Solve the problem.Let x represent the number of gallons of gas sold at $1.40 per gallon, and let y represent the total cost of the gasoline (in dollars). Write an equation for this situation.
A. y = 1.40 + x
B. x = 1.40y
C. x = 1.40 + y
D. y = 1.40x
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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Simplify. Assume that all variables represent positive numbers.
A. 
B. 1
C. 
D. 
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Select the augmented matrix for the system of linear equations.
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?
A. ?
B. 
C. ?
D. ?
E. ?
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Evaluate.(-8)3
A. 512 B. -522 C. -502 D. -512
Mathematics