\f. [010.5 Poi nts] PREVIOUSANSWERS MYNOTES H ASKYOURTEACHER H PRACTICEANOTHER In a study, researchers followed the development of the cortex, the thinking part of the brain, in a group of children. Using repeated magnetic resonance imaging scans from childhood to the latter teens, they measured the thickness (in millimeters) of the cortex of children of age tyears with the highest IQs121 to 149. These data lead to the model SH) = 0.000987t3 7 0.0491t2 + 0.7116t+ 1.46 (5 5 t S 1.9). At what age do children with supenor intelligence reach the maximum thickness of the cortex? Round your answer to one decimal place. 22 x