Spencer can do 3 oil changes in 1 hour. Preston can do 5 oil changes every hour. If they work together how long
would it take them to do 24 oil changes?

3 hours

Step-by-step explanation:

3x + 5x = 24

add 3x and 5x = 8x

8x = 24

÷8 on both sides

x = 3 hours

So sorry if im wrong, I did most of the work in my head! Good luck and I hope I helped you!

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.