Ineed with my homework answer this correctly no wrong answers

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box

Hurry which expression is equivalent to 3√x^5y?