It would be 7/13 since 7 balls out of the total 13 are not white.
Answer:
1
Step-by-step explanation:
Given triangle ABC with vertices at points A(2,-4), B(4,-4) and C(4,-2).
1. Rotate this triangle anticlockwise by 90° angle over the origin. This rotation has the rule
![(x,y)\rightarrow (-y,x),](https://tex.z-dn.net/?f=%28x%2Cy%29%5Crightarrow%20%28-y%2Cx%29%2C)
then
![A(2,-4)\rightarrow A'(4,2)\\ \\B(4,-4)\rightarrow B'(4,4)\\ \\C(4,-2)\rightarrow C'(2,4)](https://tex.z-dn.net/?f=A%282%2C-4%29%5Crightarrow%20A%27%284%2C2%29%5C%5C%20%5C%5CB%284%2C-4%29%5Crightarrow%20B%27%284%2C4%29%5C%5C%20%5C%5CC%284%2C-2%29%5Crightarrow%20C%27%282%2C4%29)
2. Reflect triangle A'B'C' across the y-axis. This reflection has the rule
![(x,y)\rightarrow (-x,y),](https://tex.z-dn.net/?f=%28x%2Cy%29%5Crightarrow%20%28-x%2Cy%29%2C)
then
![A'(4,2)\rightarrow A''(-4,2)\\ \\B'(4,4)\rightarrow B''(-4,4)\\ \\C'(2,4)\rightarrow C''(-2,4)](https://tex.z-dn.net/?f=A%27%284%2C2%29%5Crightarrow%20A%27%27%28-4%2C2%29%5C%5C%20%5C%5CB%27%284%2C4%29%5Crightarrow%20B%27%27%28-4%2C4%29%5C%5C%20%5C%5CC%27%282%2C4%29%5Crightarrow%20C%27%27%28-2%2C4%29)
These are vertices of triangle 1
He sold 28 at 0.75 cents and sold 21 at 0.99 cents.
0.85 is between 0.75 and 0.99 so he sells between 21 and 28 donuts.
0.85 is closer to 0.75 ,so the number should be closer to28.
The answer should be b)25
Vertical angles are equal
so
3x - 3 = 6(x - 10)
3x - 3 = 6x - 60
6x - 3x = - 3 + 60
3x = 57
x = 19