#1).
Surely, now that you're in middle school, you know that the volume of a cube is
(the length of the edge)-cubed
OR
(length of the edge) x (length of the edge) x (length of the edge) .
The length of the edge of the cube in the picture is 9-ft.
To find the volume of the cube, use the formula that I just reminded you of.
#2).
Twenty minus nine is written as (20 - 9).
Seven is written as (7) .
Their product is written as (20 - 9) x (7) .
To find the value of the expression:
Do the subtraction inside the parentheses: (20 - 9) = 11
So now the whole expression is
(11) x (7)
Now do the multiplication:
11 x 7 = 77
