# q

Popular questions and responses by q
1. ## Physics

A refrigerator has a coefficient of performance of 4.0. When removing 2.4x10^4 J from inside the refrigerator, how much energy is sent into the environment?

2. ## Calculus

There are 50 apple trees in an orchard, and each tree produces an average of 200 apples each year. For each additional tree planted within the orchard, the average number of apples produced drops by 5. What is the optimal number of trees to plant in the

3. ## Spanish

Complete the sentences with the correct form of the adjective in parenthesis: 1. Las rebajas en __________________ (estas) almacén son buenísimas. 2. Me quiero comprar ______________ (ese) zapatos porque están muy bonitos. 3. Voy a usar

A rectangular piece of paper with perimeter 100 cm is to be rolled to form a cylindrical tube. Find the dimensions of the paper that will produce a tube with maximum volume. I have made it up to getting an equation for V(w).

For an outdoor concert, a ticket price of \$30 typically attracts 5000 people. For each \$1 increase in the ticket price, 100 fewer people will attend. The revenue, R, is the product of the number of people attending and the price per ticket. a) Let x

6. ## Algebra II

From 1990-1994 the mail order sales of health products can be modeled by S= 10t^3+115t^2+25t+2505 where S is the sales (in millions) and t the number of years since 1990. In what year were about \$3885 million health products sold.

7. ## algebra

If Jenny's car uses less gas per mile driven than Sandra's truck, how does the graph representing the rate of change of Sandra's truck compare to the graph representing the rate of change of Jenny's car?

8. ## Math

A 20-inch pizza is cut into 9 equally sized pieces. How many radians does each slice represent? What is the 'sector area' of each slice?

9. ## AP Chemistry

The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't

10. ## Chemistry

Consider this equilibrium N2(g) + H2(g) NH3(g) +94 kJ The equilibrium law exoression for the balanced chemical equationwould be A. [N2][H2]/[NH3] B. [NH3]/[H2][N2] C. [NH3]2/[H2][N2] D. [NH3]2/[H2]3[N2] E. 2[NH3]2/3[H2]3[N2]

11. ## MATH157

SUPPOSE YOU BUY 1 TICKET FOR \$1 OUT OF A LOTTERY OF 3000 TICKETS. IF THE PRIZE FOR THE ONE WINNING TICKET IS TO BE \$500, WHAT ARE YOUR EXPECTED WINNINGS?

12. ## chemistry

A sample of silver chromate (Ag2CrO4) has a mass of 29.0 g. (a) How many Ag+ ions are present? (b)What is the mass in grams of one formula unit of silver chromate? (c) How many CrO42- ions are present?

13. ## physics

A 47.0 g golf ball is driven from the tee with an initial speed of 54.0 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. What is its speed when it is 9.0 m below its highest

14. ## science

Egg-laying land animals have evolved to produce eggs with tough shells to ensure that A .external fertilization can take place. B.the egg and sperm can fuse C.parental care is unnecessary*** D. the developing embryo does no dry out

15. ## Physic

A space station that does not rotate cannot simulate gravity for its occupants. A)True B)False From within a rotating reference frame, the centrifugal force simulates gravity. A)True B)False On a rotating station, a person at the center of the station, in

16. ## Math 3rd

Tim tracked the change in outside temperature one afternoon. He recorded a temp of 85.4 f at noon. The Temperature then rose 3.85 f over the next 4 hours. At 5:00 Tim recorded the temperature of 89.25 f how did the temperature change betwn 4:00pm and

17. ## math

simplify (8*10^7)(7*10^4) i think it's 5.6*10^10 simplify (3*10^6)(8*10^-4) i think it's 2.4*10^3 Astronomers measure large distances in light-years. One light-year 5.88*10^12 mi Star is 9.8*10^1 light years from Earth in scientific notation how many miles

18. ## Algebra

110 student went to the lake for a boat ride. there were 8 both (each would safely hold the same number of student), and all but 14 students could go for a ride. those remaining 14 students had to wait until first students finished their ride before they

19. ## Math

water flows over a dam at a rate of 500 gallons per minute write a function rule relating the amount of water a that flow over the dam to the number of minutes m that have passed what are the initial value and rate of change

20. ## AP Chemistry

Calculate ΔHrxn for the following reaction: C(s)+H2O(g)→CO(g)+H2(g) Use the following reactions and given ΔH values: C(s)+O2(g)→CO2(g), ΔH= -393.5 kJ 2CO(g)+O2(g)→2CO2(g), ΔH= -566.0 kJ 2H2(g)+O2(g)→2H2O(g), ΔH= -483.6 kJ

21. ## English.

Please check my answers? Letter of Recommendation Mary O'Dell PLTW Program Willow High School 1400 Old Tamah Road Irmo, SC 29067 April 11, 2007 Subject: Letter of Recommendation for Mr. Chris Moses To Whom It May Concern: Chris studied under my supervision

22. ## Calculus

Linda has \$9000 to invest. She invested x dollars in an account that earned 3% simple interest and the remainder of the money in an account that earned 2.6% simple interest. In one year, both accounts together earned \$250 interest. How much was invested in

23. ## chemistry

Calculate the amount of heat absorbed when 58 g of steam at 117◦C are completely converted to ice at −32.5◦C. Specific Heat: H2O(s) = 2.09 J/g◦C H2O(l) = 4.18 J/g◦C H2O(g) = 2.03 J/g◦C Heat of Fusion = 334 J/g Heat of Vaporization = 2260 J/g

24. ## math

a football player attempts a field goal from a distance of 52 yards. The ball reaches a maxium height of 9 yrds and lands 8 yards behind the uprights. If the uprights are 3 yards high. algebraically determine if the field goal was successful

25. ## chemistry

i need help solving this Benzoic acid is a weak, monoprotic acid (Ka = 6.3 × 10−5). Calculate the pH and the percent dissociation of each of the following solutions of benzoic acid. Then use Le Châtelier’s principle to explain the trend in percent

26. ## chemistry

How would you do this question: A student dissolved 5.0 g of vitamin C in 250 mL of water. The molar mass of ascorbic acid is 176 g/mol, and its Ka is 8.0 × 10−5. Calculate the pH of the solution. Note: Abbreviate the formula of ascorbic acid to HAsc.

27. ## Calculus

Find a positive number such that the sum of the square of the number and its reciprocal is a minimum.

28. ## Math

2x(√3x^2)*2√x how would you simplify this?

29. ## Math

2x√3x*2√x i was wondering how to simplify this

30. ## Complex Math

Compute all possible values of e^i

31. ## Calculus

Evaluate the surface integral. the double integral of (x^2 + y^2 + z^2)dS over Region S. S is the part of the cylinder that lies between the planes z = 0 and z = 5, together with its top and bottom disks Can anyone help?

32. ## multivariable calculus

Studying for a test, and saw this: Find the center of mass of the hemisphere x^2 + y^2 + z^2 = a^2; z>=0 if it has constant density. Any ideas?

33. ## physics

In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?

34. ## english

What is the author referring to in this reading passage? Thus early had that one guest,--the only guest who is certain, at one time or another, to find his way into every human dwelling, --thus early had _______ stepped across the threshold of the House of

35. ## physical

David's clock ticks once for every two of Phil's clock ticks. How fast is Phil moving by David?

36. ## physical

Franky claims he has a mass of 65kg. He is sitting on a spherical bouy that oats just barely submerged under water. When he gets o it rises halfway out of the water. What must the radius R in centimeters of the sphere be for him to be telling the truth?

37. ## PHYS

You throw a bowling ball o the empire state building(381m high) 10m/s down- ward. How long does it take to get to the bottom?

38. ## Quick Math Question

How do I add time? If a person worked 4 1/2 hours on Monday, 4 1/2 hours on Tuesday and 2 hours on Wednesday, does that add up to 12 hours? If not, how much more time would the person need to work the next day to equal 12 hours?

39. ## engineering mechanics

A person A is trying to keep his balance while on a sled B that is sliding down an icy incline. Let mA = 78kg and mB = 25 kg be the masses of A and B, respectively. In addition, let the static and kinetic friction coefficients between A and B be μs = 0.4

40. ## Physics

A refrigerator does 18kJ of work while moving 115 kJ of thermal enegy from inside the refrigerator. What is its coefficient of performance?

41. ## Math

For a class C corporation in Louisiana, the amount of state income tax S is deductible on the federal return and the amount of federal income tax F is deductible on the state return. With \$200,000 taxable income and a 30% federal tax rate, the federal tax

42. ## Chemistry

which of the following statement are true for all electric cells? I. electrons flow from the anode to the cathode II. reduction occurs at the anode III. oxidation occurs at the cathode IV. oxidation occurs at the anode V. reduction occurs at the cathode A.

43. ## maths

if 3x + 8 =20 - 3x, what is x

44. ## geometry

if 3x + 8 =20 - 3x, what is x

45. ## american government

What is the difference between civil liberties and natural rights?

46. ## math

5x-3y=11 4x-7y=18

47. ## accounting

Derm Travel Agency accepted a four-month, 9% interest rate, 52.000 note from one otits customers on May 1, 2008. The entire balance is payable at the notes maturity. Prepare the May 31 adjusting journal entry related to this note. Do I debit cash and

48. ## chemistry

A jogger runs at an average speed of 5.9 mi/h. If she starts a run at 11:15 am, what time is it after she covers 4.75 x 104ft?

49. ## Chemistry

why different detergents have different price?on what physical properties are their qualities based?

50. ## chemistry

Determine the number of representative particles in each of the following and identify the representative particle. a. 13.0 mol Ag b. 23.7 mol H20 c. 0.178 mol NaCl

51. ## chemistry

how many grams of CaCl2 would be dissolved in 1.9 liters of a 0.2 molarity solution of CaCl2?

52. ## chemistry

Determine the number of moles of sulfate ions present in 1.20 mol iron(III) sulfate (Fe2(SO4)3).

53. ## math

The sales representative informs you that there are two floor plans available, and that there are a total of 56 houses available. Use x to represent floor plan #1 and y to represent floor plan #2. Write an equation that illustrates the situation. The sales

54. ## life science

Explanation of why the process of mitosis and meiosis are both important to a living organism. When would an organism need to undergo the process of mitosis? When would an organism need to undergo the process of meiosis? What would happen if meiosis did

55. ## algebra

i need help finding the base. this is the equation i got after work it out halfway. 42/h+h+sqroot(42/h)^2+h^2=20 ft how can i find B & H. How should i go about. Thanks. Isnt the sqrt of (42/h)^2 just 42/h ? Then, multipy both sides of the equation by h,

56. ## Life Science

How did Mendel’s approach to answering scientific questions differ from that of his contemporaries? Thank you for using the Jiskha Homework Help Forum. You might want to see the answer just posted for Diana.

57. ## help with solving

x^2+(x-2)^2 = (2x-6)^2 solve for x. thanks so much. Please keep in mind that tutors here won't simply do your work for you. I'm sure you'll get a better response if you show your work as far as you can get, so tutors will know where you get stuck. =) it

58. ## algebra

solve for x (24+2x)(10+2x) - 240 = 152 First multiply. 24(10) = ___ 2x (2x) = ____ Now subtract 240. Can you finish the problem from here? dont i need to put this in equatic equation to solve for x. cause i need to find the width of a small rectangle

59. ## Life science

are humans subject to the same pressure of natural selction as other organism Humans show signs of natural selection occuring, according to these studies. http://www.news.cornell.edu/stories/Oct05/Bustamante.kr.html (Broken Link Removed)

60. ## Science

I need to know how to compare mouthwash and toothpaste...what to compare?.. compare bacteria samples in salaiva.

1. ## Calculus (Urgent Help)

q

posted on June 11, 2020
2. ## English

still correct 100%

posted on March 11, 2020
3. ## English

both correct!

posted on March 3, 2020
4. ## Exponential Growth and Decay

Zolita is still correct!

posted on February 26, 2020
5. ## Englishhh

Its B A B B B

posted on February 24, 2020

Bobby is right!

posted on February 17, 2020
7. ## Algebra worksheet

Dear Anyone-Who-Thought-The-Same-Thing-I-Did, There are a few questions at th top that are mixed up but if you listen to Reiny and tbh follow there exact letter answers and don't change any besides 3 (which is actually B) then you will pass 10/10 100%

posted on December 16, 2019
8. ## Math

Dear Mr.?, Thank you for your honesty. I really helped a lot of students with their answers as well as trust issues. As the web is not so trusting.

posted on December 12, 2019
9. ## Math

Dear Ms. Sueee, Obviously, you are struggling and retarded as well, seeing as though you did not provide the answer I can only assume you came here for the same reason this "kid" did. If you didn't I am sure you would have answered the question yourself,

posted on December 12, 2019
10. ## Algebra 1 HELP PLEASE!

Dear Help, I am pretty sure no one is going to give you all the answers to the quiz but If you would try to look them up elsewhere I am sure they will pop up. Are you on you Web Search Unit as well?

posted on December 12, 2019
11. ## English

EZPZ connexus is 100% correct trust me

posted on December 6, 2019

Elma is correct

posted on December 4, 2019
13. ## math

A credit card had an APR of 14.86% all of last year, and compounded interest daily. What was the credit cards effective interest rate last year

posted on November 16, 2019
14. ## Probability

1. 0.653 2. 0.257 3. 0.159

posted on July 24, 2019
15. ## calculus

posted on January 30, 2019
16. ## Social Studies

14. A "(in the former Soviet Union) the policy or practice of more **open** consultative government and wider dissemination of information, initiated by leader Mikhail Gorbachev from 1985." 15. B "(in the former Soviet Union) the policy or practice of

posted on January 24, 2019
17. ## Science

-)_(- is correct tysm

posted on October 23, 2018
18. ## Astronomy

Wrong

posted on September 27, 2018
19. ## Science

Bruh is correct! Thanks!! Answers: 1. A 2. D 3. B 4. B 5. A

posted on September 26, 2018
20. ## Social Studies

posted on September 21, 2018

oof

posted on September 18, 2018
22. ## Math

150

posted on February 28, 2018
23. ## statistics

3799

posted on February 22, 2018
24. ## Chemistry

The phase fraction is calculated using the 'Lever Rule'. I can't figure out how to do it, but it involves using this formula- X = (c-b)/(a-b) Where a, b, and c are distances between x-coordinates at various phase boundaries. But the phase diagram in this

posted on December 3, 2017
25. ## Chemistry

Ghh

posted on December 1, 2017
26. ## MATH HELP

no its wrong

posted on September 11, 2017
27. ## chemistry

q

posted on March 23, 2017
28. ## Chemistry

posted on March 21, 2017

Aboringjob

posted on December 6, 2016
30. ## Improving writing assignment

I have noticed that in the last three months, the performance and qualities of work has been compact due to workloads unbalanced, since Jessica Hilo our executive manager has been on medical leave for last four months. Her responsibilities have been shared

posted on June 3, 2016
31. ## math

123145

posted on December 7, 2015
32. ## social studies

what colonies French find as a result of the northwest passage way.

posted on November 17, 2015
33. ## Soc Stud

so its c

posted on October 21, 2015
34. ## Maths Probability

Anyone got right answer for c = ?

posted on May 25, 2015
35. ## Probability

Is that the right answer for c?

posted on May 25, 2015
36. ## probability

Let N be the numbers of passengers that show up. So p=0.9 and E[N]=0.9n and σ=(n*0.1*0.9)^1/2=0.3*n^1/2. Using Moivre-Laplace we have P(N≥300.5)≈0.01 Next you should use CLT, solving quadratic equation and find value of n

posted on April 29, 2015
37. ## Probability

Jacob, can you explain how did you get these answers? I want understand this problem

posted on April 15, 2015
38. ## English.

Thanks?

posted on March 12, 2015
39. ## AP Chemistry

I got it! The initial concentration of CN- would be 0.065 M rather than 0 M.

posted on January 20, 2015