The price of a cup of coffee has risen $2.70 today. yesterday's price was $2.45. find the percentage increase. round your answer to the nearest tenth of a percent

Can someone explain the elimination method to me for this problem?

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)