8x - 12 = 4x
8x - 4x = 12
4x = 12
x = 12/4
x = 3
90x^2+15x-30 (hope this helps)
Im pretty sure she has 6 quarters and 12 nickels since it it twice as much.
$0.25 x 6 =150
$0.5 x 12 =60
total = 210
Answer:
55
Step-by-step explanation:
Divide both sides by 3.14 to get d by itself.
172.7 / 3.14 = 55 = d