3500 by Road over 5 years with an interest rate of 4% what's the interest

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Need showing work for this problem 56.25 ×25.80