1x=-1
that means whererever you see x, you replace it with -1
x is a placeholder for an unknown number
so repolace it
-1+5=4
5-1=4
true
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 
483/14=34.,5
600/34.5= 17.29130435 (answer) but not wounded
Answer:
<em>x </em>
12
Step-by-step explanation: