonate is decomposing to lead oxide and carbon dioxide to me. check my thinking.

79. ## Math

The stem and leaf plot shows the number of cans of good collected by various students for a good drive what was the greatest number of cans collected

80. ## math

Justin recently drove to visit his parents who live 96 miles away. On his way there his average speed was 20 miles per hour faster than on his way home (he ran into some bad weather). If Justin spent a total of 4 hours driving, find the two rates.

81. ## Math

A librarian is expanding some sections of the city library. He buys books at a special price from a dealer who charges one price for any hardback book and another price for any paperback book. For the children's section, Mr. Shah purchased 31 new hardcover

82. ## Geometry

To the nearest tenth, find the perimeter of ΔABC with vertices A(2,4), B(-2,1) and C(2,1). Show your work.

83. ## Science

Identify the following types of tissue as connective, muscle, nerve, or ephithelial: A. Tendon - Muscle B. Sciatic Nerve- Nerve C. Fat - ? D. Blood Vessel - Nerve E. Skin - Ephithelial F. Ligament - ? G. Bone - ? H. Muscle - Muscle ( I got them all except

Molly bought two sweaters for \$30 each and three pair of pants for \$25 each. She had a 20% off coupon for her entire purchase. Model and write an expression for the amount of money Molly spent. State your answer in a complete sentence.

85. ## chemistry

Calculate the pH values and draw the titration curve for the titration of 500 mL of 0.010 M acetic acid (pKa 4.76) with 0.010 MKOH. Calculate the pH of the solution after 490 mL of the titrant have been added. Calculate the pH of the solution after 500 mL

86. ## Math

At the beginning of soccer practice a water cooler contained 5 gallons of water. At the end of practice the water cooler is only 1/4 full. How many gallons of water are in the cooler at the end of practice? Explain

A plumber has a very long piece of pipe that is used to run city water parallel to a major roadway. The pipe is cut into two sections. One section is 12 ft. shorter than the other. If 34 of the length of the shorter pipe is 120 ft., how long is the longer

88. ## Riddle

I have two bodies, joined as one; Watch this trick: Ill flip, stand still, and run. What am I?

89. ## Algebra

a spinner used for a game is divided into sections: yellow, green, and orange. Janie spins the spinner 20 times. The spinner lands on green 8 times. What is the experimental probability that the spinner does not land on green?

90. ## Math

If a bag contains 12 apples, 4 bananas, and 8 oranges, what is the part to whole ratio of bananas?

91. ## Math

Trina works after school and on weekends. She always works three days each week. This week she worked 2 3/4 hrs on Monday. 3 3/5 hrs on Friday and 5 1/2 hrs on Saturday. Next week she plans to work the same number of hrs as this week but will work the same

92. ## math

Michael ate 1/4 of a pizza and his brother ate 3/8 of the same pizza . How much of the pizza was left?

93. ## chemistry

Predict if a precipitate will form when 20.00 mL of the 50% saturated solution is mixed with 20.00 mL of 0.0100M of the following solutions.? the saturated solution is : BaCO3, it has the Ksp of 5.1 x 10^-9 the solubility is 7.1 x 10^-5 M. I don't know how

94. ## math/ unit rates

A garden snail moves 1/6 foot in 1/3 hour

95. ## math/ unit rates

Kenny reads 5/8 page in 2/3 minute

96. ## History 12

What does lenin have to do with Tsarism, World War 1, March revolution and the provisional government, November Revolution, the civil war, War Communism, national Economic Policy, Trotsky, Stalin, and the Comintern?

97. ## Math

Loon lake has a "killer plant" problem similar to Ghost Lake. Currently, 5000 square feet of the lake is covered with the plant, The area covered is growing by a factor of 1.5 each year. Complete the table to show area covered by the plant for the next 5

98. ## physical

a 50 kg object moving at 12 m/s has a momentum of 600 kg times g m/s . what is the mass of an object moving at 4 m/s that has the same momentum?