Solve.The linear speed L of a grinding wheel in feet per minute (fpm) is given by the formula 
where d is the diameter of the wheel in inches and r is the rotational speed in revolutions per minute (rpm). What rotational speed is needed for a 4.0-inch grinding wheel to generate a linear speed of 3800 fpm? Use 
(Round to the nearest hundred rpm.)
A. 3900 rpm
B. 10,000 rpm
C. 11,000 rpm
D. 3600 rpm
Answer: D
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Determine the quadratic function whose graph is given.
A. f(x) = x2 - 6x - 8 B. f(x) = -x2 - 6x + 8 C. f(x) = x2 - 6x + 8 D. f(x) = x2 + 6x + 8
Use the graph to identify domain and range.
A. domain: (0, ?) range: (-?, ?) B. domain: (0, ?) range: (0, ?) C. domain: (-?, ?) range: (-?, ?) D. domain: (-?, ?) range:(0, ?)
Use a graphing utility to approximate to two decimal places any solutions on [0, 2?) graphically or numerically.ex = -sin x + 2
A. x = 0 B. x = 1.05 C. no solution D. x = 0.45
Given the set sketched on the number line, identify the type of interval (open, closed, half-open, open infinite, closed infinite), write the set using set-builder notation, and write the set using interval notation.
A. closed infinite interval; {x|x ? -6}; [-6, ?) B. open infinite interval; {x|x > -6}; (-6, ?) C. closed infinite interval; {x|x ? -6}; (-?, -6] D. open infinite interval; {x|x < -6}; (-?, -6)