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Type: Posts; User: reinsuranc

1. ## Question: Transpose this formula

by reinsuranc
2
Views
878

### a = b/(b+3) a(b+3) = b ab + 3a = b 3a = b - ab...

a = b/(b+3)
a(b+3) = b
ab + 3a = b
3a = b - ab = b(1-a)

3/(1-a) = b
2. ## Question: Probability of three fair dice

by reinsuranc
2
Views
1,734

### The probability of getting exactly two 1's is...

The probability of getting exactly two 1's is 3*[(1/6)^2]*(5/6) = 15/216.

(The 3 takes care of which of the three dice gives doubles - there are 3 possibilities.

The probability of getting...
3. ## Question: Someone give me a pat on the back.

by reinsuranc
8
Views
1,208

### Congratulations! Lots of math majors consider...

Congratulations! Lots of math majors consider the Praxis II Math exam to be quite a difficult exam!

I also passed that exam. I was aided immeasurably by the sample problems and solutions at...
4. ## Question: Math Major for College

by reinsuranc
3
Views
810

### Does the military still offer college level...

Does the military still offer college level correspondence courses? I took one many years ago and found it perfect - you study at your own pace, you get individual instructor comments on your...
5. ## Question: Need Praxis II sample math problems

by reinsuranc
2
Views
21,231

### Need Praxis II sample math problems

I am taking the Praxis II math exam. I didn't think the ETS study guide gives enough sample problems. I think the commercial publisher study guides are written from the point of view of academics,...
6. ## Question: Trigonometry (bearings)

by reinsuranc
4
Views
15,996

### A 290 degree angle is equivalent to a -70 degree...

A 290 degree angle is equivalent to a -70 degree angle. Draw a -70 degree angle from the x axis, and call it theta. Let the length of the diagonal line be 130. Draw a line from the x axis to where...
7. ## Question: Math

by reinsuranc
2
Views
1,448

### F is linear. G is exponential.

F is linear. G is exponential.
8. ## Question: Calculus implicit differentiation

by reinsuranc
1
Views
3,974

### 4x^2y - 3y = x^3 The above is unclear; is...

4x^2y - 3y = x^3

The above is unclear; is (2y) the exponent? I am guessing only the 2 is an exponent.

I'll do Part b):

(4x^2)(y) - 3y = x^3
9. ## Question: Probability

by reinsuranc
1
Views
1,535

### Add up each row and each column first. I...

Add up each row and each column first.

I assume you want probabilities.

Positive: 331/2000
Positive and uses: 297/2000
Negative, given uses: 3/300
Doesn't use, given positive: 34/331
10. ## Question: Dividend Growth - Over 3 years

by reinsuranc
1
Views
1,958

### In year 1 the dividend is 2. Its PV is 2/1.1 ...

In year 1 the dividend is 2. Its PV is 2/1.1

In year to the dividend is 2*1.2. Its PV is (2*1.2)/(1.1^2)

In year 3 the dividend is 2*(1.2^2). Its PV is 2*(1.2^2)/(1.1^3).

by reinsuranc
4
Views
1,195

### The web is not governed by any business law? ...

The web is not governed by any business law?

That is absolutely false.

Violate a law on the web and see which of us is right.
12. ## Question: Home run business

by reinsuranc
3
Views
2,229

13. ## Question: Mary Kay Consultant

by reinsuranc
6
Views
8,090

### I suggest you specialize in a particular...

I suggest you specialize in a particular audience: teenage girls, church groups, workplace groups, etc. Each group would have unique marketing. You wouldn't market teenage girls the same way you...
14. ## Question: Help w/ bonds and interest on them

by reinsuranc
3
Views
3,034

### The annual interest is the face value times the...

The annual interest is the face value times the coupon rate: \$40 million times 11%.

The market interest rate affects the price of the bond, but not the annual interest.
15. ## Question: Polynomial Functions

by reinsuranc
1
Views
1,647

### f(x) = x(x-4)(x+2) f(2x) = 2x(2x-4)(2x+2) If...

f(x) = x(x-4)(x+2)
f(2x) = 2x(2x-4)(2x+2)

If f(2x)=0, then (2x=0) or (2x-4 = 0) or (2x+2 = 0),
so x=0 or x=2 or x=-1.
16. ## Question: Finance

by reinsuranc
2
Views
1,453

### 100/(1.08)^10=46.32

100/(1.08)^10=46.32
17. ## Question: Algebra 2 need help! Systems of equations!

by reinsuranc
3
Views
1,709

### I'll answer the first one: Starting with: 1x...

Starting with:
1x + 0y = -2
0x + 1y = +1.

Replace 1st equation with: Multiply 1st equation by 2 and add 2nd equation: 2x +1y = -3.

Replace 2nd equation with:...
18. ## Question: Finding the inverse

by reinsuranc
2
Views
1,390

### These are not equivalent. y=(x+2)^2+1 =(x^2)...

These are not equivalent.

y=(x+2)^2+1
=(x^2) + (4x) + 4 + 1
=(x^2) + (4x) + 5.

y=(x-2)^2+1
=(x^2) - (4x) + 4 + 1
19. ## Question: Calculus help on limits

by reinsuranc
4
Views
3,171

### Hi, You need to do a little better job in this...

Hi,

You need to do a little better job in this forum with making the problem clear regarding where the square root sign ends and where the denominator ends.

for what...
20. ## Question: Pre-Calculus - first the basics

by reinsuranc
3
Views
5,558

### A few more details

x^2 + y^2 = 5
x = y + 1
(y+1)^2 + y^2 = 5
y^2 +2y +1 +y^2 - 5 =0
2y^2 + 2y -4 = 0
y^2 +y -2 = 0
(y + 2)(y - 1) = 0
y roots are -2 and +1.
corresponding x values are -1 and 2.
21. ## Question: Solving Functions

by reinsuranc
5
Views
17,179

### My attempt - two out of three

A.
f(u)=u^2+u and g(x)=2x+1
Let u=g(x)=2x+1
f(g(x))=f(u)=(2x+1)^2+(2x+1).

B.
I don't understand the next part of the problem.
You have not defined g(circle)f.
22. ## Question: Distance Learning for Advanced Math

by reinsuranc
0
Views
904

### Distance Learning for Advanced Math

Hi,

I am looking for distance learning for advanced math.

As an example, I am looking for a course in Game Theory and a course in Number Theory. These are junior or senior level college math...
23. ## Question: Probability

by reinsuranc
1
Views
1,143

### Draw a rectangle, representing the sample space....

Draw a rectangle, representing the sample space. The sum of all probabilities in the rectangle equals 1.

Within the rectangle, draw two circles A and B that have a portion of their area...
24. ## Question: Termination of At Will Employment

by reinsuranc
3
Views
1,922

### At Will

I am not a lawyer either. But I thought employment at will means there does not need to be a reason for discharging an employee.

It's not fair, but that's how it is.
25. ## Question: Functions

by reinsuranc
7
Views
1,836

### How would you determine the domain and range of...

How would you determine the domain and range of y=x^4-4x^2?

y = (x^4) - 4*(x^2)
y = (x^2) * (x^2 - 4); this says there zeroes at 2 and -2, and two zeroes at x=0.

y' = 4*(x^3) - 8x; set equal...
26. ## Question: Statistics

by reinsuranc
2
Views
2,304

### Either a delivery is on time (

Either a delivery is on time (<= 10 minutes), or it isn't, so assume this is a binomial distribution with n=100, p=.9, q=1-p=.1

Then, for a binomial distribution,
mu=np=90, and...
27. ## Question: Statistical test for discrimination in employment

by reinsuranc
0
Views
963

### Statistical test for discrimination in employment

Hi,

1. How does one test that a particular employee benefit does not discriminate against lower-paid employees?

2. How does one test that the workforce is adequately representative of...
28. ## Question: Logarithms

by reinsuranc
1
Views
2,368

### log(b^a)=a*log(b) log(16) = log(4^2) = 2 log4...

log(b^a)=a*log(b)

log(16) = log(4^2) = 2 log4 = 2*.602 = 1.204

log(1/3) = log(3^-1) = -log3 = -.477
29. ## Question: Algebra! Help!

by reinsuranc
1
Views
1,951

### This was not a "couple of problems." You're not...

This was not a "couple of problems." You're not expecting us to do all your homework, are you?

Why don't you show us how far you got on each of them and we can show you where you might have gone...
30. ## Question: Math problems

by reinsuranc
2
Views
1,631

### Find the value of r

Find the value of r so that the line that passes through (-4, 3) and (2, r) has a slope of m= 2/3.

If (x1,y1) and (x2,y2) are two points, then the slope of the straight line that connects the...
31. ## Question: Curve fittings

by reinsuranc
1
Views
1,306

### Curve Fitting

Please explain a little better what you are trying to do.

For example, do you have a table of values of x and y, and are you trying to interpolate to find an intermediate value? Or are you trying...
32. ## Question: Determining Values from a 3variable equation

by reinsuranc
1
Views
1,293

### Intersecting the x-axis means y=0. ...

Intersecting the x-axis means y=0.

2x^2-2x+3k=0.

x=( 2 plusorminus squareroot(4 - 4*2*3*k) )/4.

Intersecting at two distinct points means the term under the...
33. ## Question: Statistics@ Jar of coins expected value

by reinsuranc
2
Views
2,463

### I don't know what you mean by expected gain here....

I don't know what you mean by expected gain here.

The expected value is the mean, 160.
34. ## Question: Are these Values Correct for These Equations and/or how to do I check?

by reinsuranc
1
Views
1,328

Start with the quadratic in the form y = a*x^2 + b*x + c. If the quadratic is not in that form, manipulate it until it is.

If a>0, the parabola is U-shaped; if a<0, the parabola is upside-down...
35. ## Question: Squaring both sides twice

by reinsuranc
3
Views
2,093

### x^.5 + (x-5)^.5 = 5

It is easier to write such equations on this board as x^.5 + (x-5)^.5 = 5, instead of trying to draw square root symbols.

The answer to the above is 9:

x^.5 + (x-5)^.5 = 5

(x^.5 - 5)^2 = (...
36. ## Question: Algebraic Equations Max and Min Problem Solving

by reinsuranc
17
Views
3,623

### So we have found two ways to construct these...

So we have found two ways to construct these areas. The first way uses six equal lengths of fence, 6x=200, x=33.3. The second way uses five equal lengths of fence, 5x=200, x=40.

The first way...
37. ## Question: Solving Quadratic Equations to Graph

by reinsuranc
3
Views
4,298

### Graphing

If a>0, the parabola is U-shaped; if a<0, the parabola is upside-down u-shaped.

If a>0, the minimum y value is at the point called the...
38. ## Question: Inequalities problem solving

by reinsuranc
3
Views
5,926

### This is not about inequalities

Let B = number miles Brandon drove, and
let P = number of miles Pat drove.

We can write one equation about kilometers:

Bx100 + Px90 = 545.

We can also write one equation about hours:

B...
39. ## Question: Trigonometry problem

by reinsuranc
1
Views
5,057

### This was hard

I'll set it up: you can finish it. This was not easy.

Let line a1 be y=(squareroot3)(x).
Let line a2 be y=mx, with m unknown, such that
the lines intersect at (0,0) making an acute angle A.
...
40. ## Question: Trig problem

by reinsuranc
3
Views
4,403

### Use the Law of Cosines

Let a, b, and c be the lengths of the legs of a triangle opposite angles A, B, and C. Then the law of cosines states

a^2 = b^2+c^2-2bccosA
b^2 = a^2+c^2-2accosB
c^2 = a^2+b^2-2abcosC.
...
41. ## Question: Can some one proof read this THANKS

by reinsuranc
4
Views
1,421

### Grammatical errors

There certainly are plenty of grammatical errors, starting with the first sentence:

I am Ralph Smithbullet your nephews friend met on the island.

For example, I would rewrite as:

I am...
42. ## Question: Math problem

by reinsuranc
10
Views
3,179

### Converting Fahrenheit to Centigrade and vice versa

I memorized those conversion formulas when I was a kid, and long forgot them.

However, I can derive them if I need them.

I know two points for values of Centigrade and Fahrenheit, freezing and...
43. ## Question: Need Help Please

by reinsuranc
2
Views
2,739

### Solve this equation

This would be an equation if it ended with "equals zero".

Assuming that is what you intended, the largest exponent of x is 2. That makes this a quadratic equation. There is a formula called the...
44. ## Question: Statistics

by reinsuranc
1
Views
2,754

### Distribution of the mean

The distribution of the mean is approximately normal, with mean approximated by XBAR = 123, and standard deviation approximated by SD/SQUAREROOT(n) = .08/SQUAREROOT(3).

Given the above, it is then...
45. ## Question: Percentages

by reinsuranc
1
Views
1,339

### I'll set it up - you solve it

Currently Lead has 20 kg and is 6% of what total? 20 = 6% of X, X = 20/6% = 333.33 kg.

Currently Copper is 60% of 333.33 = 200 kg. Currently Zinc is 34% of 333.33 = 113.33 kg.

46. ## Question: Varying your wardrobe

by reinsuranc
1
Views
2,441

### Close

The answer should be 2x2x2x2=16, so you are missing one possible wardrobe.

by reinsuranc
1
Views
2,592

### The equation of a circle with center x=h and y=k...

The equation of a circle with center x=h and y=k and radius r, is:

(x - h)^2 + (y - k)^2 = r^2. Here I am using the symbol ^ to indicate exponentiation.

In your example, h=-2, k=1, r=2.
...
48. ## Question: Calculating pi to n decimal places

by reinsuranc
5
Views
5,980

### Lookup in Excel

Thank you, but no, that's not what I was after.

Using the Excel built-in function is sort of similar to a table lookup.

What did we do before Excel to CALCULATE, not look up, the value of pi?
...
49. ## Question: Calculating pi to n decimal places

by reinsuranc
5
Views
5,980

### Calculating pi to n decimal places

Suppose your goal is to calculate (not look up) a value of pi that is accurate to n decimal places. Suppose n were 10. How would you do it?
50. ## Question: Probability

by reinsuranc