- What is the x-intercept of -10x^3 + 8x^2 + 15? Could anyone explain?

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A circle has a circumference of 14 mm. What's it's area? Is there a website that solve Acid-Base question? For example: calculate pH, pOH, ka... and also titration.? Is there a pi service for online activities if so can they be hired? Could it be the universe revolves around the earth? Environmental effects from series and parallel circuits?