Question

Wrin an a.p first term is -24 and 31st term is -34 .find the 70 th term

Answer 1

Answer:-47

Step-by-step explanation:

a(first term)=-24

a31= -34

First we find the common difference:

a31= a+30d

-34=-24+30d

30d=-34+24

30d=-10

d=-1/3

to  find the 70th term:

a70=a+69d

=> -24+ (69*-1/3)

=> -24-23

=> -47

The 70th term is -47.

Answer 2

Step-by-step explanation:

a1= -24

a31= -34

by using formula an= a+(n-1)d

a31= -24+(31-1)d

-34= -24+30d

30d= -34+24

30d= -10

d= -10/30

d= -1/3

a= -24 and d= -1/3

then a70 = -24+(70-1)(-1/3)

a70= -24+(69)(-1/3)

a70= -24 -23

a70= -47. answer