Find the solutions to the system of equations by the addition method.
x + 
y = -1 x - y = 6
A. (2, -4)
B. (1, -3)
C. (1, -4)
D. (-2, -3)
Answer: A
Mathematics
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Solve the problem.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 4% cement should he mix with 5 bags of 18.4% cement to produce a mix containing 10% cement?
A. 17 bags B. 7 bags C. 9 bags D. 12 bags
Mathematics
Find zw or 
as specified. Leave your answer in polar form.z = 10(cos 45° + i sin 45°)w = 5(cos 15° + i sin 15°)Find zw.
A. 5(cos 30° + i sin 30°) B. 5(cos 60° + i sin 60°) C. 50(cos 60° + i sin 60°) D. 50(cos 30° + i sin 30°)
Mathematics
Find the inverse of the one-to-one function.f(x) =
A. f-1(x) = 
B. f-1(x) = x3 + 5
C. f-1(x) = x + 5
D. f-1(x) = x3 + 25
Mathematics
Evaluate the variable expression x + y for x = 62.52 and y = –43.92.
A) 106.44 B) –106.44 C) –18.60 D) 106.54 E) 18.60
Mathematics