June 1 2013 Math Thread

<p>@choo, it never said b couldn’t be 0 as well.
If you actually simplify you end up getting (a-b)^2 = 0 so pretty much a and b have to be the same, so a can be 0 if b is also 0.</p>

<p>I answered the more than 3 question on the first page at the bottom guys :)</p>

<p>Did y’all have a last math question on salads and dressings, or on inversely/directly proportional?</p>

<p>don’t worry, my math was experimental and I didn’t have it either.</p>

<p>@predoc, yes the answer to the salad and dressing was 80. i don’t remember was the proportion was, if you could refresh my memory on that one…</p>

<p>@choo12
question didnt say anything about a b are different #s.
so (0+0)/2=0 sqrt of 0 =0</p>

<p>salad question was 80.</p>

<p>@predoc yup, I got 54</p>

<p>@predoc I did! Well at least for the salad one, can’t really remember the other proportional one</p>

<p>@br1717 hmm I guess I just assumed since the two variables were different the numbers would have to be different ):</p>

<p>54 was the amount of people with that salad or dressing, but they asked you for the total number that wanted that salad. so you had to add 54 to the other stuff to get I think 80</p>

<p>Consolidated Answers so far
20 stacked cups was 48.
The last gridin question with the digits of n was 122
The one with the circle with two diameters was I. only
The last one on the 20 minute section with the triangles was 17
The one before it with the a + b/2 = square root of ab was options II. and III. I believe, a = 0 and a>0
The one with f g h and it asked you for a value of g(5) you could’ve put any integer between 25 and 28 or 29 I believe
The one with the volume of the sphere inside a cylinder was 2/3
The one with the vitamin c was 320
The one where you have an equation and it asks you for r of (r,s) when the graph intersects the y axis (answer is 0 because it’s the x coordinate when it intersects the y axis)
How many quadratic functions with same x intercepts: more than 3
Which age could not be possible: 65
Median number of puppies: 2
Chef question with salads: 80
what is y in terms of x: 3x
the one with the symbol and 360/1//2 = 720
the one with the charity was 5,000
the one where it it tells you y is within a certain range and x/y = y , 4 was one of the answers
triangle perimeter 14, smallest side = 3
The one with two triangles and it asks you for the sum of two sides of the bigger triangle: 16.5
shaded unshaded square/circles: 50
girl/train/clocks ahead: 26
max number of angles of three lines greater than 90 less than 180: 3</p>

<p>does anybody remember the question with the shaded/unshaded semicircles inside 4 squares and the question with the triangle with a perimeter of 14?</p>

<p>@aerophane
that was 50</p>

<p>^ it was 50. Thanks for reminding me
aero: the perimeter 14 one the answer was 3</p>

<p>The one with the time with the train and the girls clock is ahead: 26</p>

<p>I got 1/8 for the sphere/cylinder one…</p>

<p>Also are we sure it asked for the x value in that (r,s) question? I put the Y value -2… Hoping I didn’t misread that</p>

<p>The one before it with the a + b/2 = square root of ab was options II. and III. I believe, a = 0 and a>0</p>

<p>This one is a little confusing and I believe I got it wrong because I put X can be negative because</p>

<p>if a and b are both 5 </p>

<p>(-5±5)/2 = sqrt(-5*-5)</p>

<p>Is true, right? -5 is the root of 25?</p>

<p>I debated this for awhile and ended up putting that all three could be true I think.</p>

<p>PS all of my free response were:
55
3
5000
25
26
15
320
2/3 (Cylinder problem)
25 < x < 28
122</p>

<p>For the n repating numbers one (1001, 1002, 1003, 1004…1020) how were you supposed to solve it? I did this equation:</p>

<p>1+1+1+2+1+3+1+5+1+6+1+7…+1+20</p>

<p>What was the one with the digits going from like 1001 to 1020 or something</p>

<p>@ kaffy, -5 times -5 = 25, square root of 25 = 5, -5 + -5 = -10, divided by 2 = -5, 5 does not = -5</p>

<p>the 1001 1002 was 122, the sphere one was definitely two thirds.</p>

<p>cylinder: the radius is r, the height is 2r, by the volume formula you get 2<em>pi</em>r^3
sphere: the formula is given, 4/3<em>pi</em>r^3 </p>

<p>because of the similar elements on both of these, you can disregard the pi and r^3, thus the answer is 4/3/2 or 2/3</p>

<p>I had the one on salads and dressings. My answer was 80.</p>

<p>For the X+1 Y-1 problem I put 8/3, which was a guess. Can anyone confirm?</p>

<p>Consolidated Answers so far
20 stacked cups was 48.
The last gridin question with the digits of n was 122
The one with the circle with two diameters was I. only
The last one on the 20 minute section with the triangles was 17
The one before it with the a + b/2 = square root of ab was options II. and III. I believe, a = 0 and a>0
The one with f g h and it asked you for a value of g(5) you could’ve put any integer between 25 and 28 or 29 I believe
The one with the volume of the sphere inside a cylinder was 2/3
The one with the vitamin c was 320
The one where you have an equation and it asks you for r of (r,s) when the graph intersects the y axis (answer is 0 because it’s the x coordinate when it intersects the y axis)
How many quadratic functions with same x intercepts: more than 3
Which age could not be possible: 65
Median number of puppies: 2
Chef question with salads: 80
what is y in terms of x: 3x
the one with the symbol and 360/1//2 = 720
the one with the charity was 5,000
the one where it it tells you y is within a certain range and x/y = y , 4 was one of the answers
triangle perimeter 14, smallest side = 3
The one with two triangles and it asks you for the sum of two sides of the bigger triangle: 16.5
shaded unshaded square/circles: 50
girl/train/clocks ahead: 26
max number of angles of three lines greater than 90 less than 180: 3
Gridin where it asks for the value of an angle: 55
the question ax + ay = a^2, whats x + y =, answer = a
The question with z and x, where z = x +10 : answer = 0</p>

<p>idk about II and III, I put I, II, and III.</p>

<p>0+0/2 = sq(0)
1+1/2 = sq (1)
-1±1/2 = sq (1) because sq (1) is plus or minus 1</p>