If a rectangle is 10 units wide and x units long what is the perimeter of this rectangle?

20+2x

Step-by-step explanation:

Uh I have no way to explain it the answer is just 20+2x ;w; (I think)

20+2x

Step-by-step explanation:

10+10=20

x+x=2x

20+2x

i use my brain for prombles like this maybe you could try it

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional