Can someone check my work and tell me if i have my answers correct or not. (i have pictures) with 6 questions.

Three cylinders have a volume of 2836 cm^3. cylinder a has a height of 900 cm. cylinder b has a height of 225 cm. cylinder c has a height of 100 cm. find the radius of each cylinder. use 3.14 as an approximate for π

How do you write y-10=2 (x-8) in standard form

What is the point slope form of a line with slope -5 that contains point (2,-1)