Simplify the expression 7x + 4 + 8x + 6. A.
15x2 + 10

B.
15x + 10

C.
25x2

D.
25x

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same