Problem 3. A square has side lengths of (-3a + 4c - 2.1b) inches. Write a simplified expression to represent the perimeter, in inches of the square.

answer: 1, 3 and 5 are correct

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

c-   36

taxicab circle radius 9 has 4(9) = 36 points

i need more details

step-by-step explanation: