Answer:

Step-by-step explanation:
Given



Required
Determine CD
Since, C is a point on BD, the relationship between the given parameters is;

Substitute the values of BD, BC and CD

Collect Like Terms


Divide both sides by -4


To determine the length of CD;
Substitute 3 for x in 
Hence;

Answer:
standard form for a quadratic expression
Step-by-step explanation:
This is a quadratic expression. If you want this expression in standard form, write the terms in descending order of powers of x: -2x^2 + 1.
This -2x^2 + 1 has not yet been factored.
-2x^2 + 1 is in standard form.
Answer:
-8.0625
Step-by-step explanation:
Let the number of coats Michael has = x
As given, Minnie gathers 3 times as many coats as Michael
So, Minnie has = 3x
Total number of coats = 52
Equation becomes,



Hence, Michael contributed 13 coats.