**Answer:**

The answer is 132

**Step-by-step explanation:**

One method to see it's a trapezoid is to find the slope of lines BC and AD.

The slope formula is

m = (y2-y1)/(x2-x1)

You should find that BC and AD both have the same slope (of -1), so that means the lines are parallel. That proves we have a trapezoid.

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To prove this trapezoid is isosceles, you can use the distance formula

to find the lengths of AB and CD (the two non-parallel sides). You should find that AB = CD.

Because AB and CD are horizontal and vertical respectively, this means you can simply count out the spaces to find that AB and CD are 3 units each. For any other rotated version of this trapezoid, use the distance formula instead.

**Answer:**

2 and a half

**Step-by-step explanation:**

**Answer:**

n + 10

**Step-by-step explanation:**

im pretty sure thats right, im sorry if not but have a great day!