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kramer
3 years ago
7

 Find the perimeter. Simplify the answer

Mathematics
2 answers:
elena-14-01-66 [18.8K]3 years ago
6 0
Add the sides and then combine like terms and solve it the answer should be 30s-18
stira [4]3 years ago
5 0

3s - 1 + 7s - 1 + 10s - 8 + 10s - 8 \\ 10s - 2 + 20s - 16 \\  = 30s - 18

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There are 22 rows of seats on a concert hall: 23 seats are in the 1st row, 27 seats on the 2nd row, 31 seats on the 3rd row, and
JulijaS [17]
We can model this situation with an arithmetic series.
we have to find the number of all the seats, so we need to sum up the number of seats in all of the 22 rows.

1st row: 23
2nd row: 27
3rd row: 31
Notice how we are adding 4 each time.

So we have an arithmetic series with a first term of 23 and a common difference of 4.

We need to find the total number of seats. To do this, we use the formula for the sum of an arithmetic series (first n terms):

Sₙ = (n/2)(t₁ + tₙ)

where n is the term numbers, t₁ is the first term, tₙ is the nth term

We want to sum up to 22 terms, so we need to find the 22nd term

Formula for general term of an arithmetic sequence:

tₙ = t₁ + (n-1)d,

where t1 is the first term, n is the term number, d is the common difference. Since first term is 23 and common difference is 4, the general term for this situation is

tₙ = 23 + (n-1)(4)

The 22nd term, which is the 22nd row, is

t₂₂ = 23 + (22-1)(4) = 107

There are 107 seats in the 22nd row.

So we use the sum formula to find the total number of seats:

S₂₂ = (22/2)(23 + 107) = 1430 seats

Total of 1430 seats.
If all the seats are taken, then the total sale profit is

1430 * $29.99 = $42885.70
4 0
3 years ago
P → q is false and p is true.
arlik [135]

Answer:

False??????..........

5 0
3 years ago
Please help me if you can
mezya [45]

answer:

i got the first two

4 0
3 years ago
Write the espression 40w - 16, as a product with a whole number greater then one.
musickatia [10]

Answer:

8(5w - 2).

Step-by-step explanation:

40w - 16

The greatest common factor of the two terms is  8 so the product is:

8(5w - 2).

8 0
3 years ago
Read 2 more answers
In a slope intercept equation , what does “m” represent
-BARSIC- [3]
The slope

Your welcome!! Vote me brainliest
6 0
3 years ago
Read 2 more answers
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