They didn’t use a ruler I think they made their own materials from what they had. Also thank you.
-2(2b-3)
Multiply the bracket by -2
Whenever multiplying a -negative number with a -negative number= + positive number.
(-2)(2b)(-2)(-3)
-4b+6
Answer: -4b+6
22 unit cubes and 2 smaller cubes of volume cubic inch each
