Find a formula for the nth term of the arithmetic sequence whose first term a and common difference d are given.a = 20, d = -7
A. an = 7n - 27
B. an = -7n + 20
C. an = -7n + 27
D. an = 7n - 20
Answer: C
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Solve the problem.Sarah and Shakina are running in a 4-lap, 1 mile race. Shakina is exactly one lap behind at the moment when Sarah completes her second lap. If Sarah averages 0.17 miles per minute for her last two laps, what must Shakina's average speed be in order for her to just pull even with Sarah at the finish line?
A. 0.23 mi/min B. 0.26 mi/min C. 0.34 mi/min D. 0.11 mi/min
Solve the given equation.
m = 42
A. m = 
B. m = 3
C. m = 0
D. m = 
Solve the polynomial inequality. Express the solution using interval notation.x2 - 5x - 6 ? 0
A. (-?, -1] B. [-1, 6] C. (-?, -1] ? [6, ?) D. [6, ?)
Simplify the radical. Assume that all variables represent nonnegative real numbers. 
, n ? 0
A. 
B. 
C. 
D. 