Estimate the answer by rounding each fraction to the nearest whole number and then adding

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?