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Let 
f be the function defined by 
f(x)=x^(2). If four subintervals of equal length are used, what is the value of the right Riemann sum approximation for 
int_(2)^(6)x^(2)dx ?
Round to the nearest thousandth if necessary.
Answer:

Let f f be the function defined by f(x)=x2 f(x)=x^{2} . If four subintervals of equal length are used, what is the value of the right Riemann sum approximation for 26x2dx \int_{2}^{6} x^{2} d x ?\newlineRound to the nearest thousandth if necessary.\newlineAnswer:

Full solution

Q. Let f f be the function defined by f(x)=x2 f(x)=x^{2} . If four subintervals of equal length are used, what is the value of the right Riemann sum approximation for 26x2dx \int_{2}^{6} x^{2} d x ?\newlineRound to the nearest thousandth if necessary.\newlineAnswer:
  1. Determine Width of Subintervals: Determine the width of each subinterval. Since we are integrating from x=2x = 2 to x=6x = 6, the total interval length is 62=46 - 2 = 4. With four subintervals of equal length, each subinterval will have a width of 44=1\frac{4}{4} = 1.
  2. Identify Endpoints of Subintervals: Identify the endpoints of each subinterval. The subintervals are [2,3][2, 3], [3,4][3, 4], [4,5][4, 5], and [5,6][5, 6]. Since we are using a right Riemann sum, we will evaluate the function at the right endpoints of each subinterval, which are x=3x = 3, x=4x = 4, x=5x = 5, and x=6x = 6.
  3. Evaluate Function at Endpoints: Evaluate the function at each right endpoint.\newlinef(3)=32=9f(3) = 3^2 = 9\newlinef(4)=42=16f(4) = 4^2 = 16\newlinef(5)=52=25f(5) = 5^2 = 25\newlinef(6)=62=36f(6) = 6^2 = 36
  4. Calculate Rectangle Areas: Multiply each function value by the width of the subintervals to find the area of each rectangle. Since the width of each subinterval is 11, the area of each rectangle is simply the function value at the right endpoint. Area of rectangle 11: 1×f(3)=1×9=91 \times f(3) = 1 \times 9 = 9 Area of rectangle 22: 1×f(4)=1×16=161 \times f(4) = 1 \times 16 = 16 Area of rectangle 33: 1×f(5)=1×25=251 \times f(5) = 1 \times 25 = 25 Area of rectangle 44: 1×f(6)=1×36=361 \times f(6) = 1 \times 36 = 36
  5. Sum Areas for Riemann Sum: Sum the areas of the rectangles to find the right Riemann sum approximation.\newlineRight Riemann sum =9+16+25+36=86= 9 + 16 + 25 + 36 = 86

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