Answer:
z=-25.4
Step-by-step explanation:
Add 11.5 to both sides of the equation, then simplify. Multiply all terms by the same value to eliminate fraction denominators
17.09 has 2 decimal places, so we put the decimal digits of 17.09, 09, over 1 followed by the number of zeroes equal to the number of decimal places, 2: 09 = 09/100. We add 17 as 1700/100 and get: 17.09 as decimal fraction = 1709/100

that's the equation for a circle
plug in the given h,k and r values then