Question

I wanted the answers of those questions ..whichever u can answers pls do ..

Answer 1

Answer:

70. a10=49

Step-by-step explanation:

an = a+(n-1)d

a10 = 4+9(5)

a10= 49

Answer 2

58.) 3n²+4n(Given)

Put the value of n=1

3(1) ²+4(1) =3(1) +4(1)

=3+4=7

Put the value of n=2

3(2) ²+4(2) =3(4) +4(2)

=12+8=20

Put the value of n =3

3(3) ²+4(3) =3(9) +4(3)

=27+12=39

a=7, d=a2-a1

=20-7=13

Now, it is an A.P. 7,20,39,....

Now, find the 25th term of an A. P.

a+24d

= 7+24(13)

=7+312

=319 Ans.

I hope this will help you!!!