Solve for y, where y is a real number square root of y-9=8

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Find the distance between (0,5) & (-4,2)

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.