Which of the following is the independent variable of g(f(y))

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

Ateacher brought a pack of 17 batteries . each calculator uses 3 batteries . how many calculator can the teacher fill with batteries

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get