You need to buy fertilizer for a circular flower bed with a diameter
of 13 feet. if one bag will fertilize 10 square feet, how many bags
do you need to buy?

14 bags of fertilizer are needed

Solution:

Given that You need to buy fertilizer for a circular flower bed with a diameter

of 13 feet

Diameter = 13 feet

Therefore radius of circular flower bed is 6.5 feet

Area of circle is given as:

Substitute r = 6.5

Given that one bag will fertilize 10 square feet

1 bag = 10 square feet

Then number of bags needed are:

Thus approximately 14 bags of fertilizer are needed

the answer is a if my teacher taught me correct