Which is the better deal to buy vegetables at a supermarket? $2.45/2.5lb of potatoes or $0.98/lb of potatoes

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent