<p>After getting my ass kicked by barrons, i tried getting some problems off the CB site. I could answer all 21 questions correctly except 3. </p>
<p>Number
26<<Need help on tangency, ect
28
33 <<I need help on matrices, why the answer is correct
34</p>
<p>Thanks so much! I really appreciate any help.</p>
<p>Hey jcll2002, I don't know what you mean by 21 as there are 17 questions for the math level 2. But anyway, to answer your questions...</p>
<p>26.) This problem is actually insanely simple if you just look at it long enough. Imagine that there is a line that bisects the 50 degree angle and you have two right triangles and can find the other angle which ends up to be 65 degrees. Then you can just double it to find the angle of ARB, r being the radius. After that, you can use the law of cosines to find AB. do you get it? Ask me again to clarity anything that might have been ambigious in the explanation</p>
<p>28) This problem is just a matter of getting you inputs and outputs right. Remember, that an input on an inverse is the output of the original, so you have to plug in 1.5 for f(x), not x.</p>
<p>33) This problem is not about matrices, maybe the next one (your arrow is wrong). but for this problem, a graphing calculator can be extremely helpful. you first need to realize that there are 40 days betwen march 21 and may 1. then you just plug it into the equation and get a value 13.14 I think. That you graph the equation and find the maximum which occurs at whatever, but does not matter because it give you the y value, which the hours of sunlight already. And 14-13.14= approximated .8 which is the answer. alternatively, you could you calculus by taking the derivative of the function and setting it equal to zero, but that takes too long. Graph is much simpler and easier. :)</p>
<p>34) So you know that the only two resulting matrices that could even be possbile are b and c right? Well, after you realize that, you need to see what the problem is asking you for. it's asking you for the dollars recieved on each day. In that case it would be c. If it were to ask total price of camera sold for each model it would be b. Hope that makes any sense. Could you help me on 21 and 24? I don't know what I 'm doing wrong.</p>
<p>thanks for the explanations. im going to try to ATTEMPT to help you, but as you know its really hard to write out.</p>
<p>21). I couldn't figure this out at first so I resorted to drawing out the points and connecting them into a parallelogram. You know you are looking for the measure of the biggest angle so what I did was I made a right triangle on the bottom left corner to find the angle (which is the smaller angle in the parallelogram. Used tangent to find the angle). I then multiplied this angle by two (to get the sum of the two smallest angles) and subtracted that from 360 to get the sum of the larger two angles. You then divide that by two and that's the answer.</p>
<p>24.) this one is simple with a calculator, but doing it out will probably also work but its a massive waste of time. What I did was I took the inverse sin of .57 and got an answer (in radians). I then did the sin of pi - that angle and got the answer. It's just two steps on the calculator.</p>
<p>Please let me know if you need a better explanation because i know what i wrote was hard to follow.</p>
<p>I feel like an idiot. I still don't understand 28. To find the inverse eq. I switch the X and the Y but yeah, im still lost. </p>
<p>Thanks again.</p>
<p>Don't be too hard on yourself for not getting 28, it's probably a computation error. So, when you plug in 1.5 for f(x), you get 1.5=(x^3+1)^(1/3). Then you want to cube the whole thing so you get 3.375=x^3+1. Then you subract 1 and you get 2.375=x^3. You then just solve for x: (2.375)^(1/3) and it yields the solution, 1.3342, which is close enough to the credited answer of 1.3</p>
<p>This may be a stupid question, but when do you use radians or degress when calculatings trig angles? (I need to brush up on some of my basics)</p>
<p>you can use either one, but since there was a pi in question 24, use radians.</p>
<p>Thanks again.</p>
<p>hi! I am currently doing the same problems and can't get 22, 27, and 31. Any help?</p>
<p>Hey WantIvy:
22. For this problem you need to know what the terms are being added by, thus you set up an equation that should something like this: (5t-1)-2t=(6t+2)-(5t-1). Then, once you know what t is, you can figure out the pattern of the sequence.</p>
<ol>
<li><p>If x-2 is a factor, that means that 2 is a zero. thus you just need to plug in 2 for the expression and set it equal to zero; then find k.</p></li>
<li><p>For this one, I kinda used calculus. If you take the derivative of y and x with respect to t, then you just set dy/dt/dx/dt which yields dy/dx which is the slope. Otherwise, you have to get rid of the t so that your in cartesian form.</p></li>
</ol>
<p>Sorry if the explanations are unclear and short for an explanation. I'm taking the test too you know and I have to study as well. :)</p>
<p>Nano:<br>
I don't even know why I would ask the first two questions :S very, very dumb moment for me, I guess. Anyway, interesting approach for 31. I guess it works, but wouldn't that mean finding the slope of the tangent line? As opposed to finding the slope of that line? Hmm.</p>
<p>I'm not sure that I quite follow what you're trying to say for 31. Could you clarify?</p>
<p>20 anyone?</p>
<p>one 33, i tried to plug the equation in my calculator but it produces a straight line...</p>
<p>I still don't get ...26..</p>
<p>Help??</p>
<p>Oh wow...nevermind.</p>