Ydecreased by 23 is 52.9a. 52.9-23=y; y=29.9b. y-52.9=23; y=75.9c. y-23=52.9; y=75.9d. 52.9-y=23; y=29.9

C. y -23 = 52.9; y = 75.9

Step-by-step explanation:

y decreased by 23 is 52.9     Convert to a mathematical equation

y – 23 = 52.9                           Add 23 to each side

      y = 75.9

Check:

75.9 – 23 = 52.9

        52.9 = 52.9

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)