What is the value of x in the following equation?
2 (x - 4) + 15 = 21

What are “like terms”? why can we only add like terms?

X-intercept=-5 y-intercept=2 the equation of the line is

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online