Solve the problem.Let f(x) = x2 + 3x - 21. Find a so that f(a) = 19.
A. {-8, -5}
B. {8, 5}
C. {-8, 5}
D. {8, -5}
Answer: C
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Verify the identity.
= - 
What will be an ideal response?
Use Gauss-Jordan elimination to find the solution. Write the solution as an ordered triple.-5x - y + 8z = 28-4x + 7y - 2z = 35-9x - 5y + z = -39
A. (1, 7, 5) B. (-1, 5, 7) C. (1, 5, 7) D. (-1, 7, 2)
Solve the problem.The perimeter of a rectangle is 46 feet. Describe the possible lengths of a side if the area of the rectangle is to be greater than 120 square feet.
A. The length of the rectangle must lie between 8 and 15 ft B. The length of the rectangle must lie between 1 and 120 ft C. The length of the rectangle must be greater than 15 ft D. The length of the rectangle must be greater than 15 ft or less than 8 ft
Determine whether f is continuous at c.f(x) = 
; c = 0
A. not continuous B. continuous