Question

If x is the midpoint of -21 and 18, find the value of x.
midpoint =

Answer 1

−1½ = x

Explanation:

First, find the range in between 18 and −21, which is 39:

`18 - x = -21 \\ \\ 39 = x`

Take half of that range, then add that to −21:

`19(1)/(2) = (39)/(2) \\ \\ -21 + 19 (1)/(2) = -1(1)/(2)`

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Answer 2

The distance from -21 to 18 would be 39 units ( -21 to 0 is 21 and from 0 to 18 is 18 , 21 +18 = 39)

To find the midpoint distance, divide the total distance by 2:

x = 39/2

x = 19.5

Now to find the midpoint, either add 19.5 to -21 or subtract 19.5 from 18.

Midpoint = -1.5