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 93% of the isotope left?
A. 700 yr
B. 350 yr
C. 363 yr
D. 253 yr
Answer: C
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Write an expression in terms of the given variable(s) that represents the indicated quantity.The amount of money in cents in a jar containing n nickels and some dimes and some quarters if there are 3 times as many dimes as nickels and twice as many quarters as dimes.
A. 85x cents B. 175x cents C. 110x cents D. 185x cents
Find all solutions to the equation.sin x = 
A. x = 
+ 2n?, for integers n
B. x = 
+ 2n?, x = 
+ 2n?, for integers n
C. x = 
+ 2n?, for integers n
D. x = 
+ 2n?, x = 
+ 2n?, for integers n
Solve the problem.Suppose that P(x) represents the percentage of income spent on automobile insurance in year x and I(x) represents income in year x. Determine a function A that represents total automobile insurance expenditures in year x.
A. A(x) = (P ? I)(x)
B. A(x) = (I - P)(x)
C. A(x) = (P + I)(x)
D. A(x) = 
(x)
Solve the problem.Find cos 
, given that cos ? = - 
and ? terminates in 90° < ? < 180°.
A. - 
B. 
C. 
D. - 