Provide an appropriate response.Initially, three are 50 milligrams of a radioactive substance. The substance decays according to the equation N = 50e-0.01t, where N is the number of milligrams present after t hours. The number of hours it takes for 10 milligrams to remain is
A. 
.
B. - 
.
C. - 
.
D. - 
.
E. 50e-0.1.
Answer: C
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What fraction is represented by the shaded portion of the figure?
A. 
B. 
C. 
D. 
Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = +1.29,; local maximum at x = -1.29; concave up on (0, ?); concave down on (-?, 0) B. Local minimum at x = +1.29,; local maximum at x = -1.29; concave up on (-?, -1.29) and (1.29, ?); concave down on (-1.29, 1.29) C. Local minimum at x = -1.29,; local maximum at x = +1.29; concave up on (-?, -1.29) and (1.29, ?); concave down on (-1.29, 1.29) D. Local minimum at x = +1.29,; local maximum at x = -1.29; concave down on (0, ?); concave up on (-?, 0)
Solve the problem.Jill is 7 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 2 kilometers per hour. They meet in 2 hours. How fast is Joe walking?
A. 3.5 kilometers per hour B. 2.5 kilometers per hour C. 2 kilometers per hour D. 1.5 kilometers per hour
Determine whether the relation is a function.
A. Function B. Not a function