Simplify the radical. Assume that all variables represent positive real numbers.
A. x2
B. x
C. x2
D. x2
Answer: C
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Solve the equation by making an appropriate substitution.x1/2 - 13x1/4 = -36
A. {81, 16} B. {6561, 256} C. {9, 4} D. {-9, -4}
If f is a differentiable function, find an expression for the derivative of 
Select the correct answer.
Provide an appropriate response.If z = exy and x = 
; y = ln (r + s) find:(a) 
(b) 
What will be an ideal response?
Solve the problem.A conservation officer needs to know the width of a river in order to set instruments correctly for a study of pollutants in the river. From point A, the conservation officer walks 105 feet downstream and sights point B on the opposite bank to determine that ? = 50° (see figure). How wide is the river (round to the nearest foot)? 
A. 163 ft B. 125 ft C. 80 ft D. 88 ft