The picture shows a triangular island:
a right triangle is shown with an acute angle equal to 55 degrees. the length of the side of the triangle opposite to the acute angle is r. the length of the side of the triangle adjacent to the acute angle is s. the length of the hypotenuse is q.
which expression shows the value of q?
r cos 55°
r sin 55°
s over sin 55 degrees
s over cos 55 degrees

answer: need a picture

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."

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