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• October 15th, 2017, 22:29
MarkFL replied to a thread Show AB = BC in Pre-Calculus
It tells you the three points are collinear...now, is point $B$ the midpoint of $\overline{AC}$ ?
9 replies | 92 view(s)
• October 15th, 2017, 22:00
MarkFL replied to a thread Show AB = BC in Pre-Calculus
Please attach the images inline...otherwise they won't show up in the "Topic Review" and having them show up there can be helpful when replying to a...
9 replies | 92 view(s)
• October 15th, 2017, 21:51
MarkFL replied to a thread Show AB = BC in Pre-Calculus
In order for three points to be collinear, we can pick any two distinct sets of two points from the set of three to form two line segments, and those...
9 replies | 92 view(s)
• October 15th, 2017, 16:11
Hello, MHB Community! (Wave) Those of you active in this forum have likely noticed some new thread prefixes associated with a few of the threads...
2 replies | 1870 view(s)
• October 15th, 2017, 00:20
Unsolved Challenge
Prove √(sinx)>sin√(x) in Challenge Questions and Puzzles
Prove that $\sqrt{\sin x}>\sin \sqrt{x}$ for $0<x<\dfrac{\pi}{2}$.
0 replies | 54 view(s)
• October 14th, 2017, 22:40
Unsolved Challenge
Evaluate ∠APR in Challenge Questions and Puzzles
Hi Opalg! I can't tell you enough how much I appreciate your participation to the two unsolved challenges of mine...and you definitely are on a...
3 replies | 113 view(s)
• October 14th, 2017, 19:42
MarkFL replied to a thread Isosceles Triangle in Pre-Calculus
Yes, the distance formula would be a good way to proceed, but recall, an equilateral triangle is a special case of an isosceles triangle...so, you...
2 replies | 48 view(s)
• October 14th, 2017, 19:39
MarkFL replied to a thread Show AB + BC = AC in Pre-Calculus
Yes, and if this is true, then what must be true of the 3 points?
2 replies | 45 view(s)
• October 14th, 2017, 19:36
When doing synthetic division, the actual root $r$ or zero of the polynomial is put out to the left. Thus we know: f(r)=0 And the polynomial...
1 replies | 43 view(s)
• October 14th, 2017, 19:26
I am assuming the volume is the cubic polynomial: V(x)=2x^3+9x^2+4x-15 We are told the depth is $x-1$, so we know $1$ is a zero of the...
1 replies | 40 view(s)
• October 14th, 2017, 19:18
MarkFL replied to a thread Show AB = BC in Pre-Calculus
Yes, the distance formula would work, or if you can show the 3 points are collinear, then you could use the mid-point formula. :)
9 replies | 92 view(s)
• October 14th, 2017, 19:14
When I plug in the numbers, I get choice C). W|A - 40000(0.11/12)/(1-(1+0.11/12)^(-30*12))
2 replies | 58 view(s)
• October 14th, 2017, 12:24
Unsolved Challenge
Prove ∠A≤60°. in Challenge Questions and Puzzles
I can only say thank you, Opalg, for your so insightful and intelligent solution! (Sun)(Cool)
2 replies | 116 view(s)
• October 14th, 2017, 02:19
Unsolved Challenge
Evaluate ∠APR in Challenge Questions and Puzzles
Let $A$ be the midpoint of the side $QR$ on a triangle $PQR$. Given that $\angle APQ=3\angle APR$ and $\angle PAQ=45^\circ$, evaluate $\angle APR$.
3 replies | 113 view(s)
• October 13th, 2017, 12:28
Unsolved Challenge
Prove ∠A≤60°. in Challenge Questions and Puzzles
Hello MHB, This is the first of our "Unsolved challenge" threads, it is a challenge which I found pretty interesting but yet I still couldn't...
2 replies | 116 view(s)
• October 13th, 2017, 12:14
Here is this week's POTW: ----- Consider the sequence $\{a_k\}_{k\ge 1}$ is defined by $a_1=1$, $a_2=\dfrac{1}{2}$ and...
0 replies | 57 view(s)
• October 13th, 2017, 12:05
Congratulations to the following members for their correct solution: 1. MarkFL 2. lfdahl Solution from MarkFL: By cyclic symmetry, we know...
1 replies | 100 view(s)
• October 13th, 2017, 02:54
Let's let $D$ be the amount of the end of year deposits, and $i$ be the annual interest rate. So, the amount of the account at the end of year $n$...
2 replies | 46 view(s)
• October 12th, 2017, 09:29
MarkFL replied to a thread New here in Introductions
Hello and welcome to MHB, Johny! (Wave)
3 replies | 157 view(s)
• October 11th, 2017, 21:38
Okay, judging by your derivative, we are actually given: p(t)=10te^{-\frac{t}{8}} And so: p'(t)=-\frac{5}{4}e^{-\frac{t}{8}}(t-8) Do you...
2 replies | 53 view(s)
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We are happy to see that you have returned, and we look forward to your continued participation here!

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anemone.
3. Hello and welcome back to MHB, paulmdrdo!

We are happy to see that you have returned, and we look forward to your continued participation here!

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4. Hello paulmdrdo,

We ask (as per forum rule #16) that math questions be posted in the appropriate sub-forum. I recommend posting this in the pre-calculus forum. This way, all members have a chance to read your problem and offer help, and it contributes to the knowledge base of our site.

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I am so pleased you accepted my invitation to join!

If you have any questions or comments about the forums, please feel free to address them to me or another staff member. We are happy to help, and look forward to your participation here!

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