Find any domain restrictions on the given rational equation x/x+4 + 12/x^2+5x+4 = 8x/5x-15

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?