Find the perimeter. Use 3.14 for ? when needed.
A. 12.56 ft
B. 6.28 ft
C. 20.56 ft
D. 14.28 ft
Answer: C
Mathematics
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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 94% of the isotope left?
A. 256 years B. 600 years C. 300 years D. 309 years
Mathematics
Multiply. 
A. 38,603,831 B. 38,604,831 C. 38,604,931 D. 38,614,831
Mathematics
Perform the indicated operations. Assume that all variables represent nonnegative real numbers.
- 
A. 3 - 4
B. 4
- 3
C. 3
- 4
D. 7
Mathematics
Find the product, and write in lowest terms, if necessary.
? 
A. 
B. 
C. 
D. 
Mathematics