Simplify the expression.
A. 
B. 
C. 
D. Cannot be simplified
Answer: D
Mathematics
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For the points P and Q, find the coordinates of the midpoint of the segment PQ.P(5, 9), Q(7, 1)
A. (-2, 8)
B. (12, 10)
C. 
D. 
Mathematics
Solve the quadratic equation by completing the square.x2 + 18x + 71 = 0
A. x = -18 + 
B. x = 9 + 
C. x = 9 ± 
D. x = -9 ± 
Mathematics
Solve the formula for the specified variable.S = 2?rh + 2?r2 for h
A. h = 
B. h = S - r
C. h = 2?(S - r)
D. h = 
- 1
Mathematics
The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = 
A. y2 = 25 - 10x B. x2 = 25 - 10y C. x2 = 10y - 25 D. y2 = 10x - 25
Mathematics