1. maths

x=tcost & y=t+sint then find dx2/d2y

2. chemistry

Taking note of the equilibrium 4HCl(g) + O2(g) ----> 2H2(g) + 2Cl2(g). What would be the the equilibrium law expression for the balanced chemical equation?

3. MAT 116 Algebera 1A

What similarities and differences do you see between functions and linear equations studied in Ch. 3? Are all linear equations functions? Is there an instance when a linear equation is not a function? Support your answer. Create an equation of a nonlinear

4. calculus

identify the conic section. Write in standard form and graph. 5x^2-6y^2-30x-12y+9=0

5. physics

A dime .334 m away from, and on the optical axis of, a concave spherical mirror produces an image on the same side of the mirror as the source. The image is .093 m away from the mirror. If the dime is moved on the axis to .229 m from the mirror, how far

6. Math

find the are of a regular octagon whose sides are 12cm long.

7. Calculus

Sketch a graph of a function f(x) that is differentiable and that satisfies the following conditions. c) f'(-3) = 0 and f'(1) = 0 Please show me, step by step, how to sketch the problem!

determine the mass of CO that is produced when 45.6g of CH4 react with 73.2g of O2. 2CH4 + 3O2 ---->2CO + 4H2O nCH4 = 45.6 g/16.05 g/mol =2.84 mol nCO=2.84 mol mCO=n*M =2.84*28.01 =79.5 grams

9. physics

An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror. How far from the mirror is it necessary to place the above object

10. physics

By what length is a light ray displaced after passing through a 4.7 cm thick sheet of material (n=1.38) with an incident angle of theta = 33.5°.

11. MAT116- Algebra 1A

What is the difference between domain and range? Describe a real-life situation that could be modeled by a function. •Provide feedback about your classmates’ answers. Describe the values for x that may not be appropriate values even when they are

12. MATH

solve traingle ABC if A=63 degrees 10minutes, b=18 and a=17. Mark all solutions clearly.

13. math

7y=2x-5, the x equals what?

14. Science

I have to write a paper on what I consider to be "bad science" and proved an example of what is bad science such as something from the media, commericals, scientist's statement. I was wondering if someone could help me find an example of "bad" science

15. Oral Presentations

I've got an upcoming speech to prepare, and my teacher has hardly given any preparation time and I'm the type of person who is very conservative and quiet. I'm afriad of being boring with my speech because our teacher has told us to make it interesting,

Only a chemist can be trusted with the combination to the safe containing a ton of money. The combination is the pH of solution A, followed by the pH of solution C. (for example: is the pH of solution A is 3.47 and the pH of solution C is 8.15 the

17. History

How much is an Italian Florin worth, compared to current American Money?

18. English Expression

There is a book at the back of the box. There is a book at back of the box. ----------------------------- Which idiom should I use?

19. Math~Algebra

11. A black racer snake travels 46.0 km in 20 hours. What is the speed in km/h?

20. Fallacys

can any one please check thisfor me? Fallacy Type Fallacy Statement Ad hominem/genetic 8. From one politician about another: “He’s a two-faced, liberal, anti-family, anti-values idealist!” Wishful thinking 15. Sure, I’ve heard that it’s better to

21. Economics

write a lecture that explains the gold standard and addresses the functions of the world’s major foreign exchange markets.

22. Intermediate algebra

Seven times the difference of six and a twice a number yields the same result as the same number decreased by one.

23. physics

A laser beam enters a .125 m thick glass window at an angle of 39° (from the normal). The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel through the glass? that answer is 25.53 deg the second part asks How

24. physics

At 08:00hrs a 2.0- m-long vertical stick in air casts a shadow 1.8 m long. If the same stick is placed at 08:00hrs in air in a flat bottomed pool of salt water half the height of the stick, how long is the shadow on the floor of the pool? (For this pool, n

25. Algebra

A long distance trucker traveled 280 miles in one direction during a snow storm. The return trip in rainy weather was accomplished at double the speed and took 5 hours less time. Find the speed.

26. Math

Please help me with this math problem. A woman is given a loan of \$20,000. for 1 year. If the instrest charged is \$800, the was was the intrest rate on the loan? To get the answer I set the problem up like this: R= 800/20,000= 25(1/100)= 25/100= 25% but I

27. science

do disagree with the increase dependence on nuclear power to solve U.S. energy problems?

28. Social Studies

Explain the economy of China. Include goods and services, resources, trade, and division of labor. no wikipedia

29. chemistry

What mass of NaCl should be found in 0.51 L of a saturated solution of sodium chloride if the Ksp of NaCl is assumed to be 1.5 x 10-5?

30. science

what is the relation between volts and amps?

31. Math

The width of a swimming pool is 18.5 ft, and the length is 10.75 ft. Write the ratio of length to width as ratio of whole numbers. Is the right answer 5/9?

32. precalculus

find the trigonometric form of the following number: -7 + 4i I keep getting the wrong answer for these questions. mine was: square root of 65 (cos330.255 degrees + sin330.255i degrees)

33. econ

True or False? E=exchange rate Suppose E\$/euro = 3/2 and E\$/pound = 2 and there is no trade friction, the no arbitrage condition implies that E pound/euro = 2

34. science

do you agree with the find and develop more domestic supplies of oil to solve the U.S. problems?

35. Algerbra II

What formula do you use when dealing with money and interest rates over time? Thanks

36. chemistry

A solution of potassium chloride has a pH of 7.81.What is the [OH-] in mol/L ? Can you please show steps I would appreciate it very much. Thank you

37. AED

can anyone suggest on how I could do a conclusion for this paper. Mentoring vs. Induction Programs i did my intro now. Now I need help with the conclusion

38. Critical Thinking

Fallacy Type Fallacy Statement Ad hominem/genetic 8. From one politician about another: “He’s a two-faced, liberal, anti-family, anti-values idealist!” Wishful thinking 15. Sure, I’ve heard that it’s better to not eat cheeseburgers every day, but

39. animal art

raw sienna can best be described as a

40. science

can someone help me answer this question? How is the sickle anemia gene maintained (why doesn't it destroy itself)?

41. accounting

what is the proper sequence for end of the month work with combination journal

42. econ

T or F, and a little explanation would be helpful. Relative PPP (purchasing power parity) is a better approximation of reality when one of the two countries is suffering hyperinflation and the other is not.

43. french

"a destination de New York" means the plane is going to New York or from New York?

44. Pre-calc

Simplify i^51 Im really not sure what they are saying. i to the 51ith power? Wouldnt it already be simplfied or what. It doesnt make sense to me.

45. Genetics

Hi, If a gene for neprilysin contains 80 000 base pairs, and neprilysin contains only 749 amino acids, can anyone explain the significance of the difference between the numbers ? Can anyone suggest a place where I can read more on this topic ? Thanks.....

I'm pretty sure that OH- has a bond order of 1. OH+ has a bond oder of 1. confirm this please.

47. History

During the Renaissance, in Italy, how much money was a lot of money? (using Italian Currency. i.e Ducats, Florins....)

48. History

Good afternoon, Here's my question...when were women seen as person and what is the royal comission on the status of women? Thank you so very much :)

49. math

Which rates are equivalent? A. 36 us dollars/48 canadian dollars= 54 us dollars/72 canadian dollars B. 18 us dol./24 can. dol.= 45 usdol./48 can. dol. C. 18 us dol/24 can dol.= 54 us dol/60 can dol. D. 48 us dol./64 Can Dol= 72 US dol./128 can dol.

50. french

As-tu repondu a la lettre se ta soeur? How would I know whether to use indirect object pronoun or the pronoun y? J'y ai repondu. or Je lui ai repondu. Sorry i don't know how to do the accents.

51. science

How is sickle cell anemia maintained in our world (why doesn't it eradicate itself)?