You and your business partner track the number of customers served and the amount of tips collected per day. The data you gathered is displayed in the chart below. b) Find the equation of the trend line (line of best fit). Show your work. (2 points) d) Explain how to use the regression calculator to make a reasonable prediction given a data table. (2 points) please i need hel

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step-by-step explanation:

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."