Which number produces a rational number when multiplied by 0.5

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?

What is 2,489,287 divided by 7,482 to the nearest power.