If x2 – y2 = 58 and x-y=4 what is the average of x and y?
Correct answer B. 27
Tip: press A, B, C or D to answer, and N for the next question.
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See allWhat is the value of a2-b2/a-b when a = 12.3 and b = 13.2?
Correct answer B. 25.5
Which of the following is equal to (z+1/z)2-(z-1/z)2?
Correct answer B. 4
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If a2+b2 = 8 and (a-b)2 = 4 what is the value of ab?
Correct answer C. 2
If a2-b2 = 21 and a2+b2=29 which of the following could be the value of ab? I- -10 II- 5?2 III- 10
Correct answer D. I and III only
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