Answer:
30 mm
Step-by-step explanation:
Formula: A = 1/2bh
Substitution: 240 = 1/2b • 16
Solving:
240 = 8b
240 = 8 • <u>3</u><u>0</u>
b = 30 mm
2²+2x-4=o
4-4+2x=0
2x=0
x=0/2=0