Directions: Read and understand the problems below. Answer what is ask. Show your complete solutions.

1. A Cellular phone networks use towers to transmit calls to a circular area. On a grid of a province, the coordinates that correspond to the location of the towers and the radius each covers are as follows: Wise Tower is at (-5-3 ) and covers a 9 km radius; Global Tower is at (3,6) and covers 4 km radius; and Star Tower is at (12, -3) and covers a 6 km radius.
a. What equation represents the transmission boundaries of Wise tower?
b. Which tower transmits calls to phones located at (12,2)?
2. A radio signal can transnit messages up to a distance of 3 km. If the radio signal's origin is located at a point whose coordinates are (4,9), what is the equation of the circle that defines the boundary up to which the messages can be transmitted?

(i'll mark the answer with solutions as the brainliest answer)​