How do u add and subtract mixed numbers 2 6/25-1 1/10

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)