I would really appreciate help on these equations.

3. Devon tosses a horseshoe at a stake 30 feet away. The horseshoe lands no more than 3 feet from the stake. (a) Write an absolute value inequality that represents the range of distances that the horseshoe travels. (b) Solve the inequality.

Solve for x
4. (x - 2)(x + 1) = 4
Factor completey
7. 2x^4 + 16x