By what number must you multiply each side of the equation 3/4x=9 to produce the equivalent equation x=12

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

If a || b and e || f , what if the value of y ?

In a column proof the right column states your reasons