What is -2f + 4/5f ? - 4/5f is a fraction by the way.

The full equation is
8 - 4/5f = -14 -2f

-Please show work too :))

-I’m stuck on this problem

Find the commission on a $590.00 sale if the commission is 15%.

98 point question what is the record for most points in one

Maria has $10,000 to invest in two accounts. he decides to invest one part in an account with 5% interest and the rest in an account with 8% interest. at the end of the year he has earned $702,50 in interest.¿how much did maria invest in the 8% account?