Find the missing ratio ___ : 6 : 3 = 21 : 18 :

4: ___ : 3 = ___ : 24 : 9
theses mean the blank

How do i do this activity, is appreciated

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? *

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.