The length of a rectangular block of wood is twice its width. The width of the block of wood is 13 inches. What is the total volume of the block of wood.

step-by-step explanation:

what was your answer?

english maybe i can ..

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."

8p+(-9)

(-9)3p+5p and you can swith em around