Functions is (-3,4)(2,4)(1,6)(5,7) is this a function

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse. a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?