Answer:

Step-by-step explanation:

1000 g boxes costing 19.50
Mike's plant plant height grew by 3 in
Lauren's grew 2 1/2 times of 3 in
So, 2 1/2 times of 3 in
= 2 1/2 x 3
= 5/2 x 3
= 15/2 = 7 1/2 inches
Hope This Helps You;
If it is cylindrical, the circumference is the diameter x pi. If it is rectangular, it is the length of the sides added together.