Solve the problem.A geometric progression is a sequence of terms in which each term is r times the preceding term. The sum of the first three terms of such a sequence, where a is the first term, is given by the expression 
. Under what circumstances, if any, is this expression undefined?
A. The expression is undefined for r = -1
B. The expression is undefined for r = 1
C. The expression is defined in all circumstances.
D. The expression is undefined for r = 0
Answer: B
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Determine whether the given point is in the solution set to the given system.
9x - 9y - 6z = -116x + 3y - 3z = 1 x - y + 2z = -3
A. No B. Yes
Graph the equation.4y2 - x2 = 4
A. 
B. 
C. 
D. 
Solve the problem. Round your answer to the nearest tenth, if necessary.Bill can row 3 mph in still water. It takes him 3 hr 36 min to go 3 mi upstream and then return. Find the speed of the current.
A. 2.5 mph B. 2 mph C. 3 mph D. 1.5 mph
Solve the problem.The length a spring is stretched from its natural length with work, W
is given by L = 
where k is a constant for the given spring. If a certain spring has a constant of 65.7, and the spring is to be stretched 2.6 feet from its natural length, how much work will be necessary? Round to the nearest tenth of a foot-pound.
A. 444.1 foot-pounds B. 85.4 foot-pounds C. 222.1 foot-pounds D. 53 foot-pounds