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The actual dimensions of a rectangle are 5 in by 9 in. Eric measures the sides to be 4.64 in by 8.92 in. In calculating the area, what is the relative error, to the nearest thousandth.
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The actual dimensions of a rectangle are 55 in by 99 in. Eric measures the sides to be 44.6464 in by 88.9292 in. In calculating the area, what is the relative error, to the nearest thousandth.\newlineAnswer:

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Q. The actual dimensions of a rectangle are 55 in by 99 in. Eric measures the sides to be 44.6464 in by 88.9292 in. In calculating the area, what is the relative error, to the nearest thousandth.\newlineAnswer:
  1. Calculate Actual Area: Calculate the actual area of the rectangle using the actual dimensions.\newlineThe formula for the area of a rectangle is length×width\text{length} \times \text{width}.\newlineActual area = 5in×9in=45in25 \, \text{in} \times 9 \, \text{in} = 45 \, \text{in}^2.
  2. Calculate Measured Area: Calculate the measured area of the rectangle using the measured dimensions.\newlineMeasured area = 4.64in×8.92in4.64 \, \text{in} \times 8.92 \, \text{in}.\newlineLet's perform the multiplication to find the measured area.\newlineMeasured area = 41.3888in241.3888 \, \text{in}^2.
  3. Calculate Absolute Error: Calculate the absolute error by subtracting the measured area from the actual area.\newlineAbsolute error = Actual area - Measured area.\newlineAbsolute error = 45in241.3888in245 \, \text{in}^2 - 41.3888 \, \text{in}^2.\newlineAbsolute error = 3.6112in23.6112 \, \text{in}^2.
  4. Calculate Relative Error: Calculate the relative error by dividing the absolute error by the actual area.\newlineRelative error = Absolute errorActual area\frac{\text{Absolute error}}{\text{Actual area}}.\newlineRelative error = 3.6112in245in2\frac{3.6112 \, \text{in}^2}{45 \, \text{in}^2}.\newlineRelative error 0.0802488889\approx 0.0802488889.
  5. Convert Relative Error: Convert the relative error to the nearest thousandth.\newlineTo round to the nearest thousandth, we look at the fourth decimal place. Since the fourth decimal place is an 88, we round up the third decimal place from 22 to 33.\newlineRelative error 0.080\approx 0.080.

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