The altitude of an airplane is decreasing at a rate 42 feet per second what is the change in altitude of the airplane over a period of 16 seconds

The descent after 16 seconds would be 672 feet, with the function -42•X and X=16 so -42•16=-672

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

The answer is 8 apex