What is the perimeter of 15 3/4 24 1/4 12 2/7 12 2/7 10 1/7 10 1/7

84 6/7 or 594/7 or 84.857

Step-by-step explanation:

1. Convert the mixed numbers to improper fractions

2. Use the algebraic formula for addition of fractions:

a/b + c/d = (ad + bc) / bd

3. Reduce fractions and simplify if possible

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

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