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by FWT
Thu Aug 06, 2015 3:51 pm
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 212

Re: making cubes

Added information: If a cube can be obtained by rotating another cube, these two cubes are NOT considered to be different. So the other reply was right about what to assume. Thanks for that. My 27 is wrong. How do you know? What was your reasoning? My reasoning would start by doing one half (or &qu...
by FWT
Sun Jul 05, 2015 5:10 pm
Forum: Trigonometry
Topic: Trigonometry functions help
Replies: 1
Views: 114

Re: Trigonometry functions help

Hey guys... i need help with the following functions.. Do you maybe mean "with solving the following equation over the following interval"? 3 tan 2x + sin 2x = 0 between 0 and 180 What I got is: sin 2x (3 - cos 2x) = 0 How did you get this? It doesn't have the same solution or graph: http...
by FWT
Mon May 25, 2015 4:52 pm
Forum: Calculus
Topic: Differatiation: normal to y=2x/(x^2+1) at a point (3;0,6)
Replies: 1
Views: 305

Re: Differatiation: normal to y=2x/(x^2+1) at a point (3;0,6)

find the equation of the normal line to the curve y=2x/(x^2+1) at a point (3;0,6) and also that of the tangent. Calculus: What did you get for the derivative of y? Algebra: What did you get when you plugged x = 3 into the derivative? So what is the slope at x = 3? Using this slope and the point the...
by FWT
Fri May 22, 2015 10:55 am
Forum: Intermediate Algebra
Topic: Substituting a Zero into a negative variable
Replies: 8
Views: 420

Re: Substituting a Zero into a negative variable

TepNosreProgger wrote:its not from thier post,
after referencing nona.m.nona 's post i plugged in the equation i'm trying to solve
TepNosreProgger wrote:so i'm trying to substitute this (1x^2 + 0x + 1 = 0) into the quadratic formula

How did you get b^2 - 4ac = -16 from a = 1, b = 0, and c = 1?
by FWT
Sat May 02, 2015 8:26 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: Complex Numbers Exponential Form
Replies: 1
Views: 357

Re: Complex Numbers Exponential Form

Coverct to rectanguala a+bi z = e^(3-i pi/2) Exponential form (starting about 2/3 of the way down here ) looks like: . . . z\, =\, r\, e^{i\theta} Use rules of exponents to convert your right-hand side expression into the normal format: . . . e^{3\, -\, \frac{i\,\pi}{2}} \, =\, e^3\, e^{-\frac{i\,\...
by FWT
Thu Apr 16, 2015 5:07 pm
Forum: Geometry
Topic: find the area of a square inscribed in a circle
Replies: 1
Views: 5478

Re: find the area of a square inscribed in a circle

find the area of a square if it is inscribed in a circle in which one arc intercepted by a side of the square has length 12pi. Draw the square. Draw the circle inside. Draw horizontal and vertical lines through the center that split the square into four equal smaller squares. Label one of the small...
by FWT
Tue Mar 17, 2015 1:18 pm
Forum: Intermediate Algebra
Topic: Keep getting wrong answer
Replies: 1
Views: 620

Re: Keep getting wrong answer

I get the wrong answer for 5 = 1/3(-2 + b) The way it's written means 5 = 1/[3(-2 + b)]. But I think you mean 5 = (1/3)(-2 + b). Is this right? I get b = 17 for the answer. But the book works it and comes up with an answer b = 17/3 You can check the answers by plugging them back into the original e...
by FWT
Tue Mar 17, 2015 1:14 pm
Forum: Geometry
Topic: area of a triangle
Replies: 1
Views: 5540

Re: area of a triangle

Hi, I am have trouble with this problem. Find the area of triangle with angles 45-15-120. The side across from the 120 degree angle is 10. I need to solve without Trig. Similar problems have found 30-60-90 or 45-45-90 triangles in problem and used them to find the solution. But I am stumped....Ed H...
by FWT
Sat Mar 14, 2015 2:04 pm
Forum: Pre-Algebra
Topic: Payment formula
Replies: 2
Views: 1238

Re: Payment formula

I'm trying to find the right formula to calculate mortgage installment. If I use a = j_0 r^n \frac{r-1}{r^{n+1}-r} i get results nearly the same as form online mortgage calculator , but not exactly the same. Where is the problem? We don't know what formula the calculator is using, what the variable...
by FWT
Tue Feb 17, 2015 1:10 am
Forum: Discrete Math
Topic: Express how many ways you can select a representative
Replies: 1
Views: 386

Re: Express how many ways you can select a representative

Assume that a school has these three teams: Chess team with 10 members, Checkers team with 15 members, and College bowl team with 20 members. In how many ways can we select rep of the school if there should be: 1. exactly 1 representative from each team. Do the multiplication formula they showed yo...

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