1. One side of a rectangle is 3m more than the other. If the perimeter of the rectangle is 30 m, what are its dimensions? L= 4m and W= 7m C. L= 6m and W= 9m L= 5m and W= 8m D. L= 7m and W= 10m

6m by 9 m

Step-by-step explanation:

x = one side of the rectangle

x+3 = other side

The perimeter of a rectangle is

P = 2(l+w)

P =2( x+ x+3)

P = 2(2x+3)

30 = 4x+6

30 -6 = 4x

24 = 4x

Divide by 4

24/4 = 4x/4

6 =x

One side is 6 and the other is 6+3 or 9

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