Add or subtract as indicated.-4 + 7 - (-18)
A. -15
B. -21
C. 21
D. -29
Answer: C
Mathematics
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Graph the equation and give the coordinates of the vertex.y = -4x2 - 40x - 97
A. (5, 3)
B. (-3, 5)
C. (3, -5)
D. (-5, 3)
Mathematics
Write the integral that gives the surface area generated when the curve is revolved about the x-axis. Do not simplify.y = tanx on 
A. 2?
dx
B. 
dx
C. 
dx
D. 2?
dx
Mathematics
Solve the equation. Give an exact solution.log5(x + 7) + log5(x - 7) = 1
A. 
B. 5
C. 54
D. 3
Mathematics
Solve the equation by completing the square.9x2 + 2x - 7 = 0
A. 
, 0
B. 
, -1
C. 
, -1
D. 
, 1
Mathematics