544 is what percent of 640?

Solve for x i'll try to attach the files bc it's not letting me for some reason

17 in long 1.3 ft wide and 8in high what is the volume

Identify which functions are linear or non-linear. a. f(x) = x2 + 1 b. f(x) = 2x + 5 c. f(x) = x 2 + 3 d. f(x) = 3 x + 7 e. f(x) = 4x + 10 2 - 5