50 POINTS WILL GIVE BRAINLIEST TO FIRST CORRECT ANSWER! The image is the figures and there pattern. they add 1 tile height and one tile length on the top horizontal line every figure. I don't need an explenation but I would prefer to have one so I can do these kinds of questions on my own.

a) write the pattern rule as an equation.
b) determine the number of tiles that will be in figure 100.