Answer: 
Step-by-step explanation:
Given
Length of board is 
It is divided into 4 equal pieces i.e. length of each piece is

If
of an inch is removed from one of the pieces then,

Divide both numbers by 20
20/20 and 100/20= 1/5
So 1/5 is the answer
It's 9! or 9*8*7*6*5*4*3*2*1 which is equal to 362,880
Answer:6340000
Step-by-step explanation:
The answer is (x,y) = (3,-7)