For the following graph, write a Reimann sum using left endpoints to approximate the area under the curve over [0,6] with 6 subintervals.

Evaluate the following summation: 

${\sum }_{i=0}^{4}2i+1$

Evaluate the following summation: 

${\sum }_{i=1}^{2}4i^3-3i^2+2i-1$

Evaluate the following summation (make sure your solution is in radians):

${\sum }_{k=0}^{5}2\tan \left(\frac{\pi k}{3}\right)-\pi k$

For the following graph, write a Reimann sum using left endpoints to approximate the area under the curve over [0,5] with 5 subintervals.

Write the Riemann sum that would approximate the area of the following graph over the interval [0,3] using 3 subintervals.

Approximate the area under the curve $f\left(x\right)=\sqrt{x+3}$ over the interval $[1,5]$ using the Right Riemann sum with 8 subintervals.

Approximate the area under the curve $f\left(x\right)=\frac{2}{3x+5}$ over the interval $[4,10]$ using the Midpoint Riemann sum with $n=3$ subintervals.

Evaluate the following summation: 

${\sum }_{i=1}^4{i}^2-3i+8$