Jonas bought 3 books. each book was the same price. he also used a coupon that takes $20 off the total cost. what expression can be used to represent the total purchase?

let x = the price of a book

 so you would have

 total = 3x-20

definition: a circle is the  set of all points in a plane that are equidistant  from a given  point  called the center of the circle. we use the symbol ⊙ to represent a circle. the a line segment from the center of the circle to  any point  on the circle is a radius of the circle.

step-by-step explanation:

i googled it and this is what i got i don't know how it is. sorry.