An employee received a raise of $15,000 and now ears $90,000 what was porcent increase?

$90000-$15000=$75000 which was his old pay.
$90000/$75000 = 1.2
1.2-1=0.2
0.2*100=20%

How many edges does a pentagonal prisim have?

2n=-4-18

What is the sum of 4/9 and 3/4 in lowest terms

solve for n 1/4 +5/6=n reduce to lowest terms