- Is it strange how aliens are much smarter than Earth doctors and other intellectuals..?

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Calculate the energy in joules of a photon of green light having a wavelenght of 550 nm? Am i gregnant? Help! what are the values that will make this undefined: (x+4)/(x2+2x-15). Answers: A. x= 3 or -5 B. -3 or 5 C. 3 or 5 D. -3 or -5? Please help with hard precalculus? If f(x) is differentiable for all of x find the value of a and b : f(x)=cos (x) if x<0 =ax+b If x>or equal to zero?