To simplify the expression \( c+c+c+c+c+y+y+y+d+d+d+d \), we combine like terms.
- For \( c \): There are 5 of them, so we have \( 5c \).
- For \( y \): There are 3 of them, so we have \( 3y \).
- For \( d \): There are 4 of them, so we have \( 4d \).
Putting these together, we get:
\[ 5c + 3y + 4d \]
Thus, the simplified form is \( 5c + 3y + 4d \).
The answer is:
a. 5c + 3y + 4d