a1+a2+a3+a4=2(a1+a3)+2d
45=2*15+2d
2d=15
d=15/2
a1+a3=2a1+2d
15=2a1+15
a1=0
an=a1+(n-1)d
=0+(n-1)15/2
=15(n-1)/2
=7.5n-0.5