Suppose that 25 days are chosen at random from a calendar. explain why at least 3 of the 25 days must lie in the same month. do some research to find the name of the principle you've used, and clearly describe it in your own words.

Step-by-step explanation:

If you have to choose 25 days, you have to think how many months there are.

The year has 12 months, so, if you divide 25 days /12 months =2,08333. (more than 2--> 3)

So if you happen to choose 2 of every month you have 24 days chosen, you have to pick one extra day and will add 3 to the month it belongs.

In any way you choose, you an be sure there is at least one month with 3 or more days chosen.

step-by-step explanation:

hjkj

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