El doble de un numero del cuadrado de un número es igual al cuadrado del sucesor (el q sigue del numero 14 ) ¿cual es ese numero?

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.