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Resenda Lopez tags or pictures? Find a. the number of lines of symmetry of the diagram, b. the order of rotational symmetry of the diagram.? How was the cov( X(s), X(t)) obtained. i know that E[x(s)] * E[x(t)] = 0 but i don't know how to calculate E[x(s) x(t)]? Given that x is a normal variable with mean μ = 49 and standard deviation σ = 7.1, find the following probabilities. P(x ≤ 60)? If i found 35 quarters and dimes worth $6.50 how many of each do I have?