Solve.There are currently 63 million cars in a certain country, decreasing by 2.8% annually. How many years will it take for this country to have 41 million cars? Round to the nearest year.
A. 3 yr
B. 8 yr
C. 110 yr
D. 15 yr
Answer: D
Mathematics
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Write the fraction as a percent. If necessary, round the percentage to the nearest tenth.
A. 500% B. 5.8% C. 29% D. 58%
Mathematics
Simplify the complex fraction.
A. 
B. 
C. 
D. 
Mathematics
Estimate the product by first rounding each number so that there is one nonzero digit.35 × 55
A. 240 B. 24 C. 4800 D. 2400
Mathematics
Solve the problem.The time required for workers to produce each unit of a product decreases as the workers become more familiar with the production procedure. It is determined that the function for the learning process is 
where T(x) is the time, in hours, required to produce the xth unit. Find the time required for a new worker to produce units 10 through 16.
A. 32.83 hr B. -3.86 hr C. 12.14 hr D. 30.83 hr
Mathematics