Examine the sequence of figures and find a rule/formula for the number of tiles in any figure number!

Answer:
See attachment.
Step-by-step explanation:
Observing the pattern shown in the attachment above, you'd notice that the length of each bar added to a figure is 1 box longer or taller than the previous bar.
In figure 1, the bar consist of just 1 box.
Figure 2 has 2 box. The length of the bar added to figure 1 is 1 box longer than the length of the bar of figure 1.
So, the basic rule is that, the length of the bar added to each figure is always 1 box longer than the last bar in the previous figure.
Thus,
Bar length of 3 boxes is added to figure 2 to get figure 3.
Bar length of 4 boxes is added to figure 3 to get figure 4.
For figure 5, bar length of 5 boxes would be added to give us figure 5 which is the next figure in the sequence.
The figure is shown in the attachment below.