Answer:
The Roses take 32 square feet
Zinnias take 64 square feet
Snapdragons take 96 square feet
Petunias take 128 square feet
Step-by-step explanation:
The Roses take 32 square feet 8x4=32
Zinnias take 64 square feet 8x12=96-32=64
Snapdragons take 96 square feet 16x12=192-96=96
Petunias take 128 square feet 16x20=320-192=128
Hope this helps
