What is the center of the hyperbola whose equation is (y+3)^2/81 - (x-6) ^2/89= 1?

Aright triangle includes one angle that measures 30º. what is the measure of the third angle? a. 30º b. 90º c. 60º d. 130º

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?

Ineed to know the answer to this algebra question.