Last year, Lena had $10,000 to invest. She invested some of it in an account that paid 8% simple interest per year, and she invested the rest in an account that paid 5% simple interest per year. After one year, she received a total of $770 in interest. How much did she invest in each account?

What do economists mean when they use the latin expression ceteris paribus?

The following information relates to wagner, inc.: advertising costs $ 18 comma 600 administrative salaries 17 comma 800 delivery vehicle depreciation 1 comma 500 factory repair and maintenance 600 indirect labor 10 comma 000 indirect materials 18 comma 000 manufacturing equipment depreciation 3 comma 000 office rent 58 comma 000 president's salary 1 comma 100 sales revenue 600 comma 000 sales salary 5 comma 200 how much were wagner's period costs

Simon, aged 10, is invited to a classmate's birthday party at an exclusive ski resort on march 15th. the day will include 4 hours of snowboarding, lunch and birthday cake. simon's mother checks a box on the invitation that says "yes, we will attend" and returns it to the classmate's address. unfortunately, they later don't attend the party when simon comes down with the flu. on march 17th, simon's mother receives an invoice in the mail from simon's classmate for $35 that says, "party no-show fee." can simon's classmate collect the fee?