- What is the formula to calculate standard deviation?

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What is the answer for (3x+5)3 using the formula x3+3x3y+3xy2+y3? Need to find the solutions to |2(x-1)| + y = 1 and x + 2|y-1| = 8 ? What is the element zinc, and what is the element gold too? What would happen if a stable isotope of plutonium was discovered? What is the smallest of the 3 types of radiation?