It has a minimum point at (1,1.5)\left(1,1.5\right) (1,1.5) left parenthesis, 1, comma, 1, point, 5, right parenthesis and an amplitude of 1.51.5 1.5 1, point, 5

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be

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."