If the 7th of an ap is equal to 11 times the 11th term, find the 18th term

Five dinosaurs go for a walk and come across some lovely chicken wings. their names are rexy, bronto, steggy, paly, and terry. there are exactly 5 dozen wings(equal enough for each dino to have a dozen right? ); however, terry is on a diet and he only eats 6 wings. if paly eats 2 more than terry, steggy eats 4 more than paly, and bronto and rexy eat the same amount because they are really hungry from not eating all day, how many chicken wings did each dino eat?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.