If 4/25=?/20 then what is the missing number

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone.which are equivalent equations?

The distance between two cities is 368 miles. if the scale on the map is 1/4 inch=23 miles, what is the distance between the cities on the map?

In which form is the following function written? y = - 2(x – 3)(x + 5)