Solve for the specified variable.
+ 
= 
for c
A. c = a + b
B. c = 
C. c = ab(a + b)
D. c = 
Answer: D
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Solve the problem.Find the x-coordinate of the vertex of a parabola passing through the points (0, 4) and (8, 4).
A. 8 B. 4 C. 3 D. 5
Solve the problem.One version of the formula for calculating the distance that a bullet travels when shot at an initial velocity of 1000ft/sec over a period of time t, in seconds, is d = 
(?32)t2 + 1000t. Use this formula to find the distance the bullet travels after 4 seconds.
A. 3744 ft B. 3488 ft C. 3936 ft D. 4256 ft
Factor by grouping.2y - 8 + xy - 4x
A. (x - 4)(2y + x) B. (y - 4)(2 + x) C. (x - 4)(y + 2) D. (y - 4x)(2 + x)
Find an equation of a parabola satisfying the given conditions.Focus at (-10, -10), directrix x = -12
A. (x + 10)2 = 4(y + 10) B. (x + 10)2 = 4(y + 11) C. (y + 10)2 = 4(x + 10) D. (y + 10)2 = 4(x + 11)