When Nouyen finished the next level of his video game, he gained 90 points for each of the five targets he hit and was penalized 70 points
for taking too long Wiite the total change to his score as an integer

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step-by-step explanation:

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours

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."