Farmer Bob got a new shipment of sunflower seeds from his supplier. The supplier recommends that they be planted one seed per square foot. If his field is eighty-four yards long and twenty-five yards wide, how many sunflower seeds should he plant in the field?

First, we need to convert the dimensions of the field from yards to feet.

84 yards x 3 feet per yard = 252 feet

25 yards x 3 feet per yard = 75 feet

Now we can calculate the total area of the field:

252 feet x 75 feet = 18,900 square feet

Since the supplier recommends one seed per square foot, Farmer Bob should plant 18,900 sunflower seeds.

To calculate the number of sunflower seeds Farmer Bob should plant in his field, we need to find the total number of square feet in the field and then multiply that by the recommended planting density of one seed per square foot.

First, let's convert the dimensions of the field from yards to feet:
- Length: 84 yards = 84 * 3 = 252 feet
- Width: 25 yards = 25 * 3 = 75 feet

Next, we can calculate the area of the field in square feet:
Area = Length * Width = 252 feet * 75 feet = 18,900 square feet

Finally, we can determine the number of sunflower seeds Farmer Bob should plant:
Number of seeds = Area * Planting density = 18,900 square feet * 1 seed/square foot = 18,900 seeds

Therefore, Farmer Bob should plant 18,900 sunflower seeds in his field.