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 95% of the isotope left?
A. 256 years
B. 500 years
C. 250 years
D. 259 years
Answer: A
Mathematics
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A. 4 thousands + 6 tens + 1 one B. 4 ten thousands + 6 tens + 1 ten C. 4 thousands + 6 hundreds + 1 one D. 4 ten thousands + 6 hundreds + 1 ten
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A. 77° B. 67° C. 103° D. 97°
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Use the data to complete the table.The following is the number of hours students studied per week on average. 
A. Frequency: 2, 4, 5, 4, 5 B. Frequency: 2, 3, 6, 5, 4 C. Frequency: 2, 4, 5, 5, 4 D. Frequency: 2, 4, 4, 6, 4
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Convert the base-ten number to a number in the indicated base.503 to base eight
A. 676eight B. 565eight C. 767eight D. 656eight
Mathematics