Answer:
80 plants
Step-by-step explanation:
Area of garden, [tex]A=20 ft\times 10 ft=200 ft^{2}[/tex]
4 plants cover 10 sqrt ft
x plants cover 200 sqrt ft
[tex]x=\frac {4\times 200}{10}=80 plants[/tex]
Therefore, Linda requires 80 rose bushes to cover her rectangular garden