Darnell and Stephanie have competing refreshment stand businesses. Darnell's profit can be modeled with the polynomial 7c2 + 120 -250, where is the number of items sold. Stephanie's profit can be modeled with the polynomial 4c2 - 9c - 178. Show your work.

a. Write a polynomial that represents the difference between Darnell's profit and Stephanie's profit.

b. Write a polynomial to show how much they can expect to earn if they decided to combine their businesses.

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed