10 pts. how do you solve: (4.2 x 10⁻¹)(2.5 x 10²)

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Aplane intersects a pris paralel to the base of the prism. the cross section is a polygon wth eight sides. how many sides does the base of the prism have? a. 10 b. 8 c. 7 d. 9