Riemann Sum

Determine $$\int_0^8x^2dx$$  using an estimate of 4 equivalent based trapezoids

Determine $$\int_0^480-x^3dx$$  using an estimate of 4 equivalent based trapezoids

Approximate the area under  $$f\left(x\right)=x+3$$  on [-2, 6] using n= 4 trapezoids. 

Approximate the area under $$f\left(x\right)=\frac{x^2}{2}-x+1$$   on [-3,1] using n =4 trapezoids. 

Approximate the area under $$f\left(x\right)=-\frac{2}{x}$$  on [-6,-2] using n = 4 trapezoids.

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A Riemann Sum uses rectangles to

What is the value of the Riemann sum?