A tv costs $215 and has a 30% increase. What is the amount of increase? Show your work plz show your work

brainlist for first to answer correctly

279.5

Step-by-step explanation:

The way i found this was by doing 215 divided by 0.3 then added 215 back to it for 279.5

if x decreases by 4 then y increases by 10

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