9) From 4 feet above a swimming pool, Susan throws a ball upward with a
velocity of 32 feet per second. The height h(t) of the ball t seconds after
Susan throws it is given by h(t) = – 16t“ + 32t + 4.
a) How long does it take for the ball to reach its maximum height?
b) What is the maximum height of the ball?

4x and 6y

im not sure though

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.