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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 a double displacement reaction use in our everyday life? What is the wavelength (in mm) of 5 million Hz ultrasound as it travels through human tissue? How can I get A's on my geometry tests? Please helpp?!?!?!?!?!? 9 kg of water at 16°C is placed in a refrigerator kept at 2°C. How much heat is transferred from the water to cool it to 2°C?