There are 7 students in a class: 2 boys and 5 girls. If the teacher picks a group of 2 at random, what is the probability that every student chosen is a boy?

1/21

Step-by-step explanation:

First pick: 2/7, because there are 2 boys out of 7 children

Second pick: 1/6, since one boy has already been chosen, there is only 1 boy and 6 children left

2/7*1/6=2/42

1/21

a

step-by-step explanation:

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.