A box is filled with 10 yellow cards, 3 green cards, and 2 brown cards. A card is chosen at random from the box. What is the probability that it is a yellow or a
brown card?
Write your answer as a fraction in simplest form.

4/5

Step-by-step explanation:

The total number of cards is 15. Pretend that the yellow and brown cards are one big group of blue cards. Now, the problem is asking for the number of blue cards over the total number of cards, which is (10+2)/15 = 12/15 = 4/5.

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

12cm

the answer is d