Mrs. Zarro loves her plants. She knows that 25 of the plants in the her greenhouse use 43 gallons of water. However this is not enough for ALL her plants. How much water is necessary to water all the plants in the house? Write an equation to represent the situation, and then find the answer.

9 x 8 divided by (5-3)=36

c

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."