Answer:
Step-by-step explanation:
We have been given that Niu has decorated x cards. He started with 24 stickers and he used 4 stickers per card. So stickers used in x cards will be 4x.
As initial number of stickers was 24, so we can find number of stickers left after decorating x cards by subtracting number of stickers used in x cards from 24.

Therefore, the expression
will represent the number of stickers that Niu has left after decorating x cards.
Please provide more information. You need to add the sides of the polygon to find the perimeter.
Do you mean 7 more than the product of 5 and a number? If so the answer is... y=7+5x
The slope is 16/4 which is 4/1 which can also be 4. So the most simplified is 4