?Solve the system of linear equations by the method of elimination, find (x,y).
?
?
?
A. ?(4, -43)
B. (a, -7 - 9a) ?(infinitely many solutions)
C. ?(2, -25)
D. ?No solutions
E. ?(8, -79)
Answer: B
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Estimate the magnitude of the error involved in using the sum of the first four terms to approximate the sum of the entire series.
A. 
< 3.24 × 10-2
B. 
< 7.78 × 10-2
C. 
< 7.78 × 10-3
D. 
< 1.56 × 10-2
Use Webster's method to find the apportionment.A small country consists of seven states; there are 160 seats in the legislature that need to be apportioned among the seven states; and the population of each state is shown in the table.
Find the apportionment for state D using Webster's method.
A. 25 B. 24 C. 26 D. 23
Solve the problem.At the end of 9 mo, the balance of an account earning annual simple interest is $9270. If at the end of 15 mo the balance is $9450, how much money was originally in the account?
A. $8970 B. $9030 C. $8940 D. $9000
Solve the system by graphing.
?
?
?
A. 
B. 
C. 
D. 
E. inconsistent