The length of a side of a square is given by the expression 2x+1, and its perimeter is 56. write and solve an equation to determine the value of x

x =

the perimeter of the square = 4 (2x + 1) = 56 → (solve for x)

divide both sides by 4

2x + 1 = = 14

2x = 14 - 1 = 13 ⇒ x =

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