Answer:
y = -2x +4
Step-by-step explanation:
The equation of a line is written as y = mx+b. Since m= -2 and b = 4, the the equation is y = -2x + 4.
The answer is i beleve 75+15n
1. Perfect square trinomials, are 2nd degree polynomials, of the form

so that

, which can be written as perfect squares.
2. For example

3. Thus

are perfect square trinomials.
4.

5. In the first case -b=20, so b=-20. In the second case, -b=-20, so b=20.
6. b∈{-20, 20}
Percentage decrease = d
h1 = 2950
h2 = 2550
d/100 = (h2-h1)/h1
d/100 = (2950-2550)/2950
d=13.56