Question 1197635: 1st question:
If the sum of the first two terms of an arithmetic sequence equals the sum of the first three terms,find the sum of the first five terms.
2nd question:
the terms a,m,n,b form an arithmetic sequence.Express m and n in terms of a and b.(The terms m and n are arithmetic means of the terms a and b.)
Method I 've tried: d=(b-a)/3
3rd question:
Is y,x+2y,2x+3y....an arithmetic sequence?If it is,find the sum of the first 100 terma.
Method I 've tried:yes,because d=a2-a1=x+2y-y=x+y a3-a2=(2x+3y)-(x+2y)=x+y ,
but i do not know how to count the sum.
4th question:
A bank loan of $8000 is repaid in annual payments of $1000plus 10% interest on the unpaid balance.What is the total amount of interest paid?
5th question:
In preparing a bid for constructing a new building,a contractor determines that the foundation and basement will cost $605000 and the first floor will cost $360000.Each floor above the first will cost $15000 more than the one below it.How much will the building cost if it is to be 18 floors high?
Thank you.
Answer by greenestamps(13200)   (Show Source):
You can put this solution on YOUR website!
ONE question per post.
Your first three questions are on the same subject, so you could post them together; however, they really should be posted separately.
The other two questions are on completely different topics and MUST be posted separately.
Re-post the questions one at a time, as the posting instructions say....
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