There are three points in the triangle (not on the edge), together with the three vertices of the original triangle, a total of six vertices. With these six vertices, we can make all non overlapping triangles. How many are there?

C(6,3)
=20
20 in total

When someone leaves home at six o'clock in the evening, the angle between the hour hand and the minute hand is 110 degrees. When they go home, they find that it is not seven o'clock, and the angle between the hour hand and the minute hand is still 110 degrees. Please calculate how long this person has been away?

If you go out at 6:00, because the angle between the hour hand and the minute hand on the watch is 110 degrees, you have 180 + 0.5x-6x = 110, so 5.5x = 70, so x = 14011, so the person goes out at 6:14011; if you go back at 6:00, you will find that the angle between the hour hand and the minute hand is 110 degrees, so you have 180 + 0.5x-6x = 110 6y - (180 + 0.5y) = 110, so 5.5y = 290, so y = 58011, so the person returned at 6:58011, 58011-14011 = 44011 = 40 (minutes). A: that is, the person went out for 40 minutes

I'm going to have it tomorrow (1 21:19:9)
It is known that y is the inverse proportional function of X and X is the positive proportional function of Z. please judge the functional relationship of Y with Z and explain the reason

The answers are as follows;
Let y be the inverse proportional function of X, then y = m / X
Because x is a positive proportional function of Z, we can get: x = NZ
So y = m / x = m / NZ
Obviously, y is inversely proportional to Z
Note: "because" so "can be written as" three black spots "that you often use to do questions

Given the equation 3x-2y = 1, if y is expressed by an equation containing x, then y=_________ .

y=（3X-1）/2

There are three points in the triangle (not on the edge), together with the three vertices of the original triangle, a total of six vertices. With these six vertices, we can make all non overlapping triangles. How many are there?