题目内容
（请给出正确答案）
For real numbers a and b, when is the equation ∣a+b∣=∣a–b∣true？
A.Always
B.Only when a=b
C.Only when a=0 and b=0
D.Only when a=0 or b=0
E.Never
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第1题
e. The charge forthe use of the plane varies directly with the square root of the time the plane is used. If a lesson plus 16 minutes of plane usage costs $90, what is the total amount charged for a lesson having 36 minutes of plane usage?
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B.$150
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第2题
What is the area of the stained-glass panel, to the nearest 0.1 square foot?
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第3题
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B.-4a - 4b + 8c
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第4题
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C.-11/9
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E.70/9
第5题
ach hour over 40 hours of work in a week, Joelle is paid 1 times her regular pay. How much does Joelle earn for a week in which she works 42 hours?
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第6题
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A.28
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第7题
What is the least common denominator for adding the fractions 4/15,1/12, and 3/8?
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第8题
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第9题
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A.1/2
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第10题
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B.9
C.10
D.11
E.12
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