45
180-135=45
..........................
Answer:
a) 11.9% increase
b) 35% increase
c) 5% decreases (or -5%)
Step-by-step explanation:
a) change: 235 - 210 = 25
% change:
25/210 × 100 = 11.9047619%
b) change: 13.5 - 10 = 3.5
% change:
3.5/10 × 100
35%
c) change: 75.9 - 79.9 = -4
% change:
4/79.9 × 100 = 5.00625782×%
Length of wooden flooring strip = 
or 
Length of strip cut off = 
or 
So, the new length of the strip will be=
=
Hence, the new length of the flooring strip will be 
inches and in mixed fraction it will be 
inches.
The largest area that can be enclosed will be that of a square (140 ft)/4 = 35 ft on a side. Such a square has an area of (35 ft)² = 1225 ft², not enough for the garden to be 1300 ft². This tells us the solution to the equation you're being asked to write is non-real.
_____
Putting the given numbers in the area equation, you have
... 1300 = 70w -w²
Multiplying by -1 and completing the square, we have
... w² -70w +35² = -1300 +35²
... (w -35)² = 1225 -1300 = -75
Taking the square root shows us the solution is non-real.
... w - 35 = ±√(-75) = ±5i√3
... w = 35 ± 5i√3 . . . . . . . . . after adding 35. These are complex solutions.
