
Square 12.1, and subtract 121 from both sides.

Complete the subtraction on the right side.

This is the solution.
She will need 8 more barbies, to reach a total of 12.
Hope this helps!
You use variables for the equation and after you find out the variables you set them equal to each other and see if they are equal
According to the FIFO method, the earliest sweaters are the ones that are sold off first, so if we have 24 remaining, 15 were bought in September (at $45 each) and the last 9 were from June (at $38 each). Then we calculate the total value by:
15($45) + 9($38) = $1,017
The value of the inventory is $1,017.