Please answer giving brainliest

12

Step-by-step explanation:

it is given that CD is tangent to O B

so BDC is right triangle.

pythagorean theorem

BD^2=BC^2+CD^2

13^2=5^2+CD^2

169-25=CD^2

CD=√144

CD=12

Copy and paste that for a correct answer

If the model is good, then both points will check in the equation. Substituting 8 for x and 5 for y in the equation results in 56 – 50 = 3, which is not true. Therefore, the model is not good. Using (–12, –9) as a check results in –84 + 90 = 3. The constant value in the equation should be 6, not 3. In slope-intercept form, the y-intercept should be –3/5.