Find the focus and directrix of the parabola with the given equation.y2 = -28x
A. Focus: (7, 0), directrix: x = -7
B. Focus: (-7, 0), directrix: x = 7
C. Focus: (0, -7), directrix: y = 7
D. Focus: (0, 7), directrix: y = -7
Answer: B
Mathematics
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Write a chain rule formula for the following derivative.
for u = f(r, s, t); r = g(y), s = h(z), t = k(x, z)
A. 
= 
B. 
= 
C. 
= 0
D. 
= 
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Solve.A musician plans to perform 5 selections for a concert. If he can choose from 8 different selections, how many ways can he arrange his program?
A. 6720 B. 32,768 C. 56 D. 40
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Factor the trinomial completely.48x2 + 40x - 48
A. 8(3x - 2)(2x + 3) B. (24x + 16)(2x + 3) C. 8(3x + 2)(2x + 3) D. Prime
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Solve the equation.
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Mathematics