Ethan's yearly salary is $75,000. Write this number in a Scientific notation. I feel stupid asking this is review omg

Y=4x^2+x-1 solve using quadratic formula

1. what is the phythaforean theorem? 2.what do we use it for? 1.what is the distance formula ? 2.what do we use it for?

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.