Hudson is making smoothies. Each smoothie uses 2/3 cup of yogurt. How many cups of yogurt does he need to make 16 smoothies? Express your answer in simplest form.

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.

Find the percent error of the measurement 4 cm