Solve the system of equations. x + y + z = 5 x - y + 3z = -15x + y + z = 21
A. x = -1, y = 2, z = 4
B. x = 4, y = 2, z = -1
C. x = -1, y = 4, z = 2
D. Inconsistent
Answer: B
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Simplify.
A. 
B. 
C. 
D. 
Solve the problem.A gas company has the following rate schedule for natural gas usage in single-family residences:Monthly service charge $8.80Per therm service charge1st 25 therms$0.6686/thermOver 25 therms$0.85870/thermWhat is the charge for using 25 therms in one month?What is the charge for using 45 therms in one month?Construct a function that gives the monthly charge C for x therms of gas.
What will be an ideal response?
Use the sum/difference identities to simplify the expression. Do not use a calculator.cos 
cos 
+ sin 
sin 
A. cos 
B. cos 
C. cos 
D. cos 
Provide an appropriate response.For the exponential expression pn = 1, the variable p may equal ? .
What will be an ideal response?