I f space m angle 3 equals m angle 5 space space t h e n space m angle 5 equals m 3

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17

25/6

step-by-step explanation:

you multiply 4 by the denominator (4*6=24) and add it to the numerator which makes it 25/6.

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.