7. a plane flying from city a to city b travels x miles per hour for a total

of 4.5 hours. the plane takes the same route on the return trip, traveling

25 miles per hour faster for a total of 4.25 hours. what is the total distance

that the plane travels?

work

your answer would be 12

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.