A hall has 22 rows of chairs there are 18 chairs in each row how many extra rows of chairs are needed to seat 468

Total chairs = 18×22= 396

so no. of extra chairs need = 468-396 = 72

Now( 72/18) rows = 4 rows

Therefore 4 more rows are needed here

Hope it helps you

4

Step-by-step explanation:

The amount of chairs in the hall can be found by multiplying 22 by 18 and getting 396. The amount of chairs needed is 468, so 468-396 gets you the amount of chairs still needed and the number 72. There are 18 chairs in each row, and 72/18 is 4. So 4 more rows are needed.

the answer is a) y= 2 csc [0.5 (x+pi/2)]-1

step-by-step explanation:

b is the right answer