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katen-ka-za [31]
3 years ago
11

The corner section of a football stadium has 6 seats on the first row. Each row after that has an additional 3 seats. How many s

eats would be on the 20th row?
32


63


103


342
Mathematics
1 answer:
julia-pushkina [17]3 years ago
7 0

9514 1404 393

Answer:

  63

Step-by-step explanation:

The number of seats in a row will give an arithmetic sequence:

  6, 9, 12, 15, ...

The first term is 6; the common difference is 3. The general term is ...

  an = a1 +d(n -1) . . . . . . n-th term of sequence with first term a1, difference d

The 20th term of the sequence is ...

  a20 = 6 +3(20 -1) = 6 +57 = 63

There would be 63 seats on the 20th row.

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A retailer ordered a combination of 50 black and white sweatshirts. Each white sweatshirt cost him $10 and
Brut [27]

The number of white  sweatshirts is 28

Step-by-step explanation:

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Simultaneous equation :brainly.com/question/12919422

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