My last SAT questions before exam :D

Test Preparation SAT Preparation
1

<p>Hi guys I was solving real SAT exams and I always get 3 wrong !!!!! </p>

<p>Anyway here are my questions.</p>

<p>18)If 0 <= x <= y and (x + y)^2 - (x - y)^2 >= 25,what is the least possible value of y?</p>

<p>I tried to solve it like this --></p>

<p>x^2 + 2xy + y^2 - x^2 -2xy + y^2 >= 25;</p>

<p>4xy >= 25;
xy >= 25/4 </p>

<p>But then I couldn't solve more why ? because there many values smaller for y since he never said integers !!! </p>

<p>Answer is 5/2 or 2.5.</p>

<p>9)The interior dimensions of a rectangular fish tank are 4 feet long,3 feet wide,2 feet high. THe water level in the tank is 1 foot high. All of the water in this tank is poured into an empty second tank. If the interior dimensions of the second tank are 3 feet long,2 feet wide, 4 feet high, what is the height of the water in the second tank??</p>

<p>1)0.5 FT
2)1 FT
3)1.5 FT
4)2 FT
5)4 FT</p>

<p>Answer is D.</p>

<p>You need image for this one and I uploaded it on imageshack.
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<p>16)In the figure above AC = 6 and BC = 3. Point P (not shown) lies on AB between A and B such that CP is perpendicular to AB. Which of the following could be the length of CP?
1)2
2)4
3)5
4)7
5)8</p>

<p>Answer is A.</p>

<p>This question is from other test I had yesterday but I forgot to ask for explanation how to solve it.</p>

<p>You need image and here its one I did on mspaint.</p>

<p>ImageShack&#174</a>; - Online Photo and Video Hosting</p>

<p>5)In the figure above,square RSTU is inscribed in the circle. What is the degree measure of arc ST??</p>

<p>1)45
2)60
3)90
4)120
5)180</p>

<p>Its 60 I don't understand how can you solve this one ?? Your not given any information about circle or square!?</p>

2

<p>For #4, if you draw a line directly down from Point B, the intersection at AC will be Point P. You have now created a right triangle with a hypotenuse BC = 3. Since the hypotenuse is the largest side of a right triangle, the answer has to be smaller. So the answer is Choice 1 (2).</p>

<p>For #5, Since each arc is proportional to the equal sides of the square, you know that each arc segment is equal. So arc ST = 25% of the circle. A circle has 360 degrees, so (360)(.25) = 90.</p>

<p>The answer is 90, not 60.</p>

3

<p>18)If 0 <= x <= y and (x + y)^2 - (x - y)^2 >= 25,what is the least possible value of y?</p>

<p>(x+y)²-(x-y)² ≥ 25
[(x+y)+(x-y)]*[(x+y)-(x-y)] ≥ 25
(2x) * (2x) ≥ 25
4x² ≥ 25
x² ≥ 25/4
x ≥ 5/2
and your equation of xy≥ 25/4</p>

<p>We know x=y therefore y=5/2… I think there might be an easier solution… haha</p>

4

<p>

</p>

<p>Volume of water in the first tank : 4ft<em>3ft</em>1ft = 12 cubic ft</p>

<p>Volume of water in the first tank must equal the volume of water in the second tank.</p>

<p>12 cubic ft = 3* 2* x</p>

<p>12/6 = x = 2</p>

5

<p>I think leonz132 explained the other two concisely…</p>

6

<p>Thanks alot guys for answers</p>

<p>@leonz132 though the answer is B its not C I have answered C too but I was shocked to find the answer is B. Maybe they did write this question answer wrong ?? This is test released by collegeboard btw.</p>

<p>See here is the scanned answer sheet
[Imageshack</a> - img0001vi.jpg](<a href=“ImageShack - Best place for all of your image hosting and image sharing needs”>ImageShack - Best place for all of your image hosting and image sharing needs)</p>

7

<p>Answer to 5 has to be 90. Double check to make sure you didn’t make a mistake typing the question.</p>

8

<p>^Edit your correct its my mistake I mistook the answer of answer question.</p>

9

<p>Never mind question 5 I mistook the question number lol must have been solving alot of exam that I am starting to lose focus :smiley: .</p>

10

<p>I have the same QAS and the answer key is correct.</p>

11

<p>It’s number 8 in the 20 question section.</p>

12

<p>@JefferyJung yeh your correct it is number 8 my mind kinda mixed number 5 with number 8 when solving it I corrected as number 5. Don’t know why my mind did that must be lagging or something :D.</p>