A plumber charges a $70 call-out fee and then $90 per hour. Write an expression for the total cost of calling a plumber for x hours.

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

i hope this is what you were looking for.

see attached graph

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)