40 mm
가
32 mm
b
What is the perimeter?

sorry not knowing about that

6-3=3

3*3=9

9+12=21

21/3=7

7*8=56

56 is your answer

answer is  

a.

7 in. x 11 in.

hope you get this right.

step-by-step explanation:

assume that y=mx+n

you may see as , where

in we change places of numerator and denominator, then we insert an opposite sign

and substitute m=-1/3 in the equation y=mx+n

point (4,2), so we substitute x=4, y=2 to the equation and calculate

the answer is