The sum of the first ten terms of a linear sequence is -60 and the sum of the first fifteen terms of the sequence is -165.Find the 18th term of the sequence.

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.

1) the property is   ixi = a ⇔x = a   o x = -a

4(x-5)+3= 15⇒4x-20+3 = 15⇒4x-17= 15⇒4x = 15+17⇒4x = 32⇒x =32/4= 8

4(x-5) +3= -15⇒4x-20 +3 = -15⇒4x-17= -15⇒4x =-15+17⇒4x = 2⇒x =2/4= 1/2

the values are x =8 and x = 0,5

correct answer was 0.5