8th grade math, please help.
I’ll give you brainliest if you want.

-Find the volume-

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Write as a product: ac^2–ad+c^3–cd–bc^2+bd