Use the formula for the nth term of a geometric sequence to find the indicated term of the sequence with the given first term, a, and common ratio, r.Find a8 when a = -3, r = 2.
A. -768
B. 11
C. -384
D. -380
Answer: C
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Express the interval in set builder notation and graph the interval on a number line.(-?, 5.5]
A. {
x ? 5.5}
B. {
x ? 5.5}
C. {
x < 5.5}
D. {
x > 5.5}
Multiply.5x(8x2 - 4xy + 5y2)
A. 40x3 + 20x2y + 25xy2 B. 40x3 - 20xy + 25y2 C. 40x3 - 20x2y + 25xy2 D. 40x3y - 4xy + 5y2
Write a system of equations to describe the problem situation. Use guess and check to solve the problem.
A boat travels 12 miles upstream to a fishing spot. The trip takes 1.2 hours. The return trip, downstream, takes 0.8 hour. Find the speed of the current, c. A) c = 2.0 mph B) c = 2.5 mph C) c = 2.8 mph D) c = 3.0 mph E) c = 3.5 mph
Simplify by combining like terms. Write the final answer with descending powers.8 - 10x2 + 4x2 - 4 - 3x
A. -6x2 - 3x + 12 B. -6x2 + 3x + 4 C. -6x2 - 3x + 4 D. -14x2 - 3x + 4