Let f be the function defined by f(x)=4x. If three subintervals of equal length are used, what is the value of the right Riemann sum approximation for ∫094xdx ? Round to the nearest thousandth if necessary.Answer:
Q. Let f be the function defined by f(x)=4x. If three subintervals of equal length are used, what is the value of the right Riemann sum approximation for ∫094xdx ? Round to the nearest thousandth if necessary.Answer:
Determine Subinterval Length: To approximate the integral of f(x)=4x from 0 to 9 using a right Riemann sum with three subintervals of equal length, we first need to determine the length of each subinterval. The interval [0,9] is divided into three equal parts, so each subinterval has a length of 39=3.
Find Right Endpoints: Next, we need to find the right endpoints of each subinterval. Since we are using a right Riemann sum, we will evaluate the function at these right endpoints. The right endpoints are x=3, x=6, and x=9.
Evaluate Function at Endpoints: Now we evaluate the function f(x)=4x at each of the right endpoints. This gives us f(3)=43, f(6)=46, and f(9)=49.
Calculate Function Values: We calculate the values: f(3)=43≈4×1.732=6.928, f(6)=46≈4×2.449=9.796, and f(9)=49=4×3=12.
Calculate Riemann Sum: The right Riemann sum is the sum of the products of the function values at the right endpoints and the length of each subinterval. So, the right Riemann sum R is R=(f(3)+f(6)+f(9))×length of subinterval.
Substitute Values: Substitute the values we found into the Riemann sum formula: R=(6.928+9.796+12)×3.
Perform Calculation: Perform the calculation: R=(6.928+9.796+12)×3≈28.724×3≈86.172.
Round Result: Round the result to the nearest thousandth: R≈86.172.
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