You have to distribute the minus sign to the second parenthesis, changing the sign of every term:

Step-by-step explanation:
Volume of cylinder
= πr²h
= π×3²×6
= 54π
= 169.56units³
Answer:
y + 1 + y + 2 + y + 3 =3y+6
Step-by-step explanation:
study hard:)