Question

hlo mate can uh help ?
plz solve with step by step

don't spam ❎

_____100 points ​

Answer 1

hello mate ⚘

An = a + d (n -1 )

Sn = n * [ a  +  a + d (n-1) ]  / 2  =  n * mean of 1st term and nth term

90 =  n * [ 4 + 8 n - 8 ] /2 =>  180 = 8 n² - 4 n    =>  2 n² - n - 45 = 0

n = 5    => An = 2 + 4 * 8 = 34

Answer 2

Answer:

The solution is in attachment...