# Calculus question

• Mar 4th 2013, 12:51 PM
buck
Calculus question
I am really stumped can someone help me on these questions. Please.
• Mar 4th 2013, 12:56 PM
HallsofIvy
Re: Calculus question
Have you even tried to do this yourself? Most of this is just arithmetic.
• Mar 4th 2013, 01:00 PM
buck
Re: Calculus question
Okay no honestly I'm doing a test right now and I kind of need the answers for both of them :S
• Mar 4th 2013, 01:59 PM
Plato
Re: Calculus question
Quote:

Originally Posted by buck
Okay no honestly I'm doing a test right now and I kind of need the answers for both of them :S

Why can you at least type the questions out so that we can read them?

Why did you post them so they appear sideways/

You are the one asking for help, so make it easy for us to help.
• Mar 4th 2013, 04:58 PM
hollywood
Re: Calculus question
Here's how I would approach the two problems:

For 6(a), P(0)=10, so you want to set P(t)=5 and solve for t. 6(b) is just asking for the derivative, and for 6(c) you just need to plug in the t you got from part (a) into the derivative in part (b).

For question 7, the slope of the tangent is just the derivative of that function. You need to do a little calculation to figure out what you want it to be, then just take the derivative, set it equal to what you want it to be, and solve for x.

If you're having trouble with something specific, let us know and we'll help you through it.

- Hollywood