2 Mariam collects empty cans for recycling. She collects 3 cans on day 1, 6 cans on day 2, 12 cans on day 3, how many cans will she collect on day 6 if the pattern continues?

Day 1: 3 cans
Day 2: 6 cans
Day 3: 12 cans
The number of cans collected doubles each day ($3 \times 2 = 6$, $6 \times 2 = 12$).

Mariam will collect 96 cans on Day 6.

The final answer for 4.2 is $\boxed{96 \text{ cans}}$.

From the table, when $x = m$, the corresponding $y$ value is 39.
Substitute these values into the equation:

Subtract 7 from both sides of the equation:

From the table, when $x = 51$, the corresponding $y$ value is $n$.
Substitute these values into the equation:

Add the numbers:

The final answer for 5.1 is $\boxed{m = 32, n = 58}$.