What is 20% tip on a bill of $404.51 (you round the bill to the nearest tenth)

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.