A theater sells t tickets at p dollars each the theater conducts a survey and predicts the price of each ticket is changed by $2 the number of tickets sold will change by 15 tickets if n is the number of times the theater changes the ticket price by $2 the expression (p+2n)(t-15n) can represent the total theater revenue in dollars in this equation what dose (t-15n) represent

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for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)