For each right triangle below, find all unknown side lengths and angle measures: can anyone help for number 8 and 9

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Jose is going to use a random number generator 500500 times. each time he uses it, he will get a 1, 2, 3,1,2,3, or 44.

Which of the following domains provide a real value periods