Use the given information to find the exact value.cos A = 
, 0 < A < 
; sin B = - 
, 
< B < 2?
Find cos (A + B).
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Solve the system by elimination.-7x + 8y = -16-4x + 6y = -12
A. (0, -1) B. No solution C. (-1, -1) D. (0, -2)
Mathematics
Solve the problem.A quality-control inspector examined 290 calculators and found 15 of them to be defective. At this rate, how many defective calculators will there be in a batch of 15,370 calculators?
A. 4 calculators B. 53 calculators C. 795 calculators D. 4350 calculators
Mathematics
Determine the number that will complete the square. Check by multiplying.x2 + 
x + 
A. 
B. 
C. 
D. 
Mathematics
Solve and graph.-38 ? 7x + 4 and 4x - 1 < -9
A. [-6, -2]
B. (-6, -2)
C. [-6, -2)
D. (-6, -2]
Mathematics