Asolution of cough syrup contains 5.00% active ingredient by volume. if the total volume of the bottle is 51.0 ml , how many milliliters of active ingredient are in the bottle?

The total volume of the bottle is 51.0ml and the active ingredient is 5.00% by volume then multipy 0.05 x 51.0 = 2.55 ml of active ingredient. Being 5% by volume means that of the total 51.0 ml, 5% of it is active ingredient and the balance is inactive or may even be water. 

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.