If cos f° = four ninths and the measure of segment xw is 16 units, what is the measure of segment xy?

triangle xyw in which angle w is a right angle, angle x measure f degrees, and angle y measures d degrees

16 units
27 units
30 units
36 units

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Someone answer this check out the image!

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?