Solve by the substitution method.0.4x + 0.7y = 2.3 x - 0.9y = -7.5
A. {(-0.3, 0.5)}
B. ?
C. {(-3, 5)}
D. {(5, -3)}
Answer: C
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Solve the problem.The cost to rent a power-wash machine from the hardware store depends on the number of hours the machine is rented. The ordered pair 
indicates that it costs $52 to rent the machine for 2 hours, and the ordered pair 
indicates that it costs $208 to rent it for 8 hours.a) Write a linear equation giving the cost, y, in terms of the number of hours x.b) Use the equation found in part a to find how much it costs to rent for 11 hours.c) How many hours could you rent for a cost of $598?
A. y = 25x; $275; 22 hours B. y = 26x; $286; 23 hours C. y = 28x; $308; 23 hours D. y = 27x; $297; 24 hours
Solve the problem.Mary lives on a corner lot. The neighborhood children have been cutting diagonally across her lawn instead of walking around the yard. If the diagonal distance across the lawn is and the longer part of the sidewalk is twice the shorter length, how many feet are the children saving by cutting across the lawn? Round to the nearest foot if necessary.
A. 40 ft B. 13 ft C. 17 ft D. 10 ft
Write the ratio in fractional notation in lowest terms.19 nickels to 6 dollars
A. 
B. 
C. 
D. 
For the given arithmetic series, what is Sn?a1 = 6, d = 7, and n = 95
A. 31,825 B. 127,300 C. 31,831 D. 63,650