- Why do metals corrode faster in tropical countries,than in temperate countries?.?

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Find values of x for which 4x^4+12x^3-19x^2+8x-1>=0
2.solve z-x-y=6 x^2+y^2+z^2=14 z^3-x^3-y^3=36 for values of x,y,z(unique soln)? How to convert 1 cm^3 to um^3 . My answer is 1x 10^12 .? Factor that enchance or impede information ib each of the step of the process? What is the derivative of sin^3(4t)? For the function f(x)= 20 - 4x / 3, find the value of k such that f(2k) = -k thanks!?