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Type: Posts; User: Denis

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by Denis
Replies
11
Views
167

### Jomo oh Jomo yo my zero, whoops hero !!

Jomo oh Jomo yo my zero, whoops hero !!

by Denis
Replies
11
Views
167

### Ya made zee typo Halls... aNUTter way: x^2...

Ya made zee typo Halls...

aNUTter way:

x^2 + y^2 = 5 [1]
y - x = 3 [2]

[2]^2 : x^2 - 2xy + y^2 = 9 [3]

Subtract [1] from [3] : xy = -2
3. ## Thread: Simple logarithm question: simplify log(10)^5/log(10)^2 as log(10)^3

by Denis
Replies
7
Views
92

### WHY do you say it's "wrong"? Havva look:...

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

by Denis
Replies
11
Views
167

### Did you make that up? If not, is it the original...

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 per Jomo's post), you'll end up
with a 4th...
5. ## Thread: Find for X for m(RXM)=x+81, m(RXT)=2x+32 (Geometry Question)

by Denis
Replies
6
Views
107

### http://mathonweb.com/help_ebook/html/equations_1.h...

http://mathonweb.com/help_ebook/html/equations_1.htm
6. ## Thread: Find for X for m(RXM)=x+81, m(RXT)=2x+32 (Geometry Question)

by Denis
Replies
6
Views
107

### VERY good idea :rolleyes:

VERY good idea :rolleyes:
7. ## Thread: triangle and trapeze problem pls help

by Denis
Replies
3
Views
105

### Yer correct Doc: should be the parallel sides. ...

Yer correct Doc: should be the parallel sides.

He made same goof here (but corrected it):
http://mathhelpforum.com/geometry/280461-triangle-trapeze-problem-pls-help.html
8. ## Thread: Logic Q's: "Beatrice ate 2/3 as many cakes as Annabel would have eaten...."

by Denis
Replies
4
Views
100

### 1st one looks like: B = A - 3 A = B/2 + 6 No...

1st one looks like:
B = A - 3
A = B/2 + 6

No idea about the 2nd; seems that number 1201 is involved...

by Denis
Replies
5
Views
240

### 1950*.081/360*30 would be the monthly payment (if...

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 a lot in class and I can't find my notes for this"...
11. ## Thread: Can someone help with the below please: circle inscribed in square w/ area 196cm^2

by Denis
Replies
5
Views
134

### Agree...but this one is "close": 11 / 14 =...

Agree...but this one is "close":
11 / 14 = .7857142....
pi * 14 / 56 = .7853981....

Just another "badly written problem":confused:
12. ## Thread: Word Problem Help? "Dave and Sandy are frequent flyers with a particular airline...."

by Denis
Replies
3
Views
113

### A simple diagram = 1000 words! p = plane...

A simple diagram = 1000 words!

p = plane speed, w = wind speed

(@p-w)..............876...............>2 hr : clearly p-w = 876/2

1.5 hr<..............876..............(@p+w) : clearly p+w =...
13. ## Thread: The mean of this sequence of five numbers: 2, N, N+2, 11, 14 is 7.8

by Denis
Replies
4
Views
218

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

Hint: n(n+1)/2
In that sequence, n = 5
5(5 + 1) / 2 = 15
14. ## Thread: Basic algebra help please

by Denis
Replies
5
Views
163

### x = 3 + 5 + 9 x = ? 3 + 5 = 8 x = 8 + 9 x =...

x = 3 + 5 + 9
x = ?

3 + 5 = 8
x = 8 + 9
x = 17

Get my drift? :p
15. ## Thread: Geometric sequences: how to systematically work them out using a method

by Denis
Replies
9
Views
274

### 7 21 63 189 : sum = 280 a = 1st term = 7 r =...

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?
16. ## Thread: Geometric sequences: how to systematically work them out using a method

by Denis
Replies
9
Views
274

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

Work what out?

2,6,18,54,162 is also a geometric sequence.
17. ## Thread: Stumped by a story problem: "A candy maker makes two sizes of candies...."

by Denis
Replies
3
Views
93

### Hint: S = 15 - L

Hint: S = 15 - L
18. ## Thread: I need an equation: I have the weights of two ingredients...

by Denis
Replies
5
Views
177

### Changing r and i to a and b, k and s to x and y....

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 grams and weight of ingredient 2 = b grams.
...

by Denis
Replies
6
Views
113

Deal!!
20. ## Thread: SAT practice question: Rational equations (3^2 = a-1, so a=10)

by Denis
Replies
5
Views
105

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

It did not turn into a ten:
9 = a-1
21. ## Thread: Denis Is Jealous

by Denis
Replies
6
Views
113

### Denis Is Jealous

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

by Denis
Replies
22
Views
516

Rpi = ?
23. ## Thread: Paying taxes in "proportion" to our separate incomes

by Denis
Replies
5
Views
190

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

I miss my ex....but my aim is getting better :p
24. ## Thread: Electrical Equations Transpoition: solve Zs = Ze+((R1*C1)+(r2*c2)*L)/1000 for L, r2

by Denis
Replies
6
Views
190

### Change Zs to a, Ze to b, c2 to c, r2 to r and...

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 + r*c*L = 1000a - 1000b

Take over: solve for L,...
25. ## Thread: Is this one solvable?

by Denis
Replies
22
Views
516

### Jomo, this thread will without fail make you the...

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