Find the numerical value of the rational expression for the given value of r.
, r = -1
A. 17
B. 0
C. Undefined
D. 
Answer: C
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Use the inverse trig functions to express the angle in terms of the indicated unknown side. ?
Given that y = 7, express angle A in terms of x. Use one of the inverse trig functions tan-1, sin-1, or cos-1.
A. A = tan-1 
B. A = tan-1 
C. A = sin-1 
D. A = sin-1 
Solve the problem.Find an equation for the level surface of the function f(x, y, z) = 
that passes through the point 
.
A. x2 + y2 + z2 = 169 B. x + y + z = 13 C. x2 + y2 + z2 = 13 D. x + y + z = ± 13
Use a proportion to solve the problem.On a map of the Fox River, 1 centimeter represents 3 kilometers. If a trail by the river is actually 13.80 kilometers long, what is the length of the trail on the map?
A. 10.8 cm B. 6.6 cm C. 5.8 cm D. 4.6 cm
Round to the nearest thousand.7546
A. 7550 B. 7500 C. 8000 D. 9000