- Factorise e^2-100?

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Whats the answer to 3/2(8x+10)-3/5(10x-5)=0? From a deck of 52 cards how many different ways can three threes and two other cards occur? You want to make 2L of solution containing 100ppm nitrate-N. How much Ca(NO3)2 should be weighed into a 2L volumetric flask? ABCD is quadrilateral which its area is 123. Points E and F are on AD and BC respectively. If AE:ED = CF : FB = 1: 2 Find the area BEDF? Shouldn't the speed of light actualy be 6x10 ^8 since we can only measure 3x10^8 as the average speed of light in space?