If trigonometry is based on right triangles, how can we sensibly consider trigonometric ratios of angles greater than a right angle?

Which of the following are accepted without proof in a logical system? check all that apply.

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?