To solve this you have to find the area of the rectangle and triangle separate and then you add them to find the whole area of the composite figure.
Rectangle- height is 7 & length is 13 because the triangle’s height is 7 so you subtract 7 from 20. So 7 times 13= 91
Triangle- height is 7 & length is 7
7 times 7 is 49
Then add them which gives you the area of 140
Hope that was a good explanation:))