Math help plz

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Find the domain and range of the following function f(x) = 51x - 21+ 4