Question

How do i solve this? tysm!!

Answer 1

Explanation:

k = 10

14 - `1/2 * 10

14 - 5 = 9

k = 11

14 - 1/2 * 11

14 - 5.5 = 8.5

k = 12

14 - 1/2*12

14 - 6

8 8

K = 13

14 - 1/2 * 13

14 - 6.5 7.5

K = 14

14 - 1/2* 14

14 - 7 = 7

Sum = 9 + 8.5 + 8 + 7.5 + 7 =

Sum = 40

If you know the sum formula, you could use it.

n = 5

a = 9

L = 7

d = -1/2

Sum = (a + L)*n/2

Sum = (9 + 7)*5/2

Sum = 16 * 5 / 2

Sum = 40