20-30 and 40-50 have ranges of 1.
30^2=900
55^2=3025
900+3025=3925
Square root of 3925==64.6298
This is Pythagoras Theorem where A^2+B^2=C^2 square root of C is answer hope this helped, the answer is 64.63
1. (3,-2)
2. (-2,2)
3. (1/3,2/3)
4. (13/7, 40/7)
I believe the answer is:
2b x (b-3) x (b+3)