- I have an error 19. What is this?

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A diamond contains 6x10^21 atoms of carbon.What amount (moles) of carbon are in this diamond?What mass(grams) of carbon are in this diamond? Which equation has the same solutions as x2+6x-7=0? Convert the equation to polar form. (Use variables r and θ as needed.)
x^2 − y^2 = 12? The moon phobos orbits mars (mass= 6.42 x 10^23 kg) at a distance of 9.38 x 10^6 m. what is its period of orbit? Can someone describe the flow of blood through the heart and mention when the blood is oxygenated and deoxygenated?