- Solve 3^x=21?

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How long can I store water? If the function f(x)=-x^4+2x^2-1 odd, even, or neither? Why? (25^x)/(125^-3x) = 625^2x-3 how do you solve for x? Which substance could you use to demonstrate "morphing" ? Are these substances fluids? For each explain your answer.? Suppose that A ⊆ B ⊆ V .
(a) Prove that span(A) ⊆ span(B).
(b) Prove that if B is linearly independent then A is linearly independent.?