Solve by the substitution method.0.4x + 0.6y = -2.4 x - 0.6y = -1.8
A. {(-0.3, -0.2)}
B. {(-2, -3)}
C. ?
D. {(-3, -2)}
Answer: D
Mathematics
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Evaluate the indicated double integral over R.
; R = {(x, y): 0 ? x ? 1, 0 ? y ? 1}
A. 
(e5 - e3 - e2 + 1)
B. 
(e5 - e3 - e2 - 1)
C. 
(e5 - e3 - e2 + 1)
D. 
(e5 - e3 - e2 - 1)
Mathematics
Show the interval 
on a number line.
?
A. ?
B. 
C. 
D. 
E. 
Mathematics
Solve the problem.At SuperStop, gasoline costs 
per gallon when you pay with a credit card, 
per gallon less when you pay with cash. How much do you save by filling up a 14-gallon tank if you are paying cash?
A. $15.82 B. $11.20 C. $16.94 D. $1.12
Mathematics
Find the difference.- 
- 
A. - 
B. - 1
C. - 
D. 
Mathematics