Rodrigo practiced playing the guitar 16 1/3 hours over the past 3 weeks. He practiced for 6 1/4 hours during the first week and 5 2/3 hours during the second week. How much time did Rodrigo spend practicing during the third week?

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *