Question

i in an ap is the common difference
d = -4 and seventh term is a7 is 4 then find the first term

Answer 1

A7 = a+6d
A+ 6 * -4
The answer is -24

Answer 2

Hey

Here is your answer,

D=-4
A7=4

An=a+(n-1)d
A 7=a+(7-1)(-4)
4=a+6(-4)
4=a-24
a=4+24
A=28.

Hope it helps you!