Question

PLEASE HELPP AND EXPLAIN!!​

Answer 1

5x + 18

Explanation:

This question is very strange, in that, you aren't finding x or how long the sides are. The "missing" side in the directions is the unmarked side.

If you add up all four sides that are labelled you find the x terms add up to 20x, but it is given that the Perimeter is 25x + 8. So the x part of the unmarked side must be 5x.

Then you'll see if you add up all the plain numbers (constants) they add up to -10. But again they told us that the perimeter is 25x + 8. So the constants need to add up to 8. We have to makeup the -10 and also 8 more for a total of 18.

The unlabelled side must be 5x + 18.

Confirm, all the sides added up, Perimeter=

(5x+18)+(4x)+(5x+2)+(5x-4)+(6x-8)

=25x+8

Answer 2

Since perimeter is the length around the shape and 4 out of 5 of the line lengths are given you can add them together by combining like terms (x with x and regular numbers with other regular numbers). 4x+5x+2+5x-4+6x-8 turns into 4x+5x+5x+6x=20x AND 2-4-8=-10. Combine those to get 20x-10 as your known perimeter. Since the perimeter is given as 25x+8, you can subtract 20x+8 from that to find the missing length. 25x+8-20x+8= 5x+15. So 5x+15 is the answer.