If you use the midpoint formula which is [(X1+X2)/2,(Y1+Y2)/2], you will get your midpoint is [(a+b)/2,(b+c)/2]
If you are asking what x equals, it equals 2/5, but if it is something else more information is needed
They left $6.72 for a tip.
42 x 0.16 = 6.72
The correct answer is: [C]: <span>4(a + b + 2) .
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