- How can I solve 6x(to the second squared)−84x+240=0?

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Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion? How long does Equazen supplement really take to make effect in adults with inattentive adhd? Has someone tested it? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20?