1. a) What is the area of this square with sides of 5x4y²?

Area=?
A=a^2
A=(5x4y^2)^2
A=25x^2•16y^4

The answer is 40 degrees. angle x and angle y form vertical angles, therefore x = y. angle y forms a straight line with the 80° angle and the 60° angle which means that 80° + 60° + y = 180°. 140° + y = 180°. y = 180° - 140°. y = 40°. as mentioned earlier: x = y, so x = y = 40°.i hope that my answer is ! let me know if you need something more : )