The perimeter of a triangle is 26 centimeters. side *a* of the triangle is 3 centimeters longer than side *b.* side *c* is 1 centimeter shorter than twice side *b.* find the length of each side. (show work)

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Which of the following parabolas opens up?

Plzzz answer both questions and i will give you 100 points