Solve the problem.When 4 times a number is subtracted from 7 times the number, the result is 21. What is the number?
A. 3
B. 0.6
C. 7
D. -7
Answer: C
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Use the substitution method to solve the system.-3x + y = 3-6x - 3y = 1
A. 
B. 
C. 
D. 
Answer the question.Which number is larger?
A. 0.076
B. 
Rewrite the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the trigonometric expression without the use of a calculator.cos2 60° - sin2 60°
A. - 
B. - 
C. 
D. 
Solve the problem.A private shipping company will accept a box for domestic shipment only if the sum of its length and girth (distance around) does not exceed 108 in. Suppose you want to mail a box with square sides so that its dimensions are 
and it's girth is 
What dimensions will give the box its largest volume?
A. 24 in. x 24 in. x 18 in. B. 18 in. x 18 in. x 90 in. C. 36 in. x 18 in. x 36 in. D. 18 in. x 18 in. x 36 in.