Find the balance in the account. $4,100 principal earning 2.25%, compounded semi-annually, after 12 years

a. $5,362.76

b. $5,354.80

c. $4,689.07

d. $100,614.00

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

I'm confused on this could anyone me and show me what i need to do to solve it.