Solve the system by the addition method. Be sure to check all proposed solutions. x + 9y = 15-3x + 8y = 25
A. {(-4, 3)}
B. {(3, 3)}
C. {(-3, 2)}
D. ?
Answer: C
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Solve the problem.A lake lies between A and C, and lines AB and DE run north-south. If 
and 
how far is it from A to C? Round to the nearest tenth.
A. 11.4 mi B. 5.0 mi C. 3.5 mi D. 4.8 mi
Write the fraction as a decimal.
A. 
B. 
C. 
D. 
Write as the sum and/or difference of logarithms. Express powers as factors.ln 
2/3, x > 9
A. ln (x + 2) + ln (x - 9) + ln 2 - 4ln (x - 5) - ln 3
B. 
ln (x2 + 11x - 18) - 
ln (x - 5)
C. 2ln (x + 2) - 3ln (x - 9) - 
ln (x - 5)
D. 
ln (x + 2) + 
ln (x - 9) - 
ln (x - 5)
Solve the problem.The rate of expenditure for maintenance of a particular machine is given by M'(x) = 12x
, where x is time measured in years. Total maintenance costs through the second year are $73. Find the total maintenance function.
A. M(x) = 4(x2 + 5)3/2 - 35 B. M(x) = 12(x2 + 5)3/2 + 61 C. M(x) = 12(x2 + 5)3/2 - 35 D. M(x) = 4(x2 + 5)3/2 + 61