In quadrilateral abcd, ae equals x +10 be equals 3x -18 for what value of x is abcd rectangle

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

The price of a visit to the dentist is calculated according to the formula 50+100n50+100n where nn is the number of cavities the dentist finds. on your last visit to the dentist, 22 cavities were found. what was the cost of your visit?