<u><em>Explanation</em></u>
On Monday, the bank account balance was -$12.58
A. As you wrote a $30.72 check, so the new balance in your checking account will be: 
dollar
B. The bank charges a $25 fee for paying a check on a negative balance. So, the balance in your checking account after this fee 
dollar
C. For bringing your account balance back up to $0 after the fee, the money need to deposit ![=[0-(-6.86)]dollar =6.86](https://tex.z-dn.net/?f=%3D%5B0-%28-6.86%29%5Ddollar%20%3D6.86)
dollar.
Yes the domain represents the X vales and range represents the Y values
if c is -1 the equation should be
4x² + 4x -1 = 0
not plus 1
I assume you want the coordinates of the zeros.
if c is indeed -1, they are at (-1.207 , 0) and (0.207 , 0)
if c is +1, as in the equation the only zero point is at (-0.5 , 0)
see screenshot for illustration
Answer: - 8.89%
I am going to explain you in detail ir order to help you to be able to do this kind of problems by yourself.
The definition of percent change, %, is:
change
% = ---------------- * 100
base value
The base value is from where you start or the value for which you want to asses the variation.
So, in this case the base value is 90 (starting value).
The change is final value - initial value = 82 - 90 = - 8. The negative sign means that the value decreased.
So, following the formula you get:
82 - 90 - 8
% = ----------- * 100 = -------- * 100 = - 8.89
90 90
Answer: the percent of change is - 8.89 %, meaning that the value decreased 8.89%.
