Use the information about rational expressions on page 442 to explain how rational expressions are used in mixtures. Include an example of a mixture problem that could be represented by _8 + x 13 + x + y .

L6 - 2 Position Functions ex. Suppose that as an object falls from the top of a cliﬀ, its position in feet above the ground after t seconds is given by the formulas(t)=1 60 − 16t . 1) Find the average velocity of the object on the time interval from t =1to t =3. 2) Find the average velocity on the time interval t =1t o t =2.