How many sixths are there in 8 1/2?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Ana earns 2.5% simple interest on $2,000 in her savings account. she does not make any deposits or withdrawals. after 3 years, how much interest will ana have earned on her savings account?