Evaluate the expression x - y for the given values of the variables.x = 6.3, y = 0.85
A. 5.45
B. 5.35
C. 7.15
D. -5.45
Answer: A
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Solve the problem.In 1990, the population of a country was estimated at 4 million. For any subsequent year the population, P(t) (in millions), can be modeled by the equation 
where t is the number of years since 1990. Estimate the year when the population will be 21 million.
A. approximately the year 2088 B. approximately the year 2093 C. approximately the year 2041 D. approximately the year 2016
Find the slope of the line.
A. 6 B. -6 C. -1 D. 1
Solve the problem.From 8 names on a ballot, a committee of 5 will be elected to attend a political national convention. How many different committees are possible?
A. 6720 B. 56 C. 3360 D. 336
Find the inverse of the matrix (if it exists).
?
?
A. ?
B. ?
C. ?
D. ?
E. ?