Answer:
1200 ml per hour
Step-by-step explanation:
To compute what rate is 300 ml over 15 mins as a rate of ml per hour, we do a rule of 3, using a variable x as that amount of ml we don't know yet. We should have everything in the same units, so instead of writing 1 hour we write 60 minutes:

Now we solve for x:



And so, now that we know the value of x, the rate we wanted to find is

Which is just 1200 ml per hour.
2/8.
You take two pizzas and divide them by 8.
You can approach this question by writing the function as y=… as I did in the photo. Then rearrange to make x the subject. Lastly, swap the ys for xs and write as I did on the final line of my working. If you like I can explain how to rearrange the equation or answer any other questions but I think you should be able to see
16x^3 + 28x^5y = 4x^3(4 + 7x^2y)
Therefore, the gcf is 4x^3