- Why is precalculus so useless?

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Is it true that a stream velocity moving 75 cm/s can transport pebbles, sand,silt, and clay? Sn=192,a1=2,d=2 find n=? The quantum atomic model and Bohr's atomic model both have -
Rings
a wave
proton
orbitals? Vichka196@yahho.com? Find g(x), where g(x) is the translation 8 units left and 18 units down of f(x)=x. In terms of mx+b, with m and b being integers.?