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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

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Which of the following vectors are orthogonal to (2,1)? check all that apply