The circumference of a circle with radius 10 cm is 62.8 cm. The circumference is proportional to the radius. Find the constant of proportionality in relation to
circumference and radius of the circle.

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

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

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years