Part A: Solve for n; -n*p - 90 < 30 Add 90 to both sides. -n*p < 120 Divide both sides by p. -n < 120/p Divide both sides by -1. n [tex] \geq [/tex] 120/-p is your answer for part A.
Part B: Solve for h; 5m - 3h = 45 Subtract 5m from both sides. -3h = -5m + 45 Divide both sides by -3. h = (-5m + 45)/-3 is your answer for part B.