An overhead garage door has two springs, one on each side of the door (see figure). A force of 
pounds is required to stretch each spring 1 foot. Because of a pulley system, the springs stretch only one-half the distance the door travels. The door moves a total of 
middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_62f6d42c72c2489b86d5734dd" /> feet, and the springs are at their natural length when the door is open. Find the combined lifting force applied to the door by the springs when the door is closed.
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A. 
B. 
C. 
D. 
E. 
Answer: B
Mathematics
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Simplify.(42)4
A. 32 B. 10 C. 4096 D. 65,536
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Factor.8n2 + 31n - 45
A. (8n - 54)(8n - 9) B. (8n - 9)(n + 5) C. (8n - 9)(n - 5) D. (8n - 9)(9 - 8n)
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Use transformations to graph the function.y = -4 sin x
A. 
B. 
C. 
D. 
Mathematics
Calculate the average rate of change of the given function over the interval 
.
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A. 6 B. 14 C. 8 D. 10 E. 18
Mathematics