HELP ASAP A student drops a ball from a height of 71.0m. Determine all
unknowns and answer the following questions. Neglect drag.
How long did the ball remain in the air?
What was the ball's speed just before striking the ground?
m/s

i think 1: 2

step-by-step explanation:

sina-sinb

cosb+cosa

tana-tanb

cos0+cos x pi/3

20tan

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."