Answer:
7
Step-by-step explanation:
5/4
$16.6
x is the price of each CD before tax
so 3x + 3.60 = 53.40
3x = 53.40 - 3.60 = 49.80
x = 49.80/3 = 16.6
7/20
given,
2r = 7/10
r= 7/10*1/2
r= 7/20
100-3*3*7-4*4
97
97*21-16
97*5
=455