Please help find volume of cone use 3.14 for pi

In which form is the following function written? y = - 2(x – 3)(x + 5)

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?

For what values of a is the sum of the fractions 2a−1 / 4 and a−1 /3 positive?