Solve the system by substitution.x - 5y = -4x + 8y = -4
A. {(-4, 0)}
B. {(0, -4)}
C. {(0, 4)}
D. {(4, 0)}
Answer: A
Mathematics
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Solve the problem.Evaluate 
at (u, v) = (5, 3) for the function w(x, y) = xy2 - ln x; x = eu+v, y = uv.
A. 675e8 - 1 B. -1 C. 375e8 - 1 D. 300e8 - 1
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Solve the problem.An object of mass m is dropped from a helicopter. Assuming that air resistance is proportional to velocity, the velocity v of the object satisfies the equation 
Find velocity as a function of time.
A. v = 
(1 - e-kt/m)
B. v = 
- e-kt/m
C. v = 
(1 - ekt/m)
D. v = 
(1 - e-kt/m)
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Write as a proportion.6 is to 8 as 12 is to 16.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
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Solve for the missing number.
= 
A. 1.9 B. 144.06 C. 0.10 D. 4.9
Mathematics