Solve the problem.The decay of 243 mg of an isotope is given by 
where t is time in years since the initial amount of 243 mg was present. Find the amount (to the nearest milligram) left after 72 years.
A. 89
B. 45
C. 87
D. 240
Answer: A
Mathematics
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Choose the equation that matches the graph.
A. x2 = -6y B. x2 = 6y C. -6x2 = y D. y2 = -6x
Mathematics
Solve by using the percent proportion 
= 
.488 is what percent of 409?
A. 
= 
; p = 119.32
B. 
= 
; a = 1995.92
C. 
= 
; p = 83.81
D. 
= 
; b = 119.32
Mathematics
Use mathematical induction to prove the following.4n > n
What will be an ideal response?
Mathematics
The following graph shows the monthly sales for Big "D" Sales during 2000 and 2001. Use the graph to solve the problem.
What were the total sales for 2000?
A. $48,000 B. $764,000 C. $582,000 D. $50,000
Mathematics