Answer:
an=7/2
Explanation:
an=a(n-1)+15
given a1=8
multiply; a(n-1)
a(n-1)=an-a1
enter an-a1 in the equation
an=an-8+15
an=an+7
collect like terms;
an-an=(-7)
divide by negative both side
an-an/(-)=(-(-7)
2an=7
divide by 2 both side
2an/2=7/2
therefore the answer is an=7/2