# Seats

Seats in the sport hall are organized so that each subsequent row has five more seats. First has 10 seats. How many seats are:

a) in the eighth row
b) in the eighteenth row

Result

a =  45
b =  95

#### Solution:

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

## Next similar examples:

1. Sequence
Between numbers 1 and 53 insert n members of the arithmetic sequence that its sum is 702.
2. Roots
Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
3. Roof
Tiles are stacked in rows on the trapezoidal shaped roof. At the ridge is 15 tiles and each subsequent row has one more tile than in the previous row. How many tiled is covered roof if lowermost row has 37 tiles?
4. Sequence 3
Write the first 5 members of an arithmetic sequence: a4=-35, a11=-105.
5. Sequence 2
Write the first 5 members of an arithmetic sequence a11=-14, d=-1
6. AS - sequence
What are the first ten members of the sequence if a11=22, d=2.
7. Sequence
Write the first 7 members of an arithmetic sequence: a1=-3, d=6.
8. Sequence
Write the first 6 members of these sequence: a1 = 5 a2 = 7 an+2 = an+1 +2 an
9. AP - simple
Determine the first nine elements of sequence if a10 = -1 and d = 4
10. AP - basics
Determine first member and differentiate of the the following sequence: a3-a5=24 a4-2a5=61
11. Theorem prove
We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
12. AS sequence
In an arithmetic sequence is given the difference d = -3 and a71 = 455. a) Determine the value of a62 b) Determine the sum of 71 members.
13. Third member
Determine the third member of the AP if a4=93, d=7.5.
14. Calculation
How much is sum of square root of six and the square root of 225?
15. Trinity
How many different triads can be selected from the group 43 students?
16. 75th percentile (quartille Q3)
Find 75th percentile for 30,42,42,46,46,46,50,50,54
17. Fish tank
A fish tank at a pet store has 8 zebra fish. In how many different ways can George choose 2 zebra fish to buy?