Math question

Test Preparation SAT Preparation
1

<p>Hi guys, all these questions I need help with are in the Blue book 2nd edition.</p>

<p>Pg 370, #10
According to the table above, if k=f(3), what is the value of g(k)?</p>

<p>x f(x) g(x)
0 5 2
1 0 4
2 2 3
3 4 1
4 1 5
5 3 0</p>

<p>Answer is E, 5.</p>

<p>Well, because k=f(3), then that means f(3)=4 so i know that g(k)=g(4) but how do I get the answer 5?</p>

<p>Page 371 question 12 (there's a diagram so only those with the book can help me, sorry!)</p>

<p>Thanks!</p>

2

<p>k = f(3)
f(3) = 4 = k
g(k) = g(4) = 5</p>

3

<p>? I just don’t get how does g(4)=5…</p>

<p>Can you plz explain? </p>

<p>O and can sum1 help with page 371 question 12 in Blue book 2nd ed?</p>

4

<p>Hmm… </p>

<p>The way I did it, </p>

<p>k = f(3)</p>

<p>x = 3.
x -> f(x)
3 -> 4.</p>

<p>4 is now your ‘x’.
x -> g(x)
4 -> 5.</p>

<p>I hope that helped.</p>

5

<h1>12</h1>

<p>I drew a point in the center of the dartboard to represent the center of a circle. Since each ring is just as wide as the the last one, you can assume that the distance from the center to the end of the first ring is one. The distance from the center to the end of the second ring is two, and so on. It ask for the ratio of the area of the small shaded ring to the ring on the outside. Once you have them labeled, it’s a simple matter of comparing the distances. It turns out to be 2:4, or 1:2.</p>

6

<p>Well, i checked the answers and it says that 3:7 is the answer…I don’t understand it lol</p>

7

<p>Can’t you take a photo of that prob and post it here? :-/</p>

8

<p>To dwarfwarri
since you already know that k= f(3) = 4, it should be easy for u to figure it out. The key is that when evacuating g(k), k is simply the independant variable of the function, as equivalent to x,y or any other letter, not indicating any specific value. 'cuz you already get that k=4, just look for the value in the column of g(x) and the row of x=4. Then the number 5 will be seen.</p>

9

<p>try a way to solve the problem for u. f3=k=4, gk=gx=5. it doesn’t matter if it’s k or x, anything in( ) is the same,it all means x. hope it can help</p>

10

<p>S(big shade)=pie(4^2-3^2)=7pie,
S(small shade)=pie(2^2-1^2)=3pie,
thus,the radio is 3:7</p>

11

<p>Thanks iLEE!! You helped me alot! </p>

<p>Thanks a TON for everyone who took your time to help me! </p>

<p>Thanks!!!</p>