- 30x2 - 23x + 3?

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Is there really a neutron star heading towards earth in the year 2080 or 2087 please answer? A metal cube 8cm^3 has a density of 6600 kg/m^3 find its mass when it is totally submerged in water? How do I use function notation to write g in terms of f? g(x)=√(7-x) +2? Can some one help me find General biology course ( exams ) ? A position given by:
r = [2.0m+(5.0m/s)t] i + [3.0-(1.0m/s^2)t^2] j,
What is the magnititude of the acceleration of the object at time t=2s?