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by theshadow
Tue Jan 27, 2015 10:43 pm
Forum: Trigonometry
Topic: Angle of an Isosceles triangle for any opposite side length.
Replies: 2
Views: 196

Re: Angle of an Isosceles triangle for any opposite side len

ABC is a triangle. Opposite the vertices A, B, and C are the sides a, b, and c, respectively. (thanks for the syntax help). This is an Isosceles triangle since a and b are the same length. What formula can I use to determine the angle C for a given c. I am trying to write a function that will retur...
by theshadow
Fri Jan 16, 2015 3:34 am
Forum: Intermediate Algebra
Topic: reverse formula
Replies: 4
Views: 414

Re: reverse formula

Dear Forum members , Can someone help me to turn this formula so I can calculate ta . thank you in advance, Mon. P = P50 [ (ti - tr) / ln( (ti - ta) / (tr - ta) ) 1 / 49.32 ]n (1) ta = ........ I don't know what you mean by "turning" the "formula" to calculate "ta". Ma...
by theshadow
Thu Jan 15, 2015 1:18 pm
Forum: Intermediate Algebra
Topic: Help to create an Algebraic equation
Replies: 3
Views: 309

Re: Help to create an Algebraic equation

A couple living together have a combined bill payment of $1600. Jane makes a wage of $2900 a month and John makes a wage of $2000 a month. To make it fair John should pay a bit less percentage of his wage (being the lesser income maker) towards the bill so they have an equal amount percentage of in...
by theshadow
Sun Jan 11, 2015 4:30 am
Forum: Advanced Algebra ("pre-calculus")
Topic: Difficult question
Replies: 7
Views: 547

Re: Difficult question

the question is how long does it take to get to 180 feet. I tried to come up with an answer using the equation you provided but am having a trouble breaking it down. I came up with h(t) = 16t^2-144t+180 and I cant get it simplified enough to solve for t. There's nothing to solve the way you're doin...
by theshadow
Sun Jan 11, 2015 4:27 am
Forum: Trigonometry
Topic: trig identities...again
Replies: 1
Views: 239

Re: trig identities...again

I'm stuck on one of the last questions in my textbook and would appreciate any help... Use the sum or product identities to simplify the following [sin(@)+2sin(2@)+sin(3@)] / [cos(@)+2cos(2@)+3cos(3@)] I was going to ask if theres supposed to be a 3 in front of the sin(3@) but Wolfram Alpha can't s...
by theshadow
Tue Dec 16, 2014 2:41 pm
Forum: Geometry
Topic: Find the area of polygon
Replies: 3
Views: 560

Re: Find the area of polygon

I have read in easycalculation site that using pick's theorem, area of the polygon can be calculated by joining the lattice points...Need more explanation on this. The formula looks pretty easy: count the points "i" inside, count the points "b" on the edge ("boundary")...
by theshadow
Tue Nov 18, 2014 12:13 pm
Forum: Intermediate Algebra
Topic: Relationship between a square and a parabola?
Replies: 3
Views: 713

Re: Relationship between a square and a parabola?

In other words, the "square" in "completing the square" has nothing to do with the four-cornered geometrical shape. It has to do with moving something around until you get it to be something that is the square (to the power 2) of something else. The shape of the graph is always g...
by theshadow
Wed Nov 12, 2014 12:51 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: Sequences
Replies: 2
Views: 615

Re: Sequences

"Find first 4 terms" c_0=-2, c_j=\frac{c_j_-_1}{(j+1)(j+2) , j\geq1 So, do you start at -2 for j? And then go -1, 0, 1? The -2 is the value for the first term. The j is the counter. They're totally separate things. c_0 could be anything: 3, -100, 87, etc. It's just what yo...
by theshadow
Wed Nov 12, 2014 12:49 pm
Forum: Intermediate Algebra
Topic: Simplify Negative square roots.
Replies: 1
Views: 441

Re: Simplify Negative square roots.

How do you simplify this: (-15 ± sqrt(-675)) / 50. They show step-by-step examples here . Start by factoring everything: 675 = 25*9*3, 15 = 5*3, 50 = 5*5*2. (You do squares for the 675 b/c you're inside a radical so you need squares to take out.) Then sqrt(-675)=sqrt(-1)sqrt(25)sqrt(9)sqrt(3). Take...
by theshadow
Mon Oct 27, 2014 11:10 am
Forum: Intermediate Algebra
Topic: Many problems
Replies: 1
Views: 472

Re: Many problems

1. Solve for x. Show all work. 3x^2-1x/2=-3/4 Is the LHS 3x^2 - (1/2)x or is it (3x^2 - x)/2? Either way, move the -3/4 to the LHS, times thru by 4 to get rid of the denom's, and then solve. Do you know the quadratic formula ? 2. If mn=5 and m-3n=8, what is m^2n-3mn^2. (p.s. the m^2n is like m^2*n)...

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