$(1$ point$)$ A right Riemman sum is a Riemann that uses righthand endpoints for test points. The following is a right Riemann sum for the definite integral ${\displaystyle \underset{4}{\overset{b}{}}}f(x)dx$

${\displaystyle \underset{i=1}{\overset{n}{}}}f(x_i)x=\sqrt[\phantom{2}]{6+\frac{4}{n}}*(\frac{4}{n})+\sqrt[\phantom{2}]{6+\frac{8}{n}}*(\frac{4}{n})+$dots$+\sqrt[\phantom{2}]{6+\frac{4n}{n}}*(\frac{4}{n})$

In this case, we must have that

$b=$

and

$f(x)=$

$$

Alternatively, we could consider this sum as a Riemann sum for the integral ${\displaystyle \underset{6}{\overset{c}{}}}g(x)dx,$ also using righthand endpoints as test points. In this case, we must have that

$c=$

$$

and

$g(x)=$

$$