Keith will rent a car for the weekend. He can choose one of two plans. The first plan has an initial fee of $55 and costs an additional $0.30 per mile driven. The second plan has no initial fee but costs $0.80 per mile driven.

could

step-by-step explanation:

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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."