Solve the problem.Strontium 90 decays at a constant rate of 2.44% per year. Therefore, the equation for the amount P of strontium 90 after t years is P = P0 e-0.0244t. How long will it take for 15 grams of strontium to decay to 5 grams? Round answer to 2 decimal places.
A. 45.03 years.
B. 4.50 years
C. 40.50 years
D. 450.25 years
Answer: A
Mathematics
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Solve the problem.One dimension of a rectangular solid is represented by 3x units. The volume of the solid is 
cubic units. Express each of the other two dimensions of the rectangular solid in terms of x.
A. (6x - 4) and (2x - 5) B. (2x + 4) and (6x - 5) C. (2x - 4) and (6x - 5) D. Not enough information is given.
Mathematics
Evaluate the given integral by using three terms of the appropriate series, rounding the result to four decimal places.
A. 0.1216 B. 0.5877 C. 0.5620 D. 0.1801
Mathematics
Use the pattern in the sequence or chart to find the missing number.-2, 1, 4, 7, 10, 
A. 12 B. 8 C. 16 D. 13
Mathematics
Solve the equation.
+ 
= 4
A. {-3}
B. 
C. {3}
D. ?
Mathematics