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Denis
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Denis
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Join Date
02-17-2004
Last Activity
Today
07:12 AM
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Denis
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Yesterday,
05:54 PM
Denis
replied to a thread
solve an equation with a variable exponent using logaritms
in
Intermediate/Advanced Algebra
10 * 2^x - 8 * 5^(x-2) = 0 10 * 2^x = 8 * 5^(x-2) = 0 2^x / 5^(x-2) = 8 / 10 Carry on...(remember that 5^(x-2) = 5^x / 5^2)
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9 replies | 140 view(s)
Yesterday,
12:20 PM
Denis
replied to a thread
Point of intersection of circle and parabola
in
Beginning Algebra
Your equations: (x-2)^2 + (y-3)^2 = 6 y = -2x^2 + 14x - 1 Simplify and rearrange: x^2 - 4x + y^2 - 6y = -7 -2x^2 + 14x - y = 1 Now...
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2 replies | 78 view(s)
05-18-2018,
05:01 PM
Denis
replied to a thread
Payout Annuity Problem: Jim won jackpot of $15 million
in
Finance/Business Math
Ain't even a "guessed right": it's more "luckily matching the silly lecturer's intent"! Wether that stupid interest rate compounds only once per...
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11 replies | 301 view(s)
05-18-2018,
09:22 AM
Denis
replied to a thread
Help on question from AS paper
in
Intermediate/Advanced Algebra
com-ple-ment noun 1. something that completes or makes perfect: A good wine is a complement to a good meal. 2. the quantity or amount...
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7 replies | 152 view(s)
05-18-2018,
09:18 AM
Denis
replied to a thread
Help on question from AS paper
in
Intermediate/Advanced Algebra
Agree! However, the "exam" was over, and the "class" was kinda fooling around with this...so was simply trying "to be nice" :rolleyes:
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7 replies | 152 view(s)
05-18-2018,
09:12 AM
Denis
replied to a thread
Have to solve x^2 + 2x + 8 = 0; answer should be R
in
Beginning Algebra
Are you sure that's not x^2 + 2x - 8 = 0? Then x = 2 or -4
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3 replies | 104 view(s)
05-18-2018,
08:55 AM
Denis
replied to a thread
Old account issue: please help
in
Administration Issues
Was this the account: https://www.freemathhelp.com/forum/threads/69299-split-decagon-Geometry-Homework?highlight=mathwhiz Can't help you...
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2 replies | 108 view(s)
05-17-2018,
07:35 PM
Denis
replied to a thread
Help on question from AS paper
in
Intermediate/Advanced Algebra
Problem can be worded this way: prove that all numbers ending with 1,3,7 or 9 to the power 4 end with 1. 1^4 = 1 3^4 = 81 7^4 = 2401 9^4 = 6561...
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7 replies | 152 view(s)
05-17-2018,
12:39 PM
Denis
replied to a thread
Determine Cubic Feet Used: For one quarter, a home owner's water bill was $9.38.
in
Arithmetic
Oh boy...ok ok...I'll go stand in the corner...
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12 replies | 330 view(s)
05-17-2018,
11:36 AM
Denis
replied to a thread
Payout Annuity Problem: Jim won jackpot of $15 million
in
Finance/Business Math
My 74,245 assumed 5% APR cpd monthly, your friend's 73,557 assumes 5% effective: she knows what she's doing! :rolleyes: However, the difference is...
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11 replies | 301 view(s)
05-17-2018,
11:04 AM
Denis
replied to a thread
Is this conversion valid? Y = u + v − v *t* Y + I + G to Y (1 − v + v* t) = u + I + G
in
Beginning Algebra
w = I + G, y = Y :rolleyes: Your initial equation: y = u + v − vty + w re-arranged: y + vty - v = u + w So we have: y(tv + 1) - v = u + w or:...
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6 replies | 124 view(s)
05-17-2018,
09:08 AM
Denis
replied to a thread
Is this conversion valid? Y = u + v − v *t* Y + I + G to Y (1 − v + v* t) = u + I + G
in
Beginning Algebra
Where did the Z go?! Plus you're showing 2 equal signs... Please repost the original equation PROPERLY. Also, use u instead of c 0 and v instead...
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6 replies | 124 view(s)
05-16-2018,
07:14 PM
Denis
replied to a thread
Payout Annuity Problem: Jim won jackpot of $15 million
in
Finance/Business Math
Well, if that problem was made up by your lecturer, then your lecturer should be fired! :rolleyes: All there is that can be calculated is the...
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11 replies | 301 view(s)
05-16-2018,
04:28 PM
Denis
replied to a thread
Need help plz: Mark arrived at his office at 12 pm. If he had increased his speed...
in
Beginning Algebra
Another way: m = Mark's original speed, v = minutes at original speed. @m.................................>v min ...
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4 replies | 150 view(s)
05-16-2018,
01:22 PM
Denis
replied to a thread
Determine Cubic Feet Used: For one quarter, a home owner's water bill was $9.38.
in
Arithmetic
Remove the 1200 part: water bill for $2.88, representing .40 per hundred cubic feet; how many cubic feet? 2.88 / .40 * 100 = 720 Over and out!
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12 replies | 330 view(s)
05-14-2018,
10:34 PM
Denis
replied to a thread
Little algebra problem (puzzle): [a/(ab+a+1) + b/(bc+b+1) + c/(ca+c+1)]^2
in
Math Odds & Ends
1
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2 replies | 134 view(s)
05-13-2018,
09:17 AM
Denis
replied to a thread
how to set this up? 3mph walking away; 6mph running back; 30 min total time; find d
in
Intermediate/Advanced Algebra
WHY are you asking that question? Makes no sense... Look at it this way: @3mph...........d............>@6mph...........d.............>total of...
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30 replies | 1061 view(s)
05-12-2018,
09:44 PM
Denis
replied to a thread
Can this triangle be solved? 1 angle, 1side, and the sum of the other two sides known
in
Geometry and Trig
Methinks this can be solved pretty much directly; 1 solution only. Draw perpendicular CH (H on AB); let h = CH. We now have 2 right triangles:...
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4 replies | 222 view(s)
05-11-2018,
04:44 PM
Denis
replied to a thread
Find common hypotenuse for 2 triangles: boiled down to Y/sin(x) = Z/sin(A-x)
in
Geometry and Trig
Please post the original problem IN FULL... What you posted is useless.
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4 replies | 203 view(s)
05-11-2018,
04:38 PM
Denis
replied to a thread
how to set this up? 3mph walking away; 6mph running back; 30 min total time; find d
in
Intermediate/Advanced Algebra
Darn it Al, just solve this for d: d/3 + d/6 = 1/2 1st step: multiply the equation by 6
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30 replies | 1061 view(s)
05-11-2018,
10:06 AM
Denis
replied to a thread
how to set this up? 3mph walking away; 6mph running back; 30 min total time; find d
in
Intermediate/Advanced Algebra
d = distance d/3 + d/6 = 1/2 : 30 min = 1/2 hr Solve for d
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30 replies | 1061 view(s)
05-09-2018,
07:11 PM
Denis
replied to a thread
Texas Hold'Em: Probability of better hand after two additional cards dealt
in
Probability / Statistics
Huh? WHO are you addressing? soccergirl (whoever she is)???
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4 replies | 370 view(s)
05-09-2018,
02:10 PM
Denis
replied to a thread
1000 lamps: 10% of a stock of 1000 light bulbs are faulty....
in
Probability / Statistics
To verify, contact Alladin :idea:
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11 replies | 353 view(s)
05-08-2018,
02:01 PM
Denis
replied to a thread
Linear eqns: Driver 1 goes V_1 for t_1 hrs; Driver 2 goes V_2 for another t_2 hours.
in
Beginning Algebra
Using a and b for speeds, u and v for hours; hr = hours: 0 hr(@a kmh)....................................>(u+v) hr u hr(@b...
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7 replies | 318 view(s)
05-06-2018,
06:20 PM
Denis
replied to a thread
Please help me w/ this finance math problem: time to pay off a $125000 mortgage?
in
Finance/Business Math
I can't follow what you're doing... GIVEN: r = .055, a = 125000, p = 710 n = total number of months = ? i = r/12 (monthly rate) p = ai / :...
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2 replies | 152 view(s)
05-06-2018,
01:22 PM
Denis
replied to a thread
Algebraic fractions in a linear sequence: 2/x+3, (missing term), 2/2x-3
in
Beginning Algebra
u = x+3, v = 2x-3 a = 2/u, b = ?, c = 2/v b = (a + c) / 2 = (2/u + 2/v) / 2 = (u + v) / (u*v) = same as Halls! Some "cutish" examples (x: a,...
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5 replies | 297 view(s)
05-05-2018,
03:37 PM
Denis
replied to a thread
math software
in
News
Carloyn, why are you reviving old threads?
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2 replies | 3070 view(s)
05-04-2018,
04:27 PM
Denis
replied to a thread
What is the sum?
in
Math Odds & Ends
Yaaaa...true...I still fall off the potty :(
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8 replies | 257 view(s)
05-04-2018,
04:24 PM
Denis
replied to a thread
Trig Prob's of Semester: vertical aerial, ship leaving Takoradi Harbour, plane course
in
Geometry and Trig
You got 3 problems in that mess. Suggestion: post each separately (after turning the Caps Lock off!). show your work on each.
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7 replies | 380 view(s)
05-04-2018,
04:13 PM
Denis
replied to a thread
Solve for x please -2e^-x = ??
in
Beginning Algebra
too bad, so sad :p
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7 replies | 434 view(s)
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About Denis
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About Denis
Location:
Ottawa, Ontario
Interests:
puzzles
Occupation:
retired
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I'm just an imagination of your figment !
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Last Activity
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07:12 AM
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