Question

Find the sum of the arithmetic sequence.

5, 7, 9, 11, ..., 23

59

40

25

140

Answer 1

7-5=2; 9-7=2;11-9=2 so 11+2=x; x+2=y; y+2=z and so on. :)

Answer 2

5,7,9,11,13,15,17,19,21,23 check you answers :)
what is 59,40,25 and 140 for?

Answer 3

i dont get it????

Answer 4

i think its 140

Answer 5

5+23 = 28
7+21 = 28
9 + 19 = 28
...
13+15 = 28

The equation will be your first term plus your last term multiplied by the amount of terms and divided by two

Answer 6

3 + (2)(1) + 3 + (2)(2) + . . . + 3 + (2)(10)

(3)(10) + 2(1 + 2 + 3 + . . . + 10)

30 + (2)(55)

140

Answer 7

thx for the medal!