What is the mode interval for the set of data? 60 - 69
70 - 79
80 - 89
90 - 99

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Can someone me with this problem i don't understand i need

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.