What is a equivalent fraction for 4/21

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

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