What is approximate circumference of circle with diameter of 42 in lowest terms​

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

Me find the value of x each figure.

Y=21.95x+10 y=22.45x solve by substitution