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. 600 years
B. 309 years
C. 300 years
D. 256 years
Answer: B
Mathematics
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Solve the problem.The width of a rectangle is 6 kilometers less than twice its length. If its area is 176 square kilometers, find the dimensions of the rectangle.
A. length = 8 km, width = 10 km
B. width = 11 km, length = 16 km
C. length = 3 km, width = 
km
D. length = 11 km, width = 16 km
Mathematics
Solve the system using substitution.
A. no solution B. (0, -5) C. (0, -4) D. (-1, -4)
Mathematics
Multiply by powers of 10.0.7848 × 104
A. 784.8 B. 1000.7848 C. 0.78480000 D. 7848
Mathematics
Divide.
A. x + 121 B. x - 11 C. x2 - 11 D. x - 121
Mathematics