a skyscraper contains 80 floors, with adjacent floors 10 feet apart. an elevator in the skyscraper is ascending at a rate of 5 feet per second. how long will it take the elevator to ascend from the 4th floor to the 28th floor?

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Which number produces a rationale number when multiplied by 1/5