Simplify the expression by multiplying. 2(-4ab)
A. 2ab
B. -2ab
C. 8ab
D. -8ab
Answer: D
Mathematics
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Write the standard equation for the circle.Center at (-2, 9), radius 
A. (x + 9)2 + (y - 2)2 = 9 B. (x - 9)2 + (y + 2)2 = 9 C. (x + 2)2 + (y - 9)2 = 3 D. (x - 2)2 + (y + 9)2 = 3
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Solve the problem.160 trains is what percent of 1870 trains?
A. 1168.8% B. 0% C. 8.6% D. 0.1%
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Find the unknown value.What percent of 10 is 
?
A. 7% B. 10% C. 5.5% D. 5%
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Rewrite f(x) = (ax + b)/(x + c) in f(x) = a + d/(x + c) form.f(x) = 
A. f(x) = 1 - 
B. f(x) = 1 - 
C. f(x) = 1 + 
D. f(x) = 1 + 
Mathematics