Determine the vertical reaction at support A. Express your answer as an expression in terms of the variables w and L and any necessary constants. Make your answer positive if the reaction is upward, negative if the reaction is downward.

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b.s. and b.s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.