The first row has 20 + 0 seats, the 2nd row, 20 + 1, 3rd row 20 + 2 . . . until 60th row has 20 + 59 (not 60 as the first row had 0 added on.
therefore you need to add up 20 + 21 + 22 . . . all the way to 76, 77, 78, 79.
79+ 21 = 100, 78 + 22 = 100, 77+ 23 = 100, in fact up to 49 + 51 = 100
That gives us 39 x 100 and add on the the other rows + 20 + 50
= 3970 seats
6 tenths or 6/10
it doesn't matter how many zeros you have after the .6 it's still 6 tenths. It can have a hundred zeros it will still be just .6 = 6/10 = 6 tenths
Hope that helps you. :-)
Answer:
30 and -3
Step-by-step explanation:
30 x -3=-90
30-3=27
