The answer is B. 5
6+2=8
3+5=8
P(a U b) = p(a) + p(b) - p(a ∩ b)
<=>
p(a ∩ b) = p(a) + p(b) - p(a U b)
I let you do the maths :)
Well i think you are suppose to explain how OR WHAT THE CHANGE IN DECREASE Is.
Hope i helped
The Total Surface Area Would Be A number
You can isolate r to one side of the equation by dividing by adding three, dividing by s, multiplying by a and you get:
r=a(3+k)/s