Hello! Remember you have to write complete questions in order to get good and exact answers. I'll help you to understand this problem, but I have to assume some things.
We know that the empty cup in the shape of a cylinder is being filled with water. Suppose the volume of this cylinder is:
Suppose that the cup is filled at a constant rate of , so in 7 seconds the cup is filled the following amount:
So this represents the following percentage:
Finally, after 7 seconds the cup is 77.78% filled
10. Not sure what the question is. Looks like it could be to write 9/5 in decimal form? In that case, we have 1/5 = 0.2, so 9/5 = 9*0.2 = 1.8
11. . If we round to 5 decimal places, the approximate value is 52.23232
12. By long division, we can show that . In repeated decimal notation, that's