Answer:
66 seats
Step-by-step explanation:
The rate of increase is ...
(change in seats)/(change in rows) = (33 -21)/(7 -3) = 12/4 = 3 . . . seats/row
Then row 18 will have (18-3)·3 = 45 more seats than row 3, hence ...
21 + 45 = 66 . . . . seats in row 18
_____
An explicit formula for the number of seats can be written as ...
s = 21 +3(n-3) = 12 +3n
For n=18, this is ...
s = 12 + 3(18) = 12 +54 = 66 . . . seats in row 18
m = -2
Let (x1 , y1 ) = ( 3 , 8) and (x2 , y2 ) = ( 2 , 10)
Now
slope (m)
= y2 - 1 / x2 - x1
= 10 - 8 / 2-3
= - 2
hope it helps :)
<u>Let the number be x:</u>
It is -4
~
B
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