The answer would be D. Because there was 19 in total and you took a marble out so that makes it 18 then you want the probability of the blue so 4/18 which equals 2/9
Hope this helps
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Let the base price be x, cost of tow package be y and cost of hard be z.
So equation for three variables are,
![x+y=24290](https://tex.z-dn.net/?f=x%2By%3D24290)
![x+y+z=25285](https://tex.z-dn.net/?f=x%2By%2Bz%3D25285)
![x+z=24890](https://tex.z-dn.net/?f=x%2Bz%3D24890)
Substract equation x + z = 24890 from equation x + y + z = 25285 to obtain the value of y.
![\begin{gathered} x+y+z-(x+z)=25285-24890 \\ y=395 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20x%2By%2Bz-%28x%2Bz%29%3D25285-24890%20%5C%5C%20y%3D395%20%5Cend%7Bgathered%7D)
Substract equation x + y = 24290 from x + y + z = 25285 to obtain the value of z.
![\begin{gathered} x+y+z-(x+y)=25285-24290 \\ z=995 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20x%2By%2Bz-%28x%2By%29%3D25285-24290%20%5C%5C%20z%3D995%20%5Cend%7Bgathered%7D)
Substitute the values in the equation x + y +z = 25285 to obtain the value of x.
![\begin{gathered} x+395+995=25285 \\ x=25285-1390 \\ =23895 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20x%2B395%2B995%3D25285%20%5C%5C%20x%3D25285-1390%20%5C%5C%20%3D23895%20%5Cend%7Bgathered%7D)
So base price is $23895, cost of tow package is $395 and cost of hard top is $995.
Selling price-store's cost
39-26=13
$13 is the amount added.
To find the % of the markup:
Amount added/store's cost
13/26=1/2
50%
Coordinates of Midpoint, knowing A(x₁, y₁) and B(x₂, y₂) is
x(of midpoint) = (x₁+x₂)÷2
y(of midpoint) = (y₁+y₂)÷2
Let A(4, -2) be one end point and B(x₂, y₂) , the other end point. Moreover the coordinate of the midpoint are given= M(1/2, 0)
1) x(of midpoint) = (x₁+x₂)÷2 = (4+x₂)÷2 , but x(of midpoint) = 1/2
Then 1/2 = (4+x₂)÷2 and x₂ = -3
2) y(of midpoint) = (y₁+y₂)÷2 = (-2+y₂)÷2 , but y(of midpoint) = 0
Then 0 = (-2+y₂)÷2 and y₂ = 2
Hence the pair of the other end is B(-3,2)