Question

What number should go into the blank so that the two expressions are equivalent to each other? (Use only the digits 0 - 9 to write the number.)

b + b – 1 + b + b + 10 = __b + 9

Answer 1

4.

Explanation:

lets just say the unknown is x.

`b+b-1+b+b+10=bx+9\\4b+9=bx+9\\4b=bx\\4=x\\`

Hope this helps :D