Simplify the expression by combining like terms if possible.7x2 - 5 + 5x2 + 4
A. 11
B. 11x2
C. 12x2 - 1
D. 2x2 - 1
Answer: C
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Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Incorrect; should be 116 B. Correct C. Incorrect; should be 115 R208 D. Incorrect; should be 115 R318
Solve the problem.The amount of gas that a helicopter uses is directly proportional to the number of hours spent flying. The helicopter flies for 3 hours and uses 30 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 6 hours.
A. 60 gallons B. 66 gallons C. 70 gallons D. 18 gallons
In the figure, the distance from A to D is y, the distance from D to C is x, and the distance from C to B is h.
?
?
If 
, 
, and 
, find h, then x.
?
Round each answer to the nearest whole number.
?
A. ?
B. ?
C. ?
D. ?
E. 
Solve the compound inequality. Other than ?, use interval notation to express the solution set and graph the solution set on a number line.8 < 2x ? 10
A. (-?, 4) ? [5, ?)
B. (-?, 4] ? (5, ?)
C. [4, 5)
D. (4, 5]