Two quantities have a relation between them will have a curved graph

The triangles are similar. what is the value of x? show your work.

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)