If y varies directly as x, and y=-4 when x=8, find y when x=3

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

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

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup