Let $C(t)$ represent the number of croissants sold at a small cafe on a given day, $t$. Use shifts of the function $C(t)$ to find a formula for each of the following functions in terms of $C(t)$. Be sure to use capital letters where appropriate.

a) $M(t)$, the number of muffins sold at the cafe on day $t$, is remarkably always 5 more than the number of croissants sold on day $t$.
$M(t)=$

b) $B(t)$, the number of croissants the bakers plan to make on day $t$, is equal to the number of croissants sold on the same day of the week the week before.
$B(t)=$

Hint: