Answer:
F(x)=4X X=5
F(5)=4X
4(5)
20
Y=4(20)
Y=80
Step-by-step explanation:
common difference d=3-1=2
first term a=1
an=a+(n-1)d
2n-1=1+(l-1)2
2n-1=1+2l-2
2n-1=2l-1
l=n
(i used l for number of terms)
number of terms=n
0.01470588235