Solve the system by elimination.
- 
= -18
+ 
= -9
A. {(-12, 0)}
B. {(0, 12)}
C. {(0, -12)}
D. {(12, 0)}
Answer: A
Mathematics
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Provide an appropriate response.Solve the system of equations using the addition method:3x - 2y = 142x + 5y = 3
A. inconsistent; no solution B. x = 11.5, y = 4 C. dependent; many solutions D. x = 4, y = -1
Mathematics
Find the sum of the geometric series.
A. 22 B. 186 C. 42 D. 255
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The function f is one-to-one. Find its inverse.f(x) = 
A. f-1(x) = (x - 7)2
B. f-1(x) = x2 - 7, x ? 0
C. f-1(x) = 
D. f-1(x) = x2 + 7, x ? 0
Mathematics
Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for x = 10? Round your answer to the nearest hundredth, if necessary.
A. $11,025.00 B. $478.72 C. $11,250.00 D. $50.00
Mathematics