<span>-5√x = -15
</span><span>√x = -15/-5
</span><span>√x = 3
x = 3&2
x = 9
answer is </span><span>D. x = 9</span>
They bought 5 trophies total
1st trophy cost $37.50
($18.50+$12.50+$4+$2.50=$37.50)
Each additional trophy cost $15
($12.50+$2.50=$15)
They spent $97.50 total
$97.50-$37.50=$60
Additional trophies $15
$15*X=$60
4 trophies=$60+$37.50 for 1st trophy
$60+$37.50=$97.50