A construction company has a job to knock down the old mall. They have a crane to help them do this. The mall roof is given by the

equation .5x + y + 5z = 1. The crane is located at the point (0, 0, 0).

What is the distance between the roof and the crane?

Basically I have no idea how to start this, my teacher barely mentioned projections, though from googling that is all I can find on how to work out this problem. Anyone who could provide me with a couple of beginning steps would be greatly appreciated.

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