What does it mean to be equivalent, and how can you tell if two or more equations are equivalent?

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Stephen thublin invests $1,000,000 in a 45-day certificate of deposit with 6.55% interest. what is the total interest income from the investment?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?