Hai vòi cùng chảy vào một bể sau 10h sẽ đầy, nếu mở vòi 1 trong 6h rồi khóa lại và mở vòi 2 trong 3h thì đầy 2/5 bể. Hỏi nếu mở riêng mỗi vòi sau bao lâu sẽ đầy bể

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

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

Jada has a monthly budget for her cell phone bill. last month she spent 120% of her budget, and the bill was 60$. what is jada’s monthly budget