Answer:
1170 ft³
Step-by-step explanation:
Volume of prism
= base area × height
= 90 × 13
= 1170
1 gallon is $4.20
16.80/5=4.20

To simplify the fraction, divide the numerator / denominator ( cancel ) by the highest common factor of 25 and 30, that is 5
=
in simplest form