Orla says that x = 5 is a solution of x² + 3x - 10 = 0 and Fiona says that x = -5 is a solution of x² + 3x -10=0.

One of the answers is correct. Say which answer is correct and justify your answer

Cindi bought a sheet pizza for a party. some of the pizza has pepperoni, some has onions, and the rest of it has both. two-fifths of the pizza has just pepperoni and one-third of the pizza has just onions. what fraction of the pizza has both pepperoni and onions? answer asap