Answer:
1850 * 0.7^3 = 634.55
Step-by-step explanation:
Recall that the change of base formula is
k>-2
4k+15>-2k+3
4k-(-2k)+15>3
4k+2k+15>3
6k+15>3
6k>3-15
6k>-12
k>-12/6
15.3 GAL.