Please help me I need someone smart

Does the point (1, sqrt 7) lie on circle shown.

Which table represents a linear function? i'll give brainliest to first answer ^'^

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?