Solve the problem.The spring of a spring balance is 7.0 in. long when there is no weight on the balance, and it is 9.4 in. long with 9.0 lb hung from the balance. How much work is done in stretching it from 7.0 in. to a length of 10.6 in.?
A. 120 lb?in.
B. 24 lb?in.
C. 1.7 lb?in.
D. 6.8 lb?in.
Answer: B
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Write the rational expression as an equivalent expression with the indicated denominator.
= 
A. 
B. 
C. 
D. 
Find the probability.In a batch of 8,000 clock radios, 7% are defective. A sample of 10 clock radios is randomly selected without replacement from the 8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch will be rejected?
A. 0.100 B. 0.516 C. 0.484 D. 0.0700
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 90% of the isotope left?
A. 527 yr B. 246 yr C. 1000 yr D. 500 yr
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 92% of the isotope left?
A. 251 years B. 800 years C. 417 years D. 400 years