- MgCO3=?predict equation and balance?

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The exact value of sin(cos^-1(3/5)) ?? please help? Any one answer this question number 22 on picture? How would i solve this physics problem (I'm getting it wrong over and over agin)? IN a triangle if lines are drawn parrallel to the base.The distance between each line is x.Then prove that their lenghts are in ap? What equation did Einstein use to show that the speed of light changes subject to the level of gravity?