Please help me with these questions. I’ve literally been asking for this same answer since 7:00 pm. It’s currently 9:35 am. Plea
se just answer these questions, I’ve spent over 180 points, I was up until 5:00 am looking for answers and no one gave them to me. Please, just please, help me.
1 answer:
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Answer:
7580
Step-by-step explanation:
The formula for the sum of an arithmatic sequence is
,
where n = total number of terms (in this case 40)
= the first term (in this case 14)
and = the last term (we will need to find this)
to find the last term, we can use this formula:
where d is the difference between each term (in this case 9, because 23 - 14 = 9, and 32 - 23 = 9)
thus, = 14 + (40 - 1)9 = 14 + 39*9 = 14 + 351 = 365
plug this back into the first formula to get
Σ = (14 + 365) = 20(379) = 7580