Necesito ayuda con el ejercicio de abajo, es de Física

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

Which of the following scenarios demonstrates an exponential decay

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?