Evaluate the arithmetic series described:
a1=5, an = 145, Find S15

well, a = 5 and an = 29

Thats the furthest i got- sorry i to lazy to do work rn but atleast i found out what a and an equals to- i think

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b