In a class of 888, there are 333 students who have done their homework. If the teacher chooses 222 students, what is the probability that both of them have done their homework?

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

What is the number 321,000,000 in scientific notation? also what is the number? ?

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?