it is minus 4 (-4) the right answer
4-5 equals = -1
If you mean (5*4)/5 then it equals 4
Nope. 2 + 2 = 4
-1
20
4
-4 +5 -5 + 4
1 times 4 = 4. 4+1= 5
5 x 4 equals 4 x 5 is commutative property.
50
Using Pythagoras: a² + 1² = (√5)² → a² + 1 = 5 → a² = 4 ↓ a = √4 = 2. The missing side is 2 units long.