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iVinArrow [24]
2 years ago
12

Which expression is undefined?

Mathematics
2 answers:
nordsb [41]2 years ago
5 0
D. 15/9+(-9) really just means 15/9-9
Hence, 15/0
You cannot divide by 0 so you get an undefined answer
zheka24 [161]2 years ago
3 0

Answer:

D

Step-by-step explanation:

If the denominator ( bottom number ) is 0 then the expression is undefined. This is simply because a number cannot be divided by 0. However 0 can be divided by a number, the quotient would just end up being 0 though. This means that the numerator ( top number ) can be 0 and the expression will be defined

A. 0 / 3 = 0

0 is a defined answer so A cannot be the answer

B. \frac{0-8}{-4} =\frac{-8}{-4} =2

2 is a defined number so B cannot be the answer.

C \frac{7-7}{9} =\frac{0}{9} =0

0 is a defined number so C cannot be the answer

D \frac{15}{9+(-9)} =\frac{15}{0} = undefined

Because 15 is being divided by 0 and no number can truly be divided by 0 the quotient is undefined therefore D is the answer

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