51 my dude ..................
I believe it's 1.8, but correct me if I'm wrong.
Answer:

Step-by-step explanation:
Diameter of a model of earth (D) = 25.6 cm
Radius of a model of earth (r) = 
Earth has the shape of a sphere.
Total surface area of a sphere = 
Put 
So,
Total surface area of the model 
Answer:
A has the greater value
Explanation:
-8 is a negative number, so if you multiply it by any positive number greater than 1 it will only go further left on the number line (become “more” negative). However, if you add a positive number to a negative number, it will go further right on the number line.
Proof:
B: -8*3=-24
A:-8+4=-4
-4>-24
I hope this helps!
Answer: 1250 square feet!
Step-by-step explanation:
A (25)=25•(100-2•25)=25•50=1250 Sq Ft