The diameter of a semicircle is 8 millimeters. What is the semicircle's radius?

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.

Which equation shows y= 3 4 x− 5 2 in standard form? a 4x−3y=10 b 3x−4y=10 c 3x−4y=−10 d 4x−3y=−10

Keith bought a package with 2 9/16 pounds of ground meat to make hamburgers he has 2/5 pound of grounded meat left about how many pounds of grounded meat did he use for the hamburgers