Solve the system of equations by the substitution method.y = 
x - 2y = 
x + 12
A. {(-60, -12)}
B. {(12, 0)}
C. 
D. {(-60, 12)}
Answer: A
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Solve the problem. Round your result to an appropriate number of significant digits.A line from the top of a cliff to the ground passes just over the top of a pole 5.0 ft high and meets the ground at a point 6.0 ft from the base of the pole. If the point is 78 ft from the base of the cliff, how high is the cliff?
A. 0.40 ft B. 0.00 ft C. 70 ft D. 65 ft
Using the Divergence Theorem, find the outward flux of F across the boundary of the region D.F = sin yi + xzj + 4zk ; D: the thick sphere 1 ? x2 + y2 + z2 ? 4
A. 32?
B. 112?
C. 
?
D. 
?
Solve the problem.In a chemistry class, 5 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 2.5 liters B. 5 liters C. 1.5 liters D. 3.5 liters
Evaluate.i15
A. i B. -1 C. 1 D. -i