Identify the integral that represents the area under f(x)=x2f(x) = x^2f(x)=x2 from x=0x=0x=0 to x=3x=3x=3.
∫03x2 dx\int_{0}^{3} x^2 \, dx∫03x2dx
∫032x dx\int_{0}^{3} 2x \, dx∫032xdx
∫03x3 dx\int_{0}^{3} x^3 \, dx∫03x3dx
∫03x dx\int_{0}^{3} \sqrt{x} \, dx∫03xdx