Answer: micheal Jackson!
Step-by-step explanation:
Answer:
Step-by-step explanation:
Find the sum of the first 42 terms of the following series, to the nearest integer.
2,7,12
Solution
The sum is given by
SUM_n=n/2*(a_1+a_n)
a_n=a_1+(n-1)d
a_1=2, n=42, d=5
The 42nd term is therefore given by
a_42=2+(42-1)5=207
SUM_42=42/2*(2+207)=21*209=4389
The sum of the first 42 terms of the series, therefore, is 4389
Simply get rid of the alphabets you don't want and you have the answer. hope this helps. be sure to give me the brainliest answer
Answer:
9.07
Step-by-step explanation:
3+5+7(2)+9(3)+11(6)+12=3+5+14+27+66+12=127
127 divided by 14 is about 9.07