Mathematics: Justin’s doctor said that the expression x+y+5/2, where x and y are his parents’ current heights in inches, gives an estimate of how tall justin will be as an adult. justin’s work evaluating the formula is shown below. mom’s height = 54 inches dad’s height = 71 inches 71+54+5/2 = 71+27+5=130 inches what error did justin make? he should have made x equal 54 and y equal 71. he should have added the values in the numerator before dividing by 2. he should have divided the 71 by 2 instead of the 27.

Justin’s doctor said that the expression x+y+5/2,

Ответ:

hinacat87

03.06.2020

Sorry to say, but I think they are all wrong. Without brackets technically only the 5 is divided by 2. I think it means (71 + 54 + 5 ) /2 (Mom is a little on the short side. 4 feet 6 inches to be exact. )

So I guess the correct answer is add the numerators and divide by 2
71 + 54 + 5 = 130
Now divide by 2
130 / 2 = 65.

I'm not at all sure this is correct. Brackets make life a whole bunch easier.