I'm here to help. Those 3 points all lie on the same line. We know this because if we find the slope between any 2 of those points, it is the same. I'll show you:

. Now another 2 points:

. The same holds for the first and third points. So we got that out of the way. Now we will pick any one of those points and use the x and y values and our slope to write an equation of that line and then finally solve for the x and y intercepts. I'm going to use the first point (10, 20):

. We will simplify to get it into y = mx + b form:

and

and finally,

. The y-intercept exists when x = 0, so when x = 0, y = 36. The x-intercept exists when y = 0, so when y = 0, x = 22.5. In summary, y-intercept: (0, 36). x-intercept: (22.5, 0) and you're all done!
There are
ways to select 3 from 9.
There are
ways to select 3 men from 5 men and
ways to select 3 women from 4 women.
If all three selected are men, then no woman was selected, and we have
ways we can do that.
1)
![P(All -3 -are -men)=[tex]\frac{5C_3 \times 4C_0}{9C_3}=\frac{5}{42}](https://tex.z-dn.net/?f=P%28All%20-3%20-are%20-men%29%3D%5Btex%5D%5Cfrac%7B5C_3%20%5Ctimes%204C_0%7D%7B9C_3%7D%3D%5Cfrac%7B5%7D%7B42%7D)
2) If all 3 are women then no man was selected, and we have
ways we can do that.

3) If 2 men and 1 woman were selected, the we have
ways we can do that.

4) If 2 women and 1 man is selected, then we have 

24 because if you put two triangles together they make a Rectangle
It would include 25 gifts for the cost the same amount either way
<em><u>Solution:</u></em>
Let "a" be the number of gifts to be wrapped
He can get them wrapped at the department store, which charges $2 per gift
Therefore,
Cost at department store: 2(number of gifts)
Cost at department store: 2a
The customer can pay his niece a flat fee of $50 to wrap all of his gifts
Cost at his niece: 50
He has a certain number of small packages, it would cost the same amount either way
Therefore,
Cost at department store = Cost at his niece
2a = 50
Divide both sides by 2
a = 25
Thus it would include 25 gifts for the cost the same amount either way