Find the sum of the first 21 terms of the arithmetic sequence 5, -2, -9.

-1365

Step-by-step explanation:

The difference is -7, so you apply that to each number to get your answer.

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step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35

answer: 4 meters

step-by-step explanation: to you understand 2/3 better you can do 1 divided by 3 = . then multiply that by the 2 which is .66666666666666667 then you would do 6 x .66666666666666667 which is 4.      

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