Solve the problem.A nuclear scientist has a sample of 
of a radioactive material which has a half-life in hours. She monitors the amount of radioactive material over a period of a day and obtains the following data. Use a graphing utility to fit an exponential function to the data. Predict the amount of material remaining at 40 hours.
.
A. y = 92e-0.0686x, 5.9 mg
B. y = 86e-0.071x, 5.0 mg
C. y = 100e-0.077x, 4.6 mg
D. y = 100e-0.077x, 6.7 mg
Answer: C
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Provide an appropriate response.If A = 
; B = 
, then find (A + B)T.
What will be an ideal response?
Let matrix A represent the sales (in thousands of dollars) of a toy company in 1994 in three cities, let B represent the sales in the same cities in 1995, and let C represent the sales in the same cities in 1996. 
A = 
; B = 
; C = 
What is the change in sales between 1995 and 1996?
What will be an ideal response?
Solve the problem.City A is due north of City B. Find the distance between City A (north latitude 35° 28' N) and City B 
Use 3960 miles as the radius of the Earth.
A. ?1590 mi B. ?1292 mi C. ?496 mi D. ?1559 mi
Write an equation in slope-intercept form of a line satisfying the given conditions.Slope - 
; y-intercept 3
A. y = 
x + 3
B. y = - 
x + 3
C. y = - 
x - 3
D. y = 
x - 3