Evaluate using suitable identity:
d). 9.9²

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.