Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 85% of the isotope left?
A. 1,500 yr
B. 813 yr
C. 234 yr
D. 750 yr
Answer: B
Mathematics
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Solve the problem.The number of bacteria growing in an incubation culture is given by 
where x is time in days. Find the number of bacteria when x = 0 and x = 5.
A. 2300, 62,100 B. 2300, 34,500 C. 2300, 558,900 D. 6900, 558,900
Mathematics
Solve the problem.An invoice is received from Westminster Office Machines for $305.30 with terms of 4/11 and dated 
AS OF Mar 1. If a partial payment of $190 is made on Mar 9, find the balance due on the invoice.
A. $107.38 B. $115.30 C. $103.09 D. $197.92
Mathematics
Decide whether the given functions are inverses.
?
A. Yes B. No
Mathematics
Solve.?5x + 4? = 8
A. - 
, 
B. - 3, 1
C. No solution
D. - 
, 
Mathematics