Answer:
40 flowers.
Explanation:
The border row is 4 meters long.
1 meter = 100 centimeters
4 meters = 400 centimeters
Mia plants a flower every 10 centimeters.
Divide the available length by the pitch Mia is planting at.
#Flowers = length / pitch
#Flowers = 400 centimeters / 10 centimeters
#Flowers = 40
Mia is able to plant 40 flowers.