The circular opening of tunnel has a circumference of 25 meters which equation can be used to find d, the diameter of the tunnel opening in meters

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To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Meee i honestly dont know what this question talking about

Plz , will award brainliest find an equation for the line that goes through the points (5,-8) and (13,4)