Hello! I am a senior in high school who is taking AP Calculus. I'm stuck on this problem. I tried several methods to solve this, but couldn't match any of my answers with the choices. Any help would be wonderful. Thank you in advance!

If $\displaystyle \int^3_{0}f(x)dx=6$ and $\displaystyle \int^5_{3}f(x)dx=4$, then $\displaystyle \int^5_{0}(3+2f(x))dx=$