- Circuits Problem!!! Plz Help!!!?

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I need help with this math problem Asap? What countries took part in brazil International Mathematical Olympiad? In formally proving that lim x->1 (1/9x-1)=-8/9, let ε>0 be arbitrary. Determine δ as a function of ε. please write epsilon for ε for answer? Why does extreme heat make the air look blurry? How do you factor completely? 25x^2-81 and 4x^2-7x+2?