Use the formula for the general term (the nth term) of an arithmetic sequence to find the indicated term of the sequence with the given first term, a1, and common difference, d.Find a8 when a1 = -9, d = -4.
A. 23
B. -41
C. 19
D. -37
Answer: D
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At one high school, students can run the 100-yard dash in a mean of 15.2 seconds with a standard deviation of 0.9 seconds. The times are very closely approximated by a normal curve. Rounding to the nearest tenth of a percent as necessary, find the percent of times that are:Between 15.2 and 16.1 seconds
A. 34% B. 68% C. 13.5% D. 50%
Simplify the radical expression. Assume that all variables represent positive real numbers.
A. 5k3q4 
B. 5k7q8 
C. 5k3q4 
D. 5q4 
Solve the system of equations graphically, if a solution exists.4x + y = 6 x + 4y = 9
A. x = -1, y = 2 B. x = 2, y = -2 C. x = 1, y = 0 D. x = 1, y = 2