Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.3% annually. Determine the half-life of this isotope, to the nearest year.
A. 167 yr
B. 100 yr
C. 2 yr
D. 231 yr
Answer: D
Mathematics
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Evaluate the integral.
A. 
B. 
C. 
D. 
Mathematics
Determine whether the relation is a function.Tips earned by servers at a restaurant one evening:
A. A function B. Not a function
Mathematics
Write the sentence as an equation with x as the input, or independent, variable and y as the output, or dependent, variable. The output is five less than seven times the input.
A) y = 7x + 5 B) y = 7x - 5 C) y = 5x - 7 D) y = 5 - 7x E) y = 5 < 7x
Mathematics
Write out the first five terms of the sequence.an = 
A. 
, 
, 
, 
, 
B. 1, 
, 
, 
, 
C. 3, 
, 
, 
, 
D. 1, 
, 
, 
, 
Mathematics