Can someone pls help me find the value of b and x??

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

Miguel’s teacher asks him to color 4/8 of his grid. he must use 3 colors: red, blue, and green. there must be more green sections than red sections. how can miguel color all the sections of his grid to follow all the rules