Answer:
2a-6>=15 this is because the key word at least means it can be 15 or higher but it cannot be less than 15.
Step-by-step explanation:
Step-by-step explanation:

Aren’t there only 2? Because of the squared exponent? I’m not fully sure
Answer:
2592 cm
Step-by-step explanation:
square area = x²
rectangle area = bh
so
x² = bh
since the areas are equal
b and h are in the problem as 64 and 81
x² = 64x81
x² = 5184
divide by 2
x = 2592 cm