Is seven eighths greater than two eights

What is the square root of 45? (step by step working plz)

If g^-1(x) is the inverse of g (x) which statement must be true

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.