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It is best to save yourself until after marriage and by doing so you will not be going against your conscience. Search the scriptures and pray for guidance that the Lord may show you what is right. As some people have pointed out that it will be alright because we are under grace now and are...

ahhhh... now i see what i was doing wrong. After putting in the values for the definite integral it worked out nicely. :P Thanks to everyone who helped me understand the question and also taught me how to substitute with trig functions. hehe Something i better learn sometime.

Ok, normally with substitution when x is replaced with u, dx has to be changed to du but I'm not quite sure how to do this with this particular equation. After using _ShiFTy_'s idea the equation now looks like this: (4-4(sin^2)u)^0.5

I see. I've never done substitution using trig, only substitution involving u=(whatever you want).

How do I integrate (4-x^2)^0.5 or is there a formula that I can use?

Nine points lie on a plane. Five of these lie on a line l. No other set of three of these points in collinear. i) How many sets of 3 points can be chosen from the 5 points lying on l. ii) How many different triangles can be formed using the 9 points as vertices? Can someone please help me...

That does make it a lot easier. Thanks for the help.

I see. So do I just put the numbers in the correct places in the formula and leave it like that?

Sorry. Most of the questions I have seen this form required are for the Probability and Permutation questions.

If a question says leave the answer in unsimplified form, what does it mean because I don't know what this form is?

This is so true :P Although I must admit 4U is pretty crazy. I much prefer 3U as it is less complicated.