The answer is -4. I solved it on a calculator and got -4
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The correct sign for the two given digits compared is greater than. 2.75 is greater than 2.6.
Yes, most likely. You may also find it helpful to plug the pi symbol along with your answer into your (scientific) calculator as it will give you a more accurate response.
Option A is correct as if we solve the equation We will find that the above equation can be compared to the standard quadratic equation i.e ax^2+bx+c=0