HELP Solve for the measure of angle H and K

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

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.