- I want to know how many inches are in a foot ?

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Why do you have to cover the plants with plastic bags or place them in a moist chamber after inoculation? My encyclopedia says that the Moon is 1/4 the size of Earth and that 80 Moons weigh the same 1 Earth, is this correct? Calculating thickness of ice? Pleading for help with solving complicated equation? Consider 2 RVs X and Y both of zero mean. Suppose E[XY]=4, var(X)=9 and var(Y)=16. What is the correlation coefficient?