Harper wrote the expression 15-6+7 to represent "15 minus the sum of 6 and 7". evaluate 15 - 6 + 7 and then exposing why harper's expression is incorrect

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

Meee i honestly dont know what this question talking about

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?