Confusedperson

Thank you hectictar for telling me that.

Just square the decimal

1)

There are 9! ways with no restrictions and If 2 pullover shirts are NOT worn two days in a row then it will be

P B P B P B P B P      

So the pullovers will have to be in the 1st 3rd 5th 7th and 9th positions these can be arranged in 5! ways. The button shirts can be arranged  4! ways

so that is5!*4! ways that two buttons up will not be together.  So the number of ways that at least 2 pullovers are worn on consecutive days is

9!  -  5!*4!

9!-5!*4! = 360000

2)

Two triangles are congruent if they have the same traced outline, possibly up to rotating and flipping. This is equivalent to having the same set of 3 side lengths.  SO the total is 9.

So 3 have no pets, so 25 - 3 = 22 students have a pet.  There are 15 cats and 16 dogs so 15 + 16 = 31.  And then 31 - 22 = 9. The 9 means that 9 students have both pets.  So the probability is 9/25.

At the rate of 20pi

My guess is 24

it does not work when I try it.

can u copy and paste it.

file:///Users/avapark/Desktop/Screen%20Shot%202018-06-01%20at%206.32.24%20PM.png

Can someone help me?????  Do u really need a diagram?  You can copy and paste the diagram

???????????????

file:///Users/avapark/Desktop/Screen%20Shot%202018-06-01%20at%206.32.24%20PM.png

here is diagram

$x^2 - 4x + 3 = -x^2 +3$

$2x^2 - 4x$

$2x(x-2)$

$x = 0, 2$