Answer:
36
Step-by-step explanation:
54/3=18
18x2=36
$4.18 would be his change back
x^9/8
The exponent property that you can use here is that when multiplying the two exponents, you add their exponents
Thus, (x^7/8) (x^1/4) = x^(7/8+1/4)=x^9/8
correct me if im wrong