The 28 term of an ap is -5, find the common difference if its 1st term is 31

Answer 1

27 differences (1st to 28th)

common difference = (-5 - 31) / 27

Answer 2

or, using your definitions:

term(28) = a + 27d = -5 , but a = 31
31 + 27d = -5
27d = -36
d = -36/27 = - 4/3

Answer 3

28t=a+27d
since 28t=-5 ,a=31
-5=31+27d
-27d=31+5
-27d=36
d=-36/27
d=-4/3

Answer 4

Thank you very much

Answer 5

thanks

Answer 6

T28=6+(28-1)d
6+(27)5
6+135
141

Answer 7

T28=a+(n-4)d
-5=31+(28-1)d
-5=31+27d
Collect like terms
27d=-5-31
27d=-36
D =-36/27
D=-4/3