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A cement pipe has an outside diameter of 11 1/4 in. and a wall thickness of 1 1/8 in. What is the inside diameter of the pipe?
The radioactive bismuth isotope (210 Bi) disintegrates, according to q=k(2)^(-t/5) where k is constant and t is the time in days. Express t in terms of Q and k.
Evaluate if r=1/2 (r-3)(r)(r+3) ------------- (r-2)(r+2)
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