Write two expressions that are equivalent to the expression below.

Question

$\left(9\ -\ c\right)\ +\ \left(9\ -\ c\right)\ +\ \left(9\ -\ c\right)\ +\ \left(9\ -\ c\right)$

Answer 1

$4\left(9\ -\ c\right)$

$4\cdot9\ -\ 4c$