An airplane is getting ready to land. It has 12 km to go and is decreasing at an angle of 50 degrees with the ground. What height is the airplane at before the descent? Round your answer to the nearest WHOLE NUMBER

definitely a. the others have almost all data points on one side of the line.

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."

the correct answer would be c