Subtract.8x4 - 6x3 + 9x2 + 7
A. 3x4 - 8x3 + 7x2 + 8
B. 13x4 - 4x3 + 11x2 + 8
C. 3x4 - 4x3 + 11x2 + 6
D. 13x4 - 4x3 + 11x2 + 6
Answer: A
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Solve the problem.Betsy can ride her bike 24 miles in 4 hours. How many miles can she ride in 2 hours?
A. 12 miles B. 48 miles C. 3 mile(s) D. 6 miles
Find the first term and the common difference of the arithmetic sequence described. Give a formula for the nth term of the sequence.10th term is 23; 16th term is 25
A. a = 20; d = 
; an = 
n + 
B. a = 14; d = 3; an = 3n + 11
C. a = 20; d = - 
; an = 
n - 
D. a = 20; d = - 
; an = 
n - 20
Solve the system of equations by using the inverse of the coefficient matrix if it exists and by the echelon method if the inverse doesn't exist. 4x + 4y = 4 3x + 9y = 27
A. (-3, -4) B. (4, -3) C. (-3, 4) D. No inverse, no solution for system
Solve the problem.The following table shows the median number of hours of leisure time per week for Americans in various years.
Let f(t) be the median number of hours of leisure time at t years since 1993. The data can be modeled by the quadratic model 
Use the model to estimate the year when the median number of hours of leisure time was the smallest.
A. 2009 B. 2008 C. 2007 D. 2006