23/5 + 1 4/5 = what is the answer in simplest from?

22/5 (improper) or 4 2/5 (mixed)

Step-by-step explanation:2 3/5 can be rewritten as 13/5 by multiplying 2 by 5 and adding it by 3. The same can be done with 1 4/5. 1 *5 = 5 5+4 = 9. 9/5 +13/5 = 22/5

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

you already gave the answer

step-by-step explanation: