Can some one tell me how to solve any of these precal equations?

Can some one tell me how to solve any of these precal equations?
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answer:1. Find the value of the side of a square whose diagonal is known as ‘a’. ([a times (square root of 2)]/2) think about the square as 2 triangles, the diagonal is the hypotenuse. a^2+b^2[equal]c^2, and since a[equal]b, since its a square, 2a^2[equal]c^2. take the square root of both sides, a*sqrt(2), which equals a+b. since they’re equal, you divide it in two, thuse the (a*sqrt(2))/2) 2. evaluate: sin of pi/6 (1/2) unit circle, the x is cos, y is sin 3. A population has P(t)[equal]155063e^(0.14t) individuals, how man days (t) are necessary for the population to reach 1,000,000? (13.3137) its a problem of continuous interest. e[equal] 2.71828182, set the equation equal to 1,000,000, and solve using the natural log. 4. distance of a car is represented by s[equal]t^2+2t Find the average velocity from t[equal]1 to t[equal]5. (12ft/sec) this one i’ll have to get back to you on. what does everything stand for; does s [equal] distance and t [equal] velocity, or does t [equal] time?
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