View Profile: Denis - Free Math Help Forum

Yesterday, 10:20 PM

Denis replied to a thread Quadratic simultaneous equation in Beginning Algebra

Jomo oh Jomo yo my zero, whoops hero !!

11 replies | 167 view(s)

Yesterday, 06:59 PM

Denis replied to a thread Quadratic simultaneous equation in Beginning Algebra

Ya made zee typo Halls... aNUTter way: x^2 + y^2 = 5 y - x = 3 ^2 : x^2 - 2xy + y^2 = 9 Subtract from : xy = -2

11 replies | 167 view(s)

Yesterday, 12:23 PM

Denis replied to a thread Simple logarithm question: simplify log(10)^5/log(10)^2 as log(10)^3 in Intermediate/Advanced Algebra

WHY do you say it's "wrong"? Havva look: http://www.wolframalpha.com/input/?i=log(10)%5E5%2Flog(10)%5E2%3Dlog(10)%5Ex

7 replies | 92 view(s)

Yesterday, 12:13 PM

Denis replied to a thread Quadratic simultaneous equation in Beginning Algebra

Did you make that up? If not, is it the original problem IN FULL? What do you mean with "simultaneous quadratic equations"? After substituting (as...

11 replies | 167 view(s)

Yesterday, 12:00 PM

Denis replied to a thread Find for X for m(RXM)=x+81 (Geometry Question) in Beginning Algebra

http://mathonweb.com/help_ebook/html/equations_1.htm

6 replies | 106 view(s)

Yesterday, 09:53 AM

Denis replied to a thread Find for X for m(RXM)=x+81 (Geometry Question) in Beginning Algebra

VERY good idea :rolleyes:

6 replies | 106 view(s)

04-16-2018, 10:09 PM

Denis replied to a thread triangle and trapeze problem pls help in Geometry and Trig

Yer correct Doc: should be the parallel sides. He made same goof here (but corrected it):...

3 replies | 105 view(s)

04-16-2018, 06:35 PM

Denis replied to a thread Logic Q's: "Beatrice ate 2/3 as many cakes as Annabel would have eaten...." in Math Odds & Ends

1st one looks like: B = A - 3 A = B/2 + 6 No idea about the 2nd; seems that number 1201 is involved...

4 replies | 100 view(s)

04-16-2018, 06:12 PM

Denis replied to a thread How much simple interest would be paid on a loan of $1950 at 8.1% for 70 months? in Pre-Algebra

Betya a Canuk Toonie answer is 921.375:rolleyes:

5 replies | 240 view(s)

04-15-2018, 07:43 PM

Denis replied to a thread How much simple interest would be paid on a loan of $1950 at 8.1% for 70 months? in Pre-Algebra

1950*.081/360*30 would be the monthly payment (if such is the arrangement) which means 1950 would still be due after 70th payment. "We went over...

5 replies | 240 view(s)

04-15-2018, 01:19 PM

Denis replied to a thread Can someone help with the below please: circle inscribed in square w/ area 196cm^2 in Geometry and Trig

Agree...but this one is "close": 11 / 14 = .7857142.... pi * 14 / 56 = .7853981.... Just another "badly written problem":confused:

5 replies | 134 view(s)

04-15-2018, 12:32 PM

Denis replied to a thread Word Problem Help? "Dave and Sandy are frequent flyers with a particular airline...." in Beginning Algebra

A simple diagram = 1000 words! p = plane speed, w = wind speed (@p-w)..............876...............>2 hr : clearly p-w = 876/2 1.5...

3 replies | 113 view(s)

04-15-2018, 12:08 PM

Denis replied to a thread Can someone help w/ 3x – 2 = 7, 10 – 2x = 6, 0.2x + 5 = 10 (& 15 more) in Intermediate/Advanced Algebra

Are you serious?! This is not a "we do homework" site. Is your teacher aware that you're doing this?

2 replies | 84 view(s)

04-15-2018, 12:03 PM

Denis replied to a thread The mean of this sequence of five numbers: 2, N, N+2, 11, 14 is 7.8 in Arithmetic

Hint: n(n+1)/2 In that sequence, n = 5 5(5 + 1) / 2 = 15

4 replies | 218 view(s)

04-14-2018, 01:57 PM

Denis replied to a thread Basic algebra help please in Beginning Algebra

x = 3 + 5 + 9 x = ? 3 + 5 = 8 x = 8 + 9 x = 17 Get my drift? :p

5 replies | 163 view(s)

04-14-2018, 12:40 PM

Denis replied to a thread Geometric sequences: how to systematically work them out using a method in Intermediate/Advanced Algebra

7 21 63 189 : sum = 280 a = 1st term = 7 r = ratio = 3 n = number of terms = 4 sum = a(r^n - 1) / (r - 1) = 280 HOKAY?

9 replies | 274 view(s)

04-13-2018, 08:02 PM

Denis replied to a thread Geometric sequences: how to systematically work them out using a method in Intermediate/Advanced Algebra

Work what out? 2,6,18,54,162 is also a geometric sequence.

9 replies | 274 view(s)

04-13-2018, 07:52 PM

Denis replied to a thread Denis Is Jealous in Math Odds & Ends

Her autograph, of course...

6 replies | 113 view(s)

04-13-2018, 03:57 PM

Denis replied to a thread Stumped by a story problem: "A candy maker makes two sizes of candies...." in Beginning Algebra

Hint: S = 15 - L

3 replies | 93 view(s)

04-13-2018, 02:12 PM

Denis replied to a thread I need an equation: I have the weights of two ingredients... in Beginning Algebra

Changing r and i to a and b, k and s to x and y. Problem rewritten this way: We have the weights of two ingredients: weight of ingredient 1 = a...

5 replies | 177 view(s)

04-13-2018, 01:36 PM

Denis replied to a thread Denis Is Jealous in Math Odds & Ends

YAHOO! She said YES! And told me she had already turned Jomo down :p

6 replies | 113 view(s)

04-12-2018, 07:30 PM

Denis replied to a thread Denis Is Jealous in Math Odds & Ends

Deal!!

6 replies | 113 view(s)

04-12-2018, 05:57 PM

Denis replied to a thread SAT practice question: Rational equations (3^2 = a-1, so a=10) in Intermediate/Advanced Algebra

It did not turn into a ten: 9 = a-1

5 replies | 105 view(s)

04-12-2018, 05:39 PM

Denis started a thread Denis Is Jealous in Math Odds & Ends

Sally sure earns a lotta money: got her phone number?

6 replies | 113 view(s)

04-12-2018, 05:35 PM

Denis replied to a thread Is this one solvable? in Math Odds & Ends

Rpi = ?

22 replies | 516 view(s)

04-12-2018, 03:33 PM

Denis replied to a thread Paying taxes in "proportion" to our separate incomes in Finance/Business Math

I miss my ex....but my aim is getting better :p

5 replies | 190 view(s)

04-12-2018, 12:42 PM

Denis replied to a thread Electrical Equations Transpoition: solve Zs = Ze+((R1*C1)+(r2*c2)*L)/1000 for L, r2 in Beginning Algebra

Change Zs to a, Ze to b, c2 to c, r2 to r and R1*C1 to d So equation becomes: a = b + (d + r*c*L) / 1000 Then: (d + r*c*L) / 1000 = a - b d +...

6 replies | 190 view(s)

04-12-2018, 09:37 AM

Denis replied to a thread Is this one solvable? in Math Odds & Ends

Jomo, this thread will without fail make you the winner of the "2018 most confusing thread award" :p

22 replies | 516 view(s)

04-11-2018, 04:53 PM

Denis replied to a thread Annuities & Perpetuities: X is thinking of acquiring a house to rent out indefinitely in Finance/Business Math

Are you saying that you calculated 16036 as the annual payment over 5 years to borrow 73440 at rate of 5% p.a.?

2 replies | 170 view(s)

04-11-2018, 04:02 PM

Denis replied to a thread Electrical Equations Transpoition: solve Zs = Ze+((R1*C1)+(r2*c2)*L)/1000 for L, r2 in Beginning Algebra

Bad bracketing! OK?

6 replies | 190 view(s)

Denis
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