Why won’t let me comment on anything though I have never commented before

So me with this math problem. find the value of x the table shows the masses of 50 eggs. mass: 40-44 eggs: 6 mass: 45-49 eggs: x mass: 50-54 eggs: 12 mass: 55-59 eggs: 10 mass: 60-64 eggs: 7 mass: 65-69 eggs: 2 you!

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

What is not true about kl and mn? what is mn? (show )