Which number produces an irrational number when multiplied by -1.25? (WORTH 12 POINTS!!)

A rational times an irrational is irrational.

Step-by-step explanation:

Let  x  be an irrational number and

be a rational number

We want to show that is irrational through contradiction:

Assume is rational. Rearranging, we get ;

which is a contradiction.

Therefore, a rational times an irrational is irrational.

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step-by-step explanation:

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687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09