<p>zlz, for the cos one, if you multiply 1/9 by 2 and then subtract one you get -7/9??</p>
<p>From what I remember for cos2x, it gave you:</p>
<p>cosx^2 = (1 + cos2x)/2</p>
<p>You were also given cosx = -1/3.</p>
<p>Square it and you have the left side of the equation.</p>
<p>1/9 =(1 + cos2x)/2 -> Multiply both sides by 2.
2/9 = 1 + cos2x -> Subtract 1 from both sides.
-7/9 = cos2x //// and there’s your answer :D</p>
<p>yeah, I agree with SLightManifesto. I did it on my calc right now and I got -7/9</p>
<p>@lovelytexan…no idea what question number haha…sorry</p>
<p>@james - you were solving for cos2x so you had to isolate it since they gave you a formula set equal to cosx^2</p>
<p>Just checked my answers on the calc, also got -7/9</p>
<p>why is there such a huge range of dates for when we can possibly get our scores? do the majority of the people get their scores on 4/26?</p>
<p>When I took mine in december I got my scores by 12 AM on the first date</p>
<p>What is the range of dates they give</p>
<p>what about the book ones? like: how may does she need to read in the next 5 days per average to finish the book??? was it like 1/8th??? im not sure if that was the answer choice though? any 1 remember</p>
<p>Ohh damn I think I forgot to awnser that question uhhhhhhh</p>
<p>3/20
(1 - 3/12)/5</p>
<p>"central angle in shaded sector of circle was 45 degrees "</p>
<p>Can anyone explain/provide more detail? I dont remember it.</p>
<p>The arc of the non-shaded was 7pi so that means that the rest of it was pi
Then I used that and the radius (can’t remember what it was) to find the angle I think?</p>
<p>Wait just remembered I awnsered that questio thebfirst 3 days she read 1/12 so after 3 dAys she reAd 1/4 so that’s equal to 5/20 so she had to read 15/20 in the remaining 5 days resulting in 3/20 per day</p>
<p>@eagles: that one was 3/20.</p>
<p>Oh, I did 1/8 of 360 (a circle) and that’s 45</p>
<p>Angle is 45 because 360/8 (remember there were 8parts to the whole circle than) 1/8 of 360 is 45</p>
<p>Was the cos2x = -7/9 answer choice A then? or was it B, I thought B was like -7/8?</p>
<p>oh ok I remember that now</p>
<p>thanks</p>
<p>can anyone confirm 10cos75?</p>