Solve the system of equations by the substitution method.y = 
x - 7y = 
x + 11
A. 
B. {(-36, -13)}
C. {(-36, 13)}
D. {(42, 0)}
Answer: B
Mathematics
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Use De Moivre's theorem to evaluate the expression. Write the result in standard form.i14
A. -1 B. -1 + i C. i D. 1 - i
Mathematics
Translate the problem to a system of equations, then solve using Cramer's Rule.Two different gasohol mixtures are available. One contains 5% alcohol and the other 12% alcohol. How much of each should be mixed to obtain 500 gallons of gasohol containing 10% alcohol?
A. 208 gal 5%, 292 gal 12% B. 143 gal 5%, 357 gal 12% C. 357 gal 5%, 357 gal 12% D. 25 gal 5%, 60 gal 12%
Mathematics
Solve the equation for the specified variable.F = 
C + 32 for C
A. C = 
B. C = 
(F - 32)
C. C = 
D. C = 
(F - 32)
Mathematics
Solve.c - 
= 0
A. - 
B. 2
C. 
D. - 2
Mathematics