Trinomials are three term algebraic expressions typically featuring variables to exponent powers. To break these trinomials down we factor them using the diamond method or GCF. The diamond method states that for a trinomial multiply a*c then find two numbers which multiply to this number and add to b. When you find those numbers, write them as .
Easy when rock is in water, it takes up a certain volume, say x so initial+x=final volume luckily we have final and inital 13.7ml+x=28.9ml minus 13.7ml both sides x=15.2ml