One pipe can fill a pool in 9 hours. Another pipe can fill the pool in 6 hours. How long would it take them to fill the pool if they were working together?

One pipe can fill a pool in 9 hours.

Another pipe can fill the pool in 6 hours.

if they were working together

Hence,

if they working together the poll fills with 3.6 hours

c.35

step-by-step explanation:

8+13=21

21+8=29

29+6=35

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.