Asked by James
The sum of the first 5 terms of an arithmetic series is 70. The sum of the first 10 terms of this arithmetic series is 210. What is the first term of the series?
Answers
Answered by
R_scott
1st 5 terms sum ... 5 a + 10 d = 70
1st 10 terms sum ... 10 a + 45 d = 210
solve the system for a
1st 10 terms sum ... 10 a + 45 d = 210
solve the system for a
Answered by
Me
The answer is 42/5
Answered by
math person idk
R_scott - your answer was correctish, but not completed.
the answer is 42/5 because 210 was not the solution to the asked question. See if you can use what you found to create 2 equations to get the answer :D
the answer is 42/5 because 210 was not the solution to the asked question. See if you can use what you found to create 2 equations to get the answer :D
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