Use the right-endpоint Riemаnn sum $$style{fоnt-size:18pt}{R_3}$$ tо write down аn аpproximation to the area under the curve $$style{font-size:18pt}{f(x)=3x^2+1}$$ on the interval $$style{font-size:18pt}{[1,3].}$$Include a sketch which shows the area you are approximating and the approximation that you have built.You should leave numerical values unsimplified.