50/80 = 0.625
100 - 0.625 = 0.375
0.375 = 37.5% (move the decimal point to the right 2 spaces)
37.5% decrease is your answer
hope this helps
You can check using the Pythagorean Theorem: a^2+b^2=c^
a=10
b=41
c=42 (because it is longest)
10^2+41^2=42^2
100+1681=1764
1781=1764
Since they are not equal, this is not a right triangle
Hope this helps<span />
Answer:

Step-by-step explanation:
If r varies directly with the square of m and inversely as s,
then
where k is some constant
Given r = 12 when m = 6 and s = 4:
⇒
⇒ 
⇒ k = 
Therefore, substituting the found value of k into the original equation: 
Find r when m = 4 and s = 10:

⇒ 
⇒ 
Answer:
Step-by-step explanation:
move constant to the right and change the sign
X=12-8
X=4
The answer would be 507355