Please help, i’ve been trying to do it, i don’t get it tho

What is the value of x? enter your answer in the box. photo attached.

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

Suppose i flip two identical coins. what is the probability that i get one head and one tail?