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Is the second one rational? (I'm guessing B)

 Mar 27, 2018
 #1
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The product of A is rational = -8/21

The product of B is also rational =2 x 3 =6

The product of C is irrational =sqrt(7) / 7 =0.377964473........is irrational

The product of D is rational = 7 x .07 =0.49

 

 

Both 8 and 1/8 are rational and their sum = 8+1/8 =8 1/8 = 65/8 is rational. Or B, of the 4 choices.

 Mar 27, 2018
 #2
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Yes, because 1/8 and 8 are both rational. Therefore it is B since that would add up to 65/8 or 8 1/8

 Mar 27, 2018

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