- What is the probability of a baby being born a boy is 50 -50?

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Is antigravity a substance that exist now only in sci-fi novels? Will chemists one day in year million (far future) invent it eventually? How can I learn calculus on my own? An equation of motion is given by x=at^2+bt+c where a,b,c are unknown variables. If x=position and t= time, what are dimensions of a,b,c? ? How many grams of fluorine gas occupy 543.2 mL and exert 123456 Pa of pressure at 29.8 degrees Celsius? Give answer to 3 s.f.? How much longer would it take to mow an acre with a mower that has a 4 ft wide deck vs. one w/ a 6 ft wide deck (if moving at same speed)?