Question

13. Find the sum of the first 15 multiples of 8.​

Answer 1

Step-by-step explanation:

you can solve it as follows:

Answer 2

Answer:

97

Step-by-step explanation:

tn=a+(n-1)d.

Here, tn =15

d=8

=15=a+(15-1)8

=a+14×8

=a+112

=112-15

=97.

I think it's helpful for you.