Regroup to express the number in a different way. 57,270=

​

5 ten thousands+7 thousands+2 hundreds+7 tens

4 ten thousands+★ thousands+2 hundreds+7 tens

★=

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

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? *

The longer leg of a 30-60-90 trangle is 18