Verify the property a x (b+c) =(a x b)+(a x c) by taking: a = -7, b = (2/5), c = (-3/7)
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Let x be the amount each friend pays .
There are five friends contributing ,so 5x will be the total money collected .
It needs to equal the price plus the tax, 210 + 15 = 225
So the equation becomes,
5x = 225
dividing right side by 5, we have
x = 225/5 = 45
Answer: So each frien pays $45.