# Terra

Most popular questions and responses by Terra
1. ## Statistics

The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.15 grams per mile . (a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01

2. ## economics

What does the curved line represent in the graph?

3. ## Physics

The figure below shows a thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle θ and released. (a) What is the

4. ## Calculus

Differentiate. f(x) = 4xe^xcsc(x)

5. ## math

a carpenter has a wooden stick that is 84 centimeters long.then she cuts of 25% from the end of the stick.then she cuts the remaining into 6 equal pieces.what is the length of each piece?

6. ## math

A stone is tossed vertically into the air from ground level with an initial velocity of 15 m/s. Its height at time t is h(t)=15t-4.9t^2. Compute the stone's average velocity over the time interval [0.5, 2.5]. It says the answer is .3, but I keep getting

7. ## math

the actual sales for the last four years have been 24 units,30units,23units and 27 units what is the average number of units you can expect to sell next month?

8. ## calculus

Show that tan^3(x)-8(tan^2(x))+17(tan(x)0-8 = 0 has a root in [0.5, 0.6]. Apply the Bisection Method twice to find an interval of length 0.025 containing this root. I have NO idea where to go with that equals 0 part...I could figure it without it but that

9. ## Physical Science

A dog is chasing a cat; the cat's velocity is "v". The dog's velocity is directed towards the cat at all times. The dog maintains a constant speed "v". At the instant when the velocity of the dogs "v" and the cats "v" are perpendicular the distance between

10. ## corporate finance.

At any given time how would the yeild curve facing a AAA-rated company compare with the yield curve for u.s. treasury securities? At any given time how would the yield curve facing a BB-rated company compare with the yield curve u.s. treasury securities.

11. ## math

solve for the unknown: 6e^(-4t) = 2

12. ## math

Simplify by referring to the appropriate triangle or trigonometric identity: cos(arctan(x))

13. ## Math

For middle school pizzaz worksheet number 66, moving words.What's the answer? I need the answer, like, ASAP.

14. ## Physics

Zero, a hypothetical planet, has a mass of 4.0 1023 kg, a radius of 3.0 106 m, and no atmosphere. A 14 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 107 J, what will be its

15. ## Multiplying and Dividing Decimals

Sam and 3 friends ate lunch at Red Lobster. They decided to split the bill evenly. The total bill was \$71.80. How much was each person's share? *Note: Please do not just give me the answer, but also show me how said answer was achieved and the steps to

16. ## math

find derivative using limit definition: f(x) = x - sqrt(x) so f'(x) = lim h->0 [f(x+h) - f(x)]/h but I keep trying to solve by multiplying by the conjugate but I can't figure it out..there's nothing that can be cancelled or anything and I can't get the

17. ## Ms. Sue

I've looked at a lot of these questions and I'm disappointed that people don't appreciate Ms. Sue at all. She takes a lot of time out of her day to help students get better grades. Thanks Ms. Sue, for being a great tutor.

18. ## economics

What gives the U.S. government the right to collect taxes?

19. ## calc - limits

I have been trying to figure out these limit problems and I get stuck on trying to move the function around to make it possible to solve. The first one is: lim sinx - cosx / tanx - 1 x--> (pi/4) All I've gotten so far is to replace tanx with sinx/cosx but

20. ## Math

Suppose there is a 10 meter ladder leaning against the wall of a building and the base of the ladder is sliding away from the building at a rate of 3 meters per second. How fast is the top of the ladder sliding down the wall when the base of the ladder is

21. ## calculus

using the intermediate value theorum, prove that arctanx = arccosx has a solution. i've gotten that the domain of arctanx is -pi/2 to pi/2 but i'm not sure where to go from here...can i move the arccosx to the left? when i do that, i can't figure f(pi/2)

22. ## calc

how do i find the derivative of 16^(sinx)

23. ## math

Estimate the instantaneous rate of change at the point indicated. y(t) = sqrt(3t+1) t=1

24. ## math

arcsec(sec(3Π/2))

25. ## U.S. World History

I need to compare and contrast the ideas and pilosophies of the Federalists and Antifederalists!

26. ## Statistics

Key considerations as Allied develops its strategy for disposing of the case are the probabilities associated with John’s response to an Allied counteroffer of \$400,000 and the probabilities associated with the three possible trial outcomes. John will

27. ## Statistics

Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence

28. ## Hypothesis

Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence

29. ## Statistics

Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence

30. ## calc

Using Ohm's Law (V=IR), where units are volts, amperes, and ohms, and V is a constant 12, calculate: a) The average rate of change of I with respect to R for the interval from R=8 to R=8.1 b) The rate of change of R with respect to I when I = 1.5

31. ## calc

find derivative using limit definition: f(x) = x - sqrt(x) so f'(x) = lim h->0 [f(x+h) - f(x)]/h but I keep trying to solve by multiplying by the conjugate but I can't figure it out..there's nothing that can be cancelled or anything and I can't get the

32. ## math

touchdowns are six points per touchdown and an extra point can be awarded by making a field goal. Assuming that a team makes a field goal every time they score, write an equation to find "y" the total score for "x" amount of points.

33. ## biology - environmental

How does the edge (shoreline) of a marsh/wetland affect the wetland? Would it be better for the wetland to have a round or broken shoreline? Are coves, peninsulas and islands important to have? How does the shape affect wave action and exposure to wind?

34. ## Chemistry

You have a 100mL cylinder containing 40mL of water. A cube measures 2cm on each side is lowered into the cylinder. What is the new volume reading of the cylinder?

35. ## calculus

find the derivative with respect to x: sqrt(x+s) = (1/x) + (1/s)

36. ## science

if i have a Km of 9.78 x 10^-3, is that a relatively high Km, and therefore a low affinity for an enzyme?

37. ## math

My teacher makes us use this: => and to symbolize the steps we use to find our answers, but I don't understand the difference. Can someone please explain it?

38. ## math

Show that the following function is continuous only at x=0 : f(x) = x for x rational -x for x irrational

39. ## math

how do you do the following without a calculator: 3 x 4^(1/4) - 12 x 2^(-3/2)

40. ## calculus

Show that if a,b does not equal 0, then the line with x-intercept x=a and y-intercept y=b has the equation: x/a + y/b = 1

41. ## Biology

Should humans strive to preserve a representative sample of all biomes or aquatic zones?

42. ## american government

Regulatory capture involves situations in which: a)a bureaucracy is responsive to the interest of the group or corporation that they are supposed to regulate b)bureaucrats make decisions without reference to interest groups, elected officials, or even

43. ## corporate finance.

Suppose you observe the following Maturity 1 year Yield 6.0% Maturity 2 year Yield 6.2% Maturity 3 years Yield 6.4% Maturity 4 years Yield 6.5% Maturity 5 years Yield 6.5% What does the market expect will be the interest rate on 1yr. securities 1 year from

44. ## calculus

Please help me find the derivative of f(x) = x^(2^x) I got to ln(f(x)) = 2^x(lnx) but now I'm stuck..

45. ## chemistry

would aromatic rings be acidic or basic? they don't really have anything to lose or any spots to gain...

is charles v of the holy roman empire catholic or protestant?

1. ## math

Because 39+39=78

posted on December 19, 2017
2. ## math

-12?

posted on May 31, 2017
3. ## Math

that is true

posted on February 6, 2017
4. ## College Physics

a scooter and a rider together have a mass of 275kg. if the scooter slows with the acceleration of 4.50m/s^2, what is the net force of the acooter and the rider together?

posted on June 19, 2015
5. ## Multiplying and Dividing Decimals

This is where I believe I have found my error. This was my work: 23.9 _______ 3) 71.80 - 69 ______ 28 -27 ____ 10 -9 ____ 1 I have been caught in a place where I am stuck; doomed to repeat the same 23.999...pattern so I do I round it up to_______ or-?

posted on November 7, 2012
6. ## Multiplying and Dividing Decimals

Okay. I have tried dividing but was unsure of my result. I have now found my error and will redo my division. Then I will let you see my process of what I have done.

posted on November 7, 2012
7. ## Statistics

And by .9 I definitely meant n.....haha

posted on January 12, 2012
8. ## Statistics

Never mind, got it. If anyone wants to know how to get it though... 1.5/(sq root of .9)=.01 Solve the equation, then square each side. Answer=225

posted on January 12, 2012
9. ## calculus

of the equation that i put... sqrt(x+s)=(1/x)+(1/s) you have to take the derivative of both sides but i'm getting stuck

posted on October 16, 2011
10. ## Chemistry

Volume = length x width x height (units)^3

posted on October 3, 2011
11. ## math

ahh sorry that was supposed to be a new question. i need help with both though hahah, so pleaseee help me! i know derivatives but not in these contexts.

posted on September 26, 2011
12. ## math

Some studies suggest that kidney mass K in mammals (in kilograms) is related to body mass m (in kilograms) by the approximate formula K = .007m^(0.85). Calculate dK/dm at m = 68. Then calculate the derivative with respect to m of the relative

posted on September 26, 2011
13. ## math

Yes, he said that the one with one arrow means "if and only if" and then the other one, I have no clue. And I feel like he changes when he uses them so I'm confused hahah. I would just use and equals sign.

posted on September 20, 2011
14. ## math

thank you! :]

posted on September 4, 2011
15. ## math

ahh sorry that was supposed to be a separate question.

posted on September 4, 2011
16. ## math

solve for the unknown: 6e^(-4t) = 2

posted on September 4, 2011