Factor the expression completely.
15x2 - 40x-15

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=

Calculate the effective quarterly compound interest rate equivalent to a 1% of monthly compound interest rate.

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?