Estimate the sum or difference by first rounding each value to the indicated place value.532.432 - 282.91
round each to the nearest ten
A. 240
B. 260
C. 230
D. 250
Answer: D
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Evaluate the expression.
-3
A. 
B. - 
C. 
D. - 
Determine the absolute and relative unfairness of the given apportionment.State A with a population of 254,000 and 10 representatives or state B with a population of 540,000 and 15 representatives.
A. 25,400; 0.414 B. 10,600; 0.417 C. 10,600; 0.294 D. 36,000; 0.586
Solve the system by the best method. Use set notation to express the solution set.
A. no solution; ? B. {(7, 4)} C. {(4, 7)} D. {(1, 1)}
Suppose a radioactive substance decays according to the formula 
. How long will it take for the substance to decay to half the original amount?
?
A. It will take 5,166 years for the substance to decay to half the original amount. B. It will take 5,277 years for the substance to decay to half the original amount. C. It will take 40 years for the substance to decay to half the original amount. D. It will take 5,622 years for the substance to decay to half the original amount.