- What infromation does the atomic mass of an element provide?

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1-)y'=y^2, y(t)=(c-t)^ -1 (-infinity,c)
2-)(3xy+y^2)+(x^2+xy)y'=0? Chemistry Help. Identify the substance that is an ion.
a. HClO4 b. CaBr2 c. Br- d. SO2? A piece of firewood is thrown straight up and it takes 3 seconds to reach the tip of its rise. What was the initial vertical velocity? A sphere's radius is increasing at 2m/s @ time 5s what is its surface area.? One can enclose a finite area with a curve of infinite perimeter?