Solve the problem by writing an appropriate system of equations and using the inverse of the coefficient matrix to solve the system.The sum of the ages of Art, Ben, and Cal is 59. Art is 1 year older than Cal and Cal is 1 year younger than Ben. Which of these people were teenagers 7 years ago?
A. Art, Ben, and Cal
B. Ben
C. Art and Ben
D. Art
Answer: C
Mathematics
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Rewrite with positive exponents, and simplify, if possible.
A. 
B. p5/4
C. p4/5
D. 
Mathematics
Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.3 + 12 + 27 + . . . + 108
A. 
B. 
C. 
D. 
Mathematics
Find an equation in slope-intercept form of the line satisfying the specified conditions.Parallel to the graph of 5x + 7y = 2 with y-intercept (0, -1)
A. y = - 
x - 1
B. y = 
x - 1
C. y = 
x - 1
D. y = - 
x - 1
Mathematics
Find the area of the specified region.Shared by the cardioids r = 3(1 + sin ?) and r = 3(1 - sin ?)
A. 
(5? + 8)
B. 169
C. 
(3? - 8)
D. 
(3? + 8)
Mathematics