so you take -10.5+5.3+20.2=??
-10.5+5.3=-5.2
-5.2+20.2=15
Ur Answer Is 15
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The formula is 2(wl+hl+hw) to calculate surface area fo a rectangular prism.
Answer:
Step 1: Distribute
to
and 
Step 2: Subtract from both sides of the equation 
Step 3: Add to both sides of the equation
Step 4: Divide both sides of the equation by 
Step-by-step explanation:
Step 1: Apply the Distributive Property. Then you must distribute
to
and 
Then:

Step 2: You must apply the Subtraction property of Equality and subtract
from both sides of the equation. Then:

Step 3: You must apply the Addition property of Equality and add
to both sides of the equation. Then:

Step 4: You must apply the Division property of Equality and divide both sides by
. Then:

The length of the edge would be 5cm
Answer:
<em>Good luck!</em>
Step-by-step explanation: