Answer:
7 plants
Step-by-step explanation:
21 tomato plants in all.
They all have the same number of plants per row.
There are 7 plants in each row.
W=4N+10
N+4N+10=90
5N=80
N=80/5=16
<span>(7x+3)-(2x+1) = 7x+3-2x-1 = 7x-2x + 3-1 = 5x +2</span>
The answer to this is 4x-6