Question

find the sum of the first 15 multiples of 8

Answer 1

Step-by-step explanation:

Let S be the sum

S = 8(1)+8(2)+8(3)+.........+8(15)

S = 8(1+2+3+4+.....+15)

$s = 8( \frac{15(15 + 1)}{2} ) \\ s = 8(15 \times 8)$

S = 960

Hope you understand, if you've any doubts comment below ;))

Answer 2

Answer:

your answer is in the pic