Please help, In circle M the picture is there

Write the expression as a single natural logarithm. 2 in a - 4 in y

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)