Solve the system by the addition method.4y = 4 - 6x2x = 28 - 4y
A. {(-6, 10)}
B. {(6, -10)}
C. {(4, -10)}
D. ?
Answer: A
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Solve the initial value problem, if possible.
yy'(t) = t3, y(0) = 2
A. y = 
B. y = 
C. y = 4
D. y = 
Write an algebraic expression for each quantity using the given variable.The second angle of a triangle is triple the first. The third angle of the triangle is 
smaller than the first. Use the letter x.
A. x = first angle; 3x = second angle; 40 - x = third angle B. x = first angle; 3x = second angle; x + 40 = third angle C. x = first angle; x - 40 = second angle; 3x = third angle D. x = first angle; 3x = second angle; x - 40 = third angle
Solve the variation problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 22 minutes requires 15.4 gallons of water. Find the amount of water used in a shower lasting 4 minutes.
A. 3.5 gallons B. 2.1 gallons C. 2.8 gallons D. 88 gallons
Write as a percent. Round the percent to the nearest tenth if necessary.
A. 33.1% B. 3.6% C. 110% D. 36.4%