There are 777 students in a class: 555 boys and 222 girls. if the teacher picks a group of 444 at random, what is the probability that everyone in the group is a boy?

1/7

Step-by-step explanation:

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a reflection across the x axis and a 90 degree rotation left and right.

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus