What are the solutions to the inequality (x-3)(x+5)<_0 ?

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9

The least common multiple is the multiple, other than 0, common to sets of multiples.