What is the equation of a line that passes through the points (6,9) and is perpendicular to the line

15/16 as a decimal rounded to the nearest hundredth

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot