The price of 6 slices of pizza and
4 drinks is $37. The price of 4 slices
of pizza and 6 drinks is $33. How
much does one drink cost?

$5.26 each

Explanation:

Each pizza slice is $2.66

1.) *Multply 2.66 by 6*  2.66 x 6 = 15.96

2.)* subtract 37 from 15.96* 37 - 15.96 = 21.04

3.)*Divide 21.04 by 4* 21.04 / 4 = 5.26

So,each drink is $5.26.  

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answer: a.   one is a factor of every whole number since every number is divisible by itself.