Ultrasound is often used to make images of developing fetuses. In particular, by measuring the...

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Ultrasound is often used to make images of developing fetuses. In particular, by measuring the size of a fetus ultrasoundand then predict its birthdate. To do this requires formulas for fetus size as a function ofage. Verburg et al. (2008) fit data from over 6000 fetal ultrasounds. They measured the femur length, L, (in mm) as afunction of the fetus age,, (in weeks) and found the following formula:Calculated when t = 20.L = -37.50 +3.71t - 0.000633tDoes the rate of growth of the fetus increase or decrease as it ages?A. Increases and decreasesB. IncreasesC. DecreasesD. Not enough information to tell

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