Pls help extra points and mark brainlist

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Which of the following can be used to explain a statement in a geometric proof?

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.