An environmentalist wants to measure the width of a river to monitor its erosion. From point A, she walks
downstream 100 feet and measures the angle from this
point to point C to be 40 degrees.
How many feet wide is the river? Round to the nearest
tenth.

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.