Question

Andrea is designing the seating arrangement for a concert in her local park. To give everyone a good view, each row must have 4 more seats than the row before it, and the first row can only have 10 seats. Help Andrea plan the rest of the seating by solving for how many seats are in row 20. Then explain to Andrea how to create an equation to predict the number of seats in any row. Show your work, and use complete sentences.

Answer 1

@Directrix

Answer 2

@robtobey @math&ing001

Answer 3

Is like a sequence of numbers, suppose the first row has 1 seat so the next will have 5 and the third 9 and so on
1,5,9,13,17...
So use the fórmula of the n-term ti find how MANY seats there are in row 20

Answer 4

Got it @zasharra

Answer 5

is it 276?

Answer 6

I can't remember the formula. Can you give me the fórmula?

Answer 7

20*10=200
4*19=76

Answer 8

idk

Answer 9

@Directrix

Answer 10

276?

Answer 11

I think is that
Tn=nr+to

Answer 12

how will the equation go?

Answer 13

T(20)=20(4)-3

Answer 14

And the equation can be
Tn=4n-3 for every row

Answer 15

so am i right abut 276 seats on row 20/

Answer 16

number of seats depends on the number of the row, here's how it goes
first row r(1)=10
r(2)= 10+4
r(n)= 10 +4(n-1)

Answer 17

How did you get 276 ?

Answer 18

20*10=200 4*19=76

Answer 19

then woulnt it be
10
14
18
...so forth?

Answer 20

guys plz help idk this

Answer 21

But how do you knlw row 1 has 10 seats. It says that CAN HAVE 10 seats

Answer 22

Exactly so for 20 it would be 10 +4(20-1) = 86

Answer 23

it's in the question

Answer 24

But can have not have

Answer 25

and @math&ing001 is that the final answer/

Answer 26

Yes and this is the equation to predict the seats in any row r(n)= 10 +4(n-1)

Answer 27

20*4= 80 how u get 86?

Answer 28

why 20*4 they say "4 more seats than the row before" so it addition not multiplication
it's 10+4*19

Answer 29

yea you're right.. THANK YOU SO MUCH. I medal-ed u by the way!!

Answer 30

You're VERY WELCOME =3