the supermarket has 21 empty aisles and 9 aisles with shoppers. what percentage of the
aisles in the supermarket are empty?

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?