Answer:

n=90

Step-by-step explanation:

an= a1+(n-1)d

a1=5 , an=450 , d=5

Substitute the value

450= 5+(n-1)5

450= 5+(5n-5)

450-5= 5n-5

445= 5n-5

445+5= 5n

450=5n

450/5=n

90=n