Please solve this with explaining so I can write it! ASAP

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Find the area of the regular hexagon if a side is 20 cm.

Ineed on this question me get the answer