Decrease £680 by 10% ?

What is the total surface area of this square pyramid?

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p

Could someone me with this question i’ve been stuck on it for 20 minutes