Solve the problem.A certain radioactive isotope decays at a rate of 0.15% annually. Determine the half-life of this isotope, to the nearest year.
A. 201 yr
B. 5 yr
C. 462 yr
D. 333 yr
Answer: C
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Find the first four terms of the binomial series for the given function.(1 + 7x)1/2
A. 1 - 
x + 
x2 - 
x3
B. 1 + 
x - 
x2 + 
x3
C. 1 - 
x + 
x2 - 
x3
D. 1 + 
x - 
x2 + 
x3
Determine if matrix A is invertible.A = 
A. Not invertible B. Invertible
Find the missing value. Round time to the nearest period, interest rate to the nearest whole percent per year, and money to the nearest cent.Principal: 
Compound amount: $58,825Interest rate: 6%Compounded: annuallyTime: 7 years
A. $39,121.98 B. $39,055.48 C. $41,805.83 D. $36,633.25
Solve the problem.A circular hole is filled with concrete to make a footing for a load-bearing pier. The hole measures 17 inches across and requires 1.6 bags of concrete in order to fill it to ground level. What is the depth of the hole? Round your answer to the nearest inch. (One bag of concrete, when mixed with the appropriate amount of water, makes 1800 in.3 of material.)
A. 10 in. B. 13 in. C. 17 in. D. 19 in.