The answer would be Associative Property.
Hope this helps you =)
Answer:
70
Step-by-step explanation: the type of angle it is
Answer: The slope of the line is 
Step-by-step explanation:
The slope of a line can be calculated with the following formula:

Then, given the points
and
, you can identify that:

Knowing these values you can substitute them into the formula for calculate the slope:

Finally, evaluating, you get that the slope of that line is:

Answer: Right triangle
Step-by-step explanation: There is a 90 degree angle diagonal from the hypotenuse