Can someone help me answer part b please .As I have no idea what it is ?

The coordinates of B is (4,1)

Step-by-step explanation:

You can use the formula of mid-point. It is given that the midpoint of AB is (4,5). So you have to substitute the coordinates of A into the formula :

Let M be (4,5),

Let (x1,y1) be A(4,9),

Let (x2,y2) be B coordinates,

Then you could solve it :

56

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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