Question in image below.

You know that XZ is 15 and the whole perimeter of the triangle is 50. WZ is going to be the same length as WX due to the lines saying that they are equal.

Your first step is to take 50-15=35, we did this because we already know the length of one side and can take that off from the whole.

The next step is to divide 35 by 2, because both sides are going to be the same length.

35/2=17.5

You final answer would be 17.5

Hope this helps ;)

The length of WZ is 17.5 (which agrees with the third answer in the list)

Step-by-step explanation:

Notice that we are in the presence of an isosceles triangle where two sides are exactly equal (sides WZ and WX).

The perimeter (additions of all sides) of the triangle is 50, and the size of side XZ is given as 15.

Then if we subtract 15 from 50, we get the addition of the two equal sides: 50 - 15 =  35.

So, now divide this by 2 to get the length of just one of the unknown sides:

35 / 2 = 17.5

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step-by-step explanation: