Which is the equation of a parabola with a directrix at y = -3 and a focus at (5, 3)?

a. y=1/12(x-5)²
b. y=-1/12(x-5)²
c. y=1/12(x+5)²
d. y=-1/12(x+5)²

What effect does nuclear radiation have on atoms?

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal