If f(x) = 1/12x+4 and f(a)= 8, what is the value of a

If f(x)= 3x+6 which of the following is the inverse of f(x)

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?