What is 1350 as a fraction

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

What is the total surface area of this square pyramid?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?