At the national science fair competition, 900 out of 1500 displays were in place for judging. what percent of the spaces were in place for judging

Pls will give brainliest and all p.s u can zoom in if u cant see plss

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be bale to prepare using the sauce?

How do you write something in scientific notation?