Solve for the equation: 7z = 42 *

What is the value of x in the diagram below?

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

Graph the equationy= x+3[tex]y = x + 3[/tex]