Answer:
no cap just plug in each one into a quadratic formula and if thats to difficuly just look up symbolab and plug it in
Step-by-step explanation:
20 inches and 4.2 calameders
x=3
3x-6x+7=-2
subtract 7 from both sides
3x-6x=-9
-3x=-9
3x=9
$900 before tax
1200 x 0.25 = 300
1200 - 300 = 900