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Oh, dude, "s.f." in math stands for significant figures. It's basically the number of digits that carry meaning in a measurement. So, like, if you're measuring something and you're like, "Oh, this is 5.23 meters," the "5," "2," and "3" are the significant figures. It's just a fancy way of saying, "These are the important numbers, pay attention to them."
This means it depends on if he is busy or not. Or it could mean it depends on if someone else ask him out, then he could choose between you two. It sounds as if he is not as excited about going out with you as you are with him.
The word converging is a verb that means the occurrence of two or more things (or people) coming together. Another way to phrase it would be, two things get closer and meet.
2x2 - 5x - 3 = 0 A quadratic equation expressed in the form ax2 + bx + c = 0 has two real and distinct roots when b2 - 4ac is positive. Using the figures from the supplied equation then b2 - 4ac = 52 - (4 x 2 x -3) = 25 + 24 = 49. Therefore there are TWO real and distinct roots.