- Purpose of determining specific gravity?

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What is the acceleration of a proton moving with speed of 7.5m/s at right angle to a magnetic field of 1.4T? If f(x)=x^2-1 and h(x)=4x+3, then f(h(2))=? Why is the answer "No Sum," for #14? (look at the attached picture)? The square base has sides of length 8 inches and the slant height is 6 inches. what is the surface area of the block.? Can blood typing be performed using only the serum portion of the blood?