Answer:
The perimeter is 16 units
Step-by-step explanation:
Add up all the sides together
1+1+7+7 = 16
The statement Perpendicular line intercept at 90 degree angle is true.
Answer:
The slope is 
Step-by-step explanation:
∵ The rule of the slope passing through 2 points is:
m = 
∵ The points are (7 , 8) and (-7 , 1)
∴ m = 
Anything to the zeroth power is 1, so the answer is just 1.
First one is 42
second is 24
Third is 12