Final answer:
Farmer Joe uses 3.6 bags of fertilizer each month by multiplying his weekly usage of 9/10 of a bag by the average number of weeks in a month, which is 4.
Step-by-step explanation:
To calculate the number of bags of fertilizer Farmer Joe uses every month, we need to multiply the weekly usage by the number of weeks in a month. Since Farmer Joe uses 9/10 of a bag of fertilizer each week, and assuming a typical month has about 4 weeks, we would multiply 9/10 by 4.
Here is the step-by-step calculation:
- Multiply the fractional amount of weekly usage (9/10) by the number of weeks in a month: 9/10 x 4.
- Simplify the calculation: (9 x 4) / 10.
- Complete the multiplication: 36/10.
- Reduce the fraction to simplest form if necessary. In this case, 36/10 simplifies to 3.6, which means Farmer Joe uses 3.6 bags of fertilizer every month.