Arectangle has a links of 5" and a with of x inches write a equation to represent the perimeter of the rectangle explain your reasoning

10+2x

Step-by-step explanation:

A rectangle has 4 sides. Two pairs of sides are congruent.

For example a rectangle could have sides of 6, 10, 6, and 10.

So the perimeter would be the sum of those sides, 6+6+10+10.

6+6+10+10 can be written like 2(6)+2(10)

For the rectangle in your question it would be 5+5+x+x, which can be written like 2(5)+2(x)

Simplify to 10+2x.

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