Calculate the area of the shaded part of the figure shown in the picture (Solution: 4-pi / 2)

Please help, i will mark the answer as brainlist

What is the size of the matrix resulting from

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

What is the value of x in the following equation? -3x-2=2x+8