Applying the 10% rule, if a shrew living in a tropical rain forest has a daily requirement of 500 cal., how many square meters of rain forest are needed to sup- port one shrew th

answer: it is a.,b.,d.

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."