What is the difference between delta x and dx?

Δx (delta x) is about a secant line, a line between two points representing the rate of change between those two points. That's a "differential" (between the two points).

dx is about a tangent line to one point, representing an instantaneous rate of change. That makes it a "derivative."

the answer is 96 degrees

step-by-step explanation:

you have to realize that a line equals 180 degrees

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