The equality used is Subtraction property of equality
Option A is correct
Step-by-step explanation:
We need to identify which option best explains or justifies Step 1.
Step 1 is: 
The given equation is: 
To get the equation for step 1 we need to subtract c on both sides of equation i.e using subtraction property of equality


So, The equality used is Subtraction property of equality
Option A is correct.
Keywords: Solving Quadratic Equations
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Answer:
Step-by-step explanation:
I=PRT where I =interest P=principal, R=rate, and T =time is
Yes it is greater than 1/2
Answer - to solve for the equivalent equation of r you would need to use the formula r=c/pi2.