When there are no lines, there is one region: (l, r) = (0, 1).
When there is one line, there are two regions: (l, r) = (1, 2).
When there are two lines, there are 4 regiions: (l, r) = (2, 4).
When there are 3 lines, there are 7 regions: (l, r) = (3, 7).
Each line adds a number of regions equal to its line number, so the total number of regions is one more than the sum of numbers 1 to l.
... r = (l)(l+1)/2 + 1
it was 1/2 full add 7 gallons it is 3/4 full
so 7 gallons = 1/4 of the container ( 3/4-1/2 = 1/4)
so 7 x 4 = 28
container can hold 28 gallons.
Answer:
Solve the hard question that nobody can solve it
Step-by-step explanation:
17 - 8 =
17-8= 9
your answer would be 9