Answer:

Step-by-step explanation:
The formula of a slope:

We have two points:

Substitute:

Answer:
25
Step-by-step explanation:
Get the perimeter of the each shape and add it all up to get the total fencing material required.
2 square flower beds = 2 x 4a = 8a
1 rectangular play ground = 2l + 2w
total fencing material = 8a + 2l + 2w
No, it can NEVER be 21.
It will always be 19.
Even with the commutative and associative property of addition.