To find the number of cans already on the shelf, we need to set up the correct equation based on the information given.
The shelf can hold a total of 58 cans and can still fit 39 more cans, which means the number of cans currently on the shelf can be represented as:
Let \( c \) be the number of cans already on the shelf.
Since the total capacity is 58 cans, the relationship can be expressed as:
\[ c + 39 = 58 \]
Now, we can solve for \( c \):
- Subtract 39 from both sides: \[ c = 58 - 39 \]
- Calculate the right side: \[ c = 19 \]
So, the number of cans already on the shelf is 19.
The correct equation and answer from the options provided are:
Equation: \( c + 39 = 58 \) and Answer: \( 19 \).