You have the following function:

Derivate implictly the previous expression, as follow:

Where you have used that:

Then, the implicit derivative of the given expression is:

Next, solve for y' as follow:

I think they should say they last name
The first one is correct because the angle on the opposite side is the same, and the second one is correct too because it's the same points. So you can pick either or.
90 cu in.
V= L * W * H
Split shape into two figures
Answer: 15 mL
Step-by-step explanation:
Before the stone the reading was 180 mL
When the stone was added the reading rose to 195 mL
So, we subtract them both, this will give us the volume of the stone
195 mL - 180 mL = 15 mL