Answer:
5x² + 2x - 15 = 0
Step-by-step explanation:
Given
= 2x +
Multiply through by 5x ( common denominator )
30 = 10x² + 4x ( subtract 30 from both sides )
0 = 10x² + 4x - 30 ( divide through by 2 )
0 = 5x² + 2x - 15 , that is
x^2+2x-15=0
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the answer is A
22 minutes
40--15 =40+15=55
55/2.5=22
5,280 * 8 = 42,240
42,240 feet
42,240 * 12 = 506,880
506,880 inches