9b^2=16 solve using Quadratic

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Consider the polynomials given below. p(x) = x4 + 3x3 + 2x2 – x + 2 q(x) = (x3 + 2x2 + 3)(x2 – 2) determine the operation that results in the simplified expression below. 35 + x4 – 573 - 3x2 + x - 8 a. p+q b. pq c. q-p d. p-q

What is the simplified form of square root of 400 to the 100th power ?