Who is good at math??

Explanation:

The x terms are 8x and -4x. They combine to 8x-4x = 4x

The z terms are 5z and 3z. They combine to 5z+3z = 8z

The 6 doesn't have anything to pair with it, so it just stays as is.

That's how we get to 4x+8z+6 as the answer.

Here's one way to think about combining like terms.

Let's say x represents a box

1x = 1 box

2x = 2 boxes

3x = 3 boxes

and so on

So saying 8x means we have 8 boxes and -4x means we take 4 boxes away

(8 boxes) take away (4 boxes) = 4 boxes left

In shorthand we'd say,

8x - 4x = 4x

Similarly, we could have

1z = 1 zebra

2z = 2 zebras

etc.

Writing 5z+3z = 8z means we started with 5 zebras, added on 3 more, to get 8 total.

10 cm

step-by-step explanation:

if the polygon is a rectangle, then the perimeter is x+x+y+y. using the values that you gave, the perimeter is 3+3+2+2=10cm.

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!