A would be the answer

Yeah but that's for physics. I believe in math it's different.

KK:

To find the axis of symmetry you use the formula: x= -b/2a

Once you find the axis of symmetry you can plug into the original formula to find the y value. Since the axis of symmetry is the x value of the vertex.

C

Tell me if you need an explanation.

If you think about it, how many contributors she has already lined up is not necessary. They just put that in to throw you off.

If each contributor is going to pay an equal amount. Then the cost/# contributors.

\( C = {500 \over n}\)

So we simply do 500/20 to see how many new contributors Jane must recruit.

C = 500/20

C = 25 contributers.

Umm, so what do we do?

Nope, thank you for all the help :)

Yep! No need to re-do it, I copied your steps with the correct derivative. Thanks :)

So the Point of Intersection would be: (-17/21,-17/21)

Since the actual slope is -20

23=-20(-2)+b

b=-17

y=-20x-17

Setting them equal to one another

x=-17/21 -- Plugging in to find y

POI = (-17/21,-17/21)Is that correct?

√(1/4) = 1/2 (or 0.5) If you think about it square root of 1 is 1 and the square root of 4 is 2.

0.5/4√1/8 = √2/4

Isn't the derivative of f(x)=5x^2+3 = f'(x)=10x

Okay, but they say the point 2,1 exists. On that graph 2,1 is just put there. Is that allowed?

t^2=324

Take the square root of both sides

t = +/- 18

t = -18, 18

Okay, so this what got me a bit confused:

How can there be -2 seconds in a real-life problem?

10 log (1.8 x 10^12)

= 122. 6