Can someone me with this and explain how to solve it essentially?

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Well for the first equation you plug in the numbers for the variable of pi and r. Since the value of pi is 3.142 and the value of r is 5. You plug it in to the equation like this, C=2(3.142)(5). Then whatever you get then is your answer for the first part. 

For the second equation you basically do the what you did in the first equation. You plug in the values for the variables of pi and r. Which are also 3.142 and 5. Therefore the equation would look like this, A=(3.142)(5)^2. And then when you multiply it whatever you get is your answer.

You need to divide 210 square inches by 35 inches and that’s going to give you 6 inches and that’s the length of the hypothenuse of the right triangle i hope that this you : )

Dis the solution here