It will take 80 minutes to fill the pool 20x4=80
Answer:
see explanation
Step-by-step explanation:
4x + 10 = 2y - 4x ( add 4x to both sides )
8x + 10 = 2y , that is
2y = 8x + 10 ( divide through by 2 )
y = 4x + 5
then
x = 2 : y = 4(2) + 5 = 8 + 5 = 13
x = 4 : y = 4(4) + 5 = 16 + 5 = 21
x = - 1 : y = 4(- 1) + 5 = 1
so table is
x y
-----------
2 13
4 21
- 1 1
Answer:
240
Step-by-step explanation:
20% of the students like rock and 40% like hip-hop. That means that 60% of the 360 students would be expected to choose one of the two. Because you don't know the other 10%, you would assume that they would have the same ratio of students who like the country to those who like rock and hip-hop. 60 is 2/3 of 90, so you would expect 2/3 of the students to like hip-hop or rock. 2/3 of 360 is 240.
(this is not my handlely work; I not very good at explaining)
If the plain takes 15 minutes, divide 60 by 15, because 60 minutes equals 1 hour, and the train travels at 80 miles per hour. And that equals 4, so then divide 80 by 4 and that's your answer...20