Answer:
1/4 and 3/5
Step-by-step explanation:
4. 7/28 5. 12/20
1/4 6/10
3/5
The angle sum of triangle is 180 degrees, so 180-125 = 55
The fromula of a slope:

a) (-1, -8), (-7, -4)
substitute

b) (2.1, 3.8), (3.1, 7.6)
substitute

It is about 3,000. There is no #4 on your picture, so I just answered number one because that is all I saw.
Answer:
To use the coordinate plane to help you find the perimeter and area of various shapes, you first draw the shape on the coordinate plane and then you count the number of unit squares the shape takes up. For the perimeter, it's the number of unit squares that go around the shape.