Leah and Christopher work at a dry cleaners ironing shirts. Leah can iron 25 shirts per hour, Christopher can iron 15 shirts per hour. Leah can Christopher worked a combined 13 hours and ironed 265 shirts. Write a system of equations that could be used to determine the number of hours Leah worked and the numbers Christopher worked. Define the variables that you use to write the system.

step-by-step explanation:

the true ones are a b and d

where is the gragh

step-by-step explanation:

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.