Solve the problem.A box contains a radioactive substance. The number of kilograms r(t) at time t years is given by the formula 
How long will it take until only one-half kilogram of the radioactive substance is left in the box?
A. 490.44 yr
B. 245.22 yr
C. 4904.36 yr
D. 980.87 yr
Answer: A
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Provide an appropriate response.The monthly cost of a certain texting plan is given by the function C(n) = 0.05n + 9.95, where C(n) is in dollars and n is the number of texts sent in a month. Find and interpret C(140) Monthly Cost of Texting Plan
A. 7.00; it costs $7.00 to send 140 texts in a month using a certain texting plan. B. 15.95; it costs $15.95 to send 140 texts in a month using a certain texting plan. C. 16.95; it costs $16.95 to send 140 texts in a month using a certain texting plan. D. 23.95; it costs $23.95 to send 140 texts in a month using a certain texting plan.
Solve the problem.A travel agent arranged a payment plan for a client. It required a down payment of 
and 12 monthly payments of 
What was the total cost of the plan?
A. $8012 B. $8112 C. $7812 D. $7912
List the elements in the sample space of the experiment.A group of 18 people are assigned numbers 1 through 18. List the sample space of the event choosing a person with a number 5 or less.
A. {1} B. {18} C. {1, 2, 3, 4} D. {1, 2, 3, 4, 5}
Perform the indicated operation. Where possible, reduce the answer to its lowest terms.
+ 
A. 
B. 
C. 
D. 