Chứng minh các hàm số sau là liên tục tại mọi điểm x R  a. f x x ( ) 6 3  
b. f x( ) = mx +b
c. Hãy nêu ý nghĩa của hàm liên tục trong kinh tế? Trình bày một vài ví dụ minh
họa?

Adriver from the university of florida women’s swimming and diving team is competing in the in ncaa zone b championships

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?