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. 881.45 yr
B. 4407.23 yr
C. 220.36 yr
D. 440.72 yr
Answer: D
Mathematics
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Evaluate the requested trigonometric function using the information given. csc ? = - 
; 3?/2 < ? < 2?Find cos ?.
A. - 
B. 
C. 
D. - 
Mathematics
Solve problems by subtracting whole numbers.Pat is trading her car in on a new car. The new car costs $27,025. Her car is worth $9998. How much more money does she need to buy the new car?
A. $17,017 B. $17,027 C. $17,028 D. $16,927
Mathematics
Add. Write a mixed numeral for the answer.4
+ 8
A. 12
B. 4
C. 13
D. 11
Mathematics
Solve the compound inequality. Write the solution set using interval notation and graph it.-12 < 4b + 4 ? 4
A. [-4, 0]
B. (-4, 0]
C. (-4, 0)
D. [-4, 0)
Mathematics