Can anyone me solve 2y + 4y = 36 ?

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

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16