Solve the system by substitution.2x - 5y = -309x + 7y = 101
A. {(-6, -2)}
B. {(5, 8)}
C. {(-5, 8)}
D. ?
Answer: B
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Solve the problem.A plane is flying over the ocean at a height of 11,210 feet above sea level. The depth of the ocean directly below the plane is 16,074 feet. How high is the plane above the ocean floor?
A. 4964 feet B. 27,384 feet C. 27,284 feet D. 4864 feet
Solve.When Maria finished medical school she owed $51,000 in student loans. She repaid 
of the total amount within two years of graduating. How much did she repay within two years of graduating?
A. $3400 B. $37,400 C. $34,000 D. $30,600
Find a formula for the nth partial sum of the series and use it to find the series' sum if the series converges.
+ 
+ 
+ ... + 
+ ...
A. 
; 4
B. 
; 2
C. 
; 2
D. 
; 4
Solve the problem.A certain radioactive isotope decays at a rate of 0.275% annually. Determine the half-life of this isotope, to the nearest year.
A. 109 years B. 252 years C. 182 years D. 3 years