The next number is 31
There is a pattern
3+1=4
4+2=6
6+3=9
9+4=13
13+5=18
18+6=24
24+7=31
You just add the total you got by the next number up.
Hope this helps
To find how munch wrapping paper you will need to cover the box you will have to find the area. The formula for area is length multiplied by the width. The length in this equation is 10 inches and the width is 8 inches and 8 multiplied by 10 is 80 so you will need 80 INCHES OF wrapping PAPER to cover the box.
Firstly, subtract a^2 on both sides:
Next, we are going to be using the difference of squares, which is . Use this on the right side of the equation:
Lastly, square root both sides of the equation, and <u>your answer will be </u>