Discover Questions

Find the equation of directrices of ellipse 9x²+4y²=36. Isn't it y=+/-9/2? Adjacent =10
Opposite =1,000
Whats the tan? Any text book out there I can use to improve my maths?? I am currently in Year 10.? What is the probability that a randomly chosen person has his or her birthday: a. in July b. in January or February? We used to measure temperature in degrees centigrade. Now we call it celcius, why the change?