The lines represented by the equations y = 5x + 7 and 25y - 5x = 125 are

What is the total surface area of this square pyramid?

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.