Solving a value mixture problem using a system of linear equations

suppose that there are two types of tickets to a show: advance and same - day. the combined cost of one advance ticket and one same-day ticket is $40. for one performance, 20 advance tickets and 40 same-day tickets were sold. the total amount paid for the tickets was $1300. what was the price of each kind of ticket ?

advanced ticket: ?
same-day ticket: ?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?