- Single replacement: H2O(l)+F2(g)?

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What is a single displacement reaction used in our lives? Determine if function is one to one:
cubed root of x? Polar integral.....evaluate double intigral sqrt (x^2+y^2) da where d is the region bounded by cardioid r=1+cos (theta)......need help!!!!? What is the wavelength (in mm) of 5 million Hz ultrasound as it travels through human tissue? Rolls of foil are 304 mm wide and 0.012 mm thick. density of foil is 2.7 g/cm3
What maximum length of foil can be made from 1.21 kg of foil?