Find the square root of 85 corrected to nearest 10

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10