PLEASE HELP ITS A TEST :( Mr. Harrow has nine boys and five girls in his Honors Precalculus class. If he randomly chooses two students, one at a time without replacement, what is the probability that they are both boys?

What is the equation of the graph below? y=sec(x)-4

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.