Need help plz so can u

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39