Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. when completing the job together, which expression would be used to represent the amount of work done by person 1?

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily