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Zigmanuir [339]
3 years ago
7

A theater has 56 rows of seats. If there are 13 seats in the first row, 18 in the 2nd row, 23 in the 3rd row. How many seats are

there in total
Mathematics
1 answer:
Anna35 [415]3 years ago
4 0

Answer:

8428

Step-by-step explanation:

According to the Question,

  • Given, A theater has 56 rows of seats. If there are 13 seats in the first row, 18 in the 2nd row, 23 in the 3rd row.

We have a number sequence  13, 18, 23, ...

  • We can say that this is an arithmetic sequence because of the common difference 'd', is equal to 5, and the first term 'a1' is equal to 13.
  • The formula for the sum of an arithmetic sequence with n terms is given is S_n= \frac{n}{2} [2a_1+(n-1)d]S .

Substitute the given values into the equation to solve for the sum of the 56 rows of seats.

S_56= \frac{56}{2}[2(13)+(56-1)(5)]\\S_{56}=28\left[26+275\right]\\S_{56}=28\left[301\right]\\S_{56}=8428

Therefore, there are 8428 seats in all.

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liraira [26]
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4 0
2 years ago
What is the slope of a line parallel to the line whose equation is
Lyrx [107]

Answer:

slope = 3

Step-by-step explanation:

The equation of a line in slope- intercept form is

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Given

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8 0
2 years ago
find real numbers a, b, and c so that the graph of the function y=ax^2+c contains the points (-1,6), (2,7), and (0,1)
Paraphin [41]
This gives you three simultaneous equations:

6 = a + c
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<u>c = 1
</u>
<u /><u />
If c =1,

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<u>a = 5
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<u /><u />
This doesn't work in the second equation, so the quadratic that goes through these points is not in the form y = ax^2 + bx + c
Was there supposed to be a b in the equation?




5 0
3 years ago
Answer the questions in the picture ​
Nutka1998 [239]

Answer:

1a 3800, 1b 6300 1c 5100

2a 2630, 2b 2600, 2c 3000

3a 4000, 3b 3000, 3c 8000

7 0
3 years ago
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raketka [301]
<span> 16501 (10^23) • 16501/5000
</span><span> 2.1     10 = 2•5 </span>

<span>(10)^23 = (2•5)^23 = 2^23 • 5^23</span>

<span> 16501 (2^23•5^23) • 16501/5000

</span>
8 0
3 years ago
Read 2 more answers
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