Answer: 50,001²-49,999²=0,2.
Step-by-step explanation:

Answer:
- 
Step-by-step explanation:
Given

= 
=
, substitute values
= 
= 
= - 
Cos60° = 0.5
Any angle less than 90° is an acute angle.
Therefore, 60° is the acute angle.
-7(x+y=525)-7
3x+7y=2775
-7x-7y=-3675
3x+7y=2775
-4x=-900
X=-900/-4
X=225
Answer is c