Solve the system by substitution. 3x - 13 = -y2x + 9y = -8
A. {(-5, 2)}
B. {(-5, -2)}
C. {(5, 2)}
D. {(5, -2)}
Answer: D
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A balloon is initially full of air, but then it springs a leak. Air leaks at a constant rate from the balloon. After a while the leak is patched and a pump is attached to the balloon. It is re-inflated to its original volume: Air is pumped at a constant rate that is larger than the rate of the leak. Let B denote the volume, in cubic inches, of air in the balloon after t minutes. The graph of B versus t from the time the balloon springs a leak until it is fully re-inflated is shown. Make the graph of 
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What will be an ideal response?
Refer to this figure to answer the question. Line DH is parallel to line IM. Line BO is perpendicular to line DH. 
m(?IJN) is 49°. What is the measure of ?JEF?
A. 49° B. Can't determine C. 41° D. 131°
Solve the problem.The amount of tin A (in square inches) needed to make a tin can with radius r inches and volume 25 cubic inches can be found by the function 
Find the difference quotient when r = 2.6 in. and 
Use 3.14 for ?. Interpret the result.
A. At r = 2.6 in., A is decreasing at 26.2 in.2 per 1 in. increase in r. B. At r = 2.6 in., A is increasing at 262 in.2 per 1 in. increase in r. C. At r = 2.6 in., A is decreasing at 262 in.2 per 1 in. increase in r. D. At r = 2.6 in., A is increasing at 26.2 in.2 per 1 in. increase in r.
Find the quotient.
A. 52 B. 0 C. Undefined D. 1