What of the following is a like radical to ^3 square 7x

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.)

Which statement best describes the polynomial

What is sin 7x/4 ? i need on this urgent trig