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 88% of the isotope left?
A. 639 years
B. 600 years
C. 241 years
D. 1200 years
Answer: A
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Solve the problem.Suppose that an open box is to be made from a square sheet of cardboard by cutting out 
squares from each corner as shown and then folding along the dotted lines. If the box is to have a volume of 108 cubic inches, find the original dimensions of the sheet of cardboard. 
A. 
in. by 3
in.
B. 6
in. by 6
in.
C. 12 in. by 12 in.
D. 6 in. by 6 in.
Divide.
A. 12.3
B. - 
C. 1.23
D. -40
Find the first five terms of the infinite sequence whose nth term is given.an = 3n
A. 9, 27, 81, 243, 729 B. 1, 3, 9, 27, 81 C. 3, 9, 27, 81, 243 D. 1, 8, 27, 64, 125
Use a tree diagram to find the indicated probability.In the town of Cheraw, a certain type of laptop computer is sold at just two stores. Store A has 38% of the sales, 4% of which are of defective items, and store B has 62% of the sales, 2% of which are of defective items. A person receives one of these laptop computers as a gift. What is the probability it is defective?
A. 0.03 B. 0.014 C. 0.42 D. 0.028