What is a Gantt Chart used for in project management?

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$2.$ ?What are the $3$ ?main relationships between sequential $($ one following another $)$ ?tasks? $)$

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$3.$ ?What task relationship term describes # $1$ ?in the chart below? $($ Must use the actual term $).)$

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$4.$ ?What relationship, if any, exists between Rough Framing and Structural Repair

$($ HINT: look for connecting arrows $)$