Easy ! explain step by step so i can right it down.

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Find the distance between the point (-3,-4), and (see the picture below)

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in