If a1 = 5 ; an = 450 and d 5, find the value of n ?
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If a1 = 5 ; an = 450 and d 5, find the value of n ?
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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