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Distributive-associative-commutative-properties/345510: What are the distributive properties of algebra and what are some examples ?
1 solutions

Answer 247118 by Fombitz(13828) About Me  on 2010-09-20 10:17:36 (Show Source):


test/345463: Please help me solve this equation: Prove the inequality without evaluating the integral. +pi%2F12+%3C=+int+%28+cos%28x%29%2C+dx%2C+pi%2F6%2C+pi%2F3+%29+%3C=+sqrt%283%29pi%2F12+
1 solutions

Answer 247117 by Fombitz(13828) About Me  on 2010-09-20 10:12:27 (Show Source):
You can put this solution on YOUR website!
The value of the cosine function at the endpoints are,
cos%28pi%2F6%29=sqrt%283%29%2F2
cos%28pi%2F3%29=1%2F2
The value of the function in between the endpoints is bounded by those values.
1%2F2%3C=cos%28x%29%3C=sqrt%283%29%2F2
So then integrating,


pi%2F3-pi%2F6=%282pi%29%2F6-pi%2F6=pi%2F6
Substituting,



Problems-with-consecutive-odd-even-integers/345446: I would like help with this question.
If the larger of two consecutive integers is subtracted from twice the smaller integer, then the result is 21. Find the integer.
My book does not give me an example of how to solve this. It shows me how to find even numbers...
Thank You
1 solutions

Answer 247114 by Fombitz(13828) About Me  on 2010-09-20 10:02:43 (Show Source):
You can put this solution on YOUR website!
Let N and N%2B1 be the consecutive integers.
N%2B1 is the larger.
N is the smaller.
2N-%28N%2B1%29=21
2N-N-1=21
N-1=21
highlight%28N=22%29 and highlight%28N%2B1=23%29
Verifying,
2%2822%29-23=44-23=21


Angles/345444: why wont a 3 legged chair wobble but a 4 legged chair will?
1 solutions

Answer 247113 by Fombitz(13828) About Me  on 2010-09-20 09:59:31 (Show Source):
You can put this solution on YOUR website!
Three points define a plane.
Once those three points are established adding another point, that isn't in the plane, would cause an unbalance, leading to the wobble.
If the 4th point is in the plane, then it wouldn't wobble either.


Volume/345448: The volume B of a box with a square base of side x and height 2x.
1 solutions

Answer 247111 by Fombitz(13828) About Me  on 2010-09-20 09:57:08 (Show Source):
You can put this solution on YOUR website!
The volume is,
V=x%2Ax%2A2x
V=2x%5E3


Rectangles/345525: what is the perimeter for a rectangle with a length of 3/2 and a width of 11/4
1 solutions

Answer 247110 by Fombitz(13828) About Me  on 2010-09-20 09:56:23 (Show Source):
You can put this solution on YOUR website!
P=2L%2B2W
P=2%283%2F2%29%2B2%2811%2F4%29
Complete the calculation to get the final answer.


Rational-functions/345457: Multiply
(s+t)(s^2-st+t^2)
Thank you
1 solutions

Answer 247109 by Fombitz(13828) About Me  on 2010-09-20 09:55:34 (Show Source):
You can put this solution on YOUR website!
%28s%2Bt%29%28s%5E2-st%2Bt%5E2%29=s%28s%5E2-st%2Bt%5E2%29%2Bt%28s%5E2-st%2Bt%5E2%29
%28s%2Bt%29%28s%5E2-st%2Bt%5E2%29=%28s%5E3-s%5E2t%2Bst%5E2%29%2B%28s%5E2t-st%5E2%2Bt%5E3%29
Take it from there, combine like terms, and come up with the final answer.


Sequences-and-series/345515:
1 solutions

Answer 247108 by Fombitz(13828) About Me  on 2010-09-20 09:52:47 (Show Source):
You can put this solution on YOUR website!
Please re-post.


Functions/345442: does x+8=y^2 define y as a function of x?
1 solutions

Answer 247107 by Fombitz(13828) About Me  on 2010-09-20 09:52:06 (Show Source):
You can put this solution on YOUR website!
No, there are two values of y for each value of x, violating the requirements for a function.
As an example, x=8,
8%2B8=y%5E2
y%5E2=16
y=4 and y=-4.


Distributive-associative-commutative-properties/345521: A company buy a $450,000 piece of equiptment in 2005. It depreciates $33,000 a year. What is the equation that relates years and value? For 10 years?
1 solutions

Answer 247105 by Fombitz(13828) About Me  on 2010-09-20 09:48:11 (Show Source):
You can put this solution on YOUR website!
At time, t=0 (2005), the equipment is worth $450,000.
It loses $33,000 of value every year after 2005.
V%28t%29=450000-33000t where t is the number of years since 2005.
In 10 years,
V%2810%29=450000-33000%2810%29
V%2810%29=450000-330000
V%2810%29=120000
The equipment is worth $120,000 in 10 years.


Exponential-and-logarithmic-functions/345484: Please help me solve this equation write this in radical form 81 1/2 thank you :)
1 solutions

Answer 247103 by Fombitz(13828) About Me  on 2010-09-20 09:45:33 (Show Source):


Travel_Word_Problems/345517: A car enters the freeway traveling at 60 miles per hour. A second car enters the freeway 11 minutes later traveling at 65 miles per hour. How long will it take for the second car to catch up to the first car?
1 solutions

Answer 247102 by Fombitz(13828) About Me  on 2010-09-20 09:44:11 (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
R%2At=D
.
.
.
Convert 11 minutes to hours.
11%281%2F60%29=11%2F60 hours
In the 11 minutes, the first car moves,
D=60%2811%2F60%29=11miles
The distance traveled by the first car is,
D%5B1%5D=60t%2B11
The distance traveled by the second car is,
D%5B2%5D=65t
.
.
.
Find t when D%5B1%5D=D%5B2%5D
60t%2B11=65t
5t=11
highlight%28t=11%2F5%29hr


Surface-area/345518: if a rectangle measures 3m by 2m calculate its area and include the unit in ur calculation

1 solutions

Answer 247101 by Fombitz(13828) About Me  on 2010-09-20 09:42:42 (Show Source):
You can put this solution on YOUR website!
For a rectangle,
A=L%2AW
A=%283%2A2%29m%5E2
Complete the calculation for the final answer.


Triangles/345491: Two vertices of a triangle are (0,6) and (4,0), and the medians intersect at (0,2). Find the third vertex of the triangle.
1 solutions

Answer 247100 by Fombitz(13828) About Me  on 2010-09-20 09:36:12 (Show Source):
You can put this solution on YOUR website!
A:(0,6)
B:(4,0)
C:(x,y)
Assume that the final vertex is located at(x,y).
Then the median connecting (x,y) to the midpoint of AB, located at (2,3), has a slope,since it also goes through (0,2), of,
m=%283-2%29%2F%282-0%29=1%2F2
and a y-intercept of 2.
1.y=%281%2F2%29x%2B2
.
.
.
The median connecting (4,0),(0,2), and the midpoint of AC has a slope of,
m=%282-0%29%2F%280-4%29=-1%2F2
and a y-intercept of 2.
y=-%281%2F2%29x%2B2
The midpoint of AC is (%28x%2B0%29%2F2,%28y%2B6%29%2F2) or (x%2F2,y%2F2%2B3).
It also satisfies the line,
y=-%281%2F2%29x%2B2
y%2F2%2B3=-%281%2F2%29%28x%2F2%29%2B2
2y%2B12=-x%2B8
2.x%2B2y=-4
.
.
.
From eq. 1,
2y=x%2B4
Substituting into eq. 2,
x%2Bx%2B4=-4
2x=-8
highlight%28x=-4%29
Then
2y=-4%2B4
2y=0
highlight%28y=0%29
The final vertex is located at (-4,0)


Systems-of-equations/345504: Simplify. You may use the properties to help: (3x)(4y)(2z)
1 solutions

Answer 247092 by Fombitz(13828) About Me  on 2010-09-20 08:56:37 (Show Source):


test/345494: If x is a real number, then show that 0<(1/x^2+6x+10)≤1.
1 solutions

Answer 247091 by Fombitz(13828) About Me  on 2010-09-20 08:55:48 (Show Source):
You can put this solution on YOUR website!
In order for 1%2F%28x%5E2%2B6x%2B10%29%3C=1, then x%5E2%2B6x%2B10%3E=1 for all x.
Convert to vertex form by completing the square, y=a%28x-h%29%5E2%2Bk where (h,k) is the vertex.
f%28x%29=x%5E2%2B6x%2B10
f%28x%29=%28x%5E2%2B6x%2B9%29%2B10-9
f%28x%29=%28x%2B3%29%5E2%2B1
Since the coefficient of x%5E2 is positive, the parabola opens upwards and the value at the vertex is the function minimum.
(h,k)=(-3,1)
Since the function value is never less than 1, then the inverse of the function value is never greater than 1.


Word_Problems_With_Coins/345503: Make 64 cents using 8 coins

1 solutions

Answer 247090 by Fombitz(13828) About Me  on 2010-09-20 08:47:35 (Show Source):
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You need 4 pennies.
That leaves 60 cents and 4 coins left.
2 quarters and 2 nickels equal 60 cents and use 4 coins.


Graphs/345419: let f(x)=-1/2x^2+2x+3
find and graph:
a) the x-coordinate of vertex
b) the y-coordinate of vertex
c) the axis of symmetry
d) the max/min value of f and which value it is
e) the x value that gives max/min value of f
1 solutions

Answer 247089 by Fombitz(13828) About Me  on 2010-09-20 08:46:04 (Show Source):
You can put this solution on YOUR website!
f%28x%29=-%281%2F2%29x%5E2%2B2x%2B3
Complete the square to put the function into vertex form, y=a%28x-h%29%5E2%2Bk where (h,k) is the vertex.
f%28x%29=-%281%2F2%29%28x%5E2-4x%29%2B3
f%28x%29=-%281%2F2%29%28x%5E2-4x%2B4%29%2B3%2B4%2F2
f%28x%29=-%281%2F2%29%28x-2%29%5E2%2B5
a) h=2
b) k=5
c) The vertex lies on the axis of symmetry, x=2
d) k=5 since the coefficient of x%5E2 is negative the parabola opens downward and the value at the vertex is a maximum.
ymax=5
e) h=2
.
.
.


test/345502: How do you factor polynomial 16x^2+49Y^2
1 solutions

Answer 247087 by Fombitz(13828) About Me  on 2010-09-20 08:40:36 (Show Source):


Linear_Equations_And_Systems_Word_Problems/345384: An elephant herd is moving at a rate of 6 mph. a stray ran at 10mph and caught up in five minutes. How long(in hours) did the stray run to catch up and how far did it run?

1 solutions

Answer 247081 by Fombitz(13828) About Me  on 2010-09-20 07:59:39 (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
.
.
.
5 minutes=5%2F60=1%2F12 hour
So the stray ran (1%2F12) hour.
.
.
.

.
.
HX is the distance that the herd moved.
In 5 minutes, the herd moved,
HX=6%281%2F12%29=1%2F2mile
.
.
SX is the distance that the stray moved.
In 5 minutes, the stray moved,
SX=10%281%2F12%29
SX=10%2F12=5%2F6
.
.
SH is the distance they were intially separated.
.
.
SH%2BHX=SX
SH%2B1%2F2=5%2F6
SH=5%2F6-3%2F6
SH=2%2F6=1%2F3 mile


Length-and-distance/345492: A segment has end points (4,-2) and (13,13). Find the coordinates of the points that trisect the segment.
1 solutions

Answer 247080 by Fombitz(13828) About Me  on 2010-09-20 07:38:38 (Show Source):
You can put this solution on YOUR website!
Calculate the difference in x values.
x2-x1=13-4=9
Trisect the difference or divide it in 3.
DELTA%2Ax=9%2F3=3
.
.
.
Calculate the difference in y values.
y2-y1=13-%28-2%29=15
Divide it in 3.
DELTA%2Ay=15%2F3=5
.
.
.
Starting at (4,-2) add (3,5)
(4,-2)+(3,5)=(7,3)
Starting at (7,3), add (3,5)
(7,3)+(3,5)=(10,8)
Finally one more time should get us to the second given point.
(10,8)+(3,5)=(13,13)
Verifying that the method was proper.
(7,3) and (10,8) are the two points.
.
.
.


Rational-functions/345493: Does the equation y^2=16x define y as a function of x?
1 solutions

Answer 247079 by Fombitz(13828) About Me  on 2010-09-20 07:30:55 (Show Source):
You can put this solution on YOUR website!
y%5E2=16x+
y=0+%2B-+sqrt%2816x%29
y=0+%2B-+4sqrt%28x%29
However, y is not a proper function.
By definition, a function provide a unique y value for each x value.
This relation provides two y value for each x value.


Angles/345375: the ratio of the measure of the complement of angle G to the measure of the supplement of the complement of angle G is 1:4
find the ratio of the measure of angle G to the supplement og angle G
use algebra to show your work
1 solutions

Answer 247077 by Fombitz(13828) About Me  on 2010-09-20 07:28:08 (Show Source):
You can put this solution on YOUR website!
1.G%2BC=90
2.G%2BS=180
.
.
.
C%2FS=1%2F4
3.S=4C
Subtracting eq. 1 from eq. 2,
G%2BS-G-C=180-90
S-C=90
Substitute from eq. 3,
4C-C=90
3C=90
highlight%28C=30%29degrees
.
.
S-30=90
highlight%28S=120%29degrees
.
.
G%2BS=180
highlight%28G=60%29degrees
.
.
.
highlight_green%28G%2FS=60%2F120=1%2F2%29


Expressions-with-variables/345467: (the original problem was solve the equation and use set equation to express solution sets for equations with no solution or equations that are true to all real numbers the equation was 2+3(2x-7)=9-4(3x+1) i solved for x and got x=4/3 how would i use set notation to express solution set x=4/3 i belive the answer to be {x|x=4/3}
1 solutions

Answer 247076 by Fombitz(13828) About Me  on 2010-09-20 07:24:39 (Show Source):
You can put this solution on YOUR website!
Yes, your answer is correct and that use of set builder seems appropriate.
Well done!


Age_Word_Problems/345470: Paula is 12 years older than her brother Bob. Four years from now Bob wil be two thirds as old as Paula. How old are they now?
1 solutions

Answer 247073 by Fombitz(13828) About Me  on 2010-09-20 07:22:19 (Show Source):
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1.P=B%2B12
.
.
.
In 4 years, Paula will be P+4, Bob will be B+4.
B%2B4=%282%2F3%29%28P%2B4%29
Multiply by 3.
3%28B%2B4%29=2%28P%2B4%29
3B%2B12=2P%2B8
3B%2B4=2P
Substitute from eq. 1,
3B%2B4=2%28B%2B12%29
3B%2B4=2B%2B24
B=20
Then,
P=20%2B12
P=32
Paula is 32, Bob is 20.


Angles/345478: ∠A and ∠B are supplementary. Find ∠A and ∠B.
m∠A=3x-7
m∠B=11-1
1 solutions

Answer 247072 by Fombitz(13828) About Me  on 2010-09-20 07:19:22 (Show Source):
You can put this solution on YOUR website!
By definition,
A%2BB=180
Substitute,
3x-7%2B11-1=180
3x%2B3=180
3x=177
x=59degrees
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.
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A=3%2859%29-7
A=170degrees
B=10degrees


Exponents/345487: Hi there!
Is there anybody out there willing to help me?
(X^4 * 10^-3 * 5 * 10^11)/(x^-3 * 3 * 10^2 * 20 * 10^-3)
1 solutions

Answer 247070 by Fombitz(13828) About Me  on 2010-09-20 07:16:39 (Show Source):


Pythagorean-theorem/345158: these numbers are on a right triangle. the hypotenuse is 2x+6 , the side is x , and the bottom is 2x+4 . i have to solve for x .
1 solutions

Answer 247034 by Fombitz(13828) About Me  on 2010-09-19 23:22:13 (Show Source):
You can put this solution on YOUR website!
Use the Pythagorean theorem,
x%5E2%2B%282x%2B4%29%5E2=%282x%2B6%29%5E2
x%5E2%2B%284x%5E2%2B16x%2B16%29=4x%5E2%2B24x%2B36}
5x%5E2%2B16x%2B16=4x%5E2%2B24x%2B36}
x%5E2-8x-20=0
%28x-10%29%28x%2B2%29=0
Two solutions but only the positive solution makes sense here.
x-10=0
highlight%28x=10%29
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.
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(10,24,26)


Rational-functions/345235: Factor completely
12r^2+36rp+27p^2
Thank you
1 solutions

Answer 247032 by Fombitz(13828) About Me  on 2010-09-19 23:18:26 (Show Source):


Equations/345374: A theater owner want to divide an 1800 seat theatre in 3 sections. With tickets costing 20, 35, and 50. He wants to have twice as many 20 dollar tickets as the sum of the other tickets and he wants to earn 48,000 from a full house. To find out how many seats in each section, solve the equations.
x+y+z=1800
x=2(y+z)
20x+35y+50z=48,000
1 solutions

Answer 247030 by Fombitz(13828) About Me  on 2010-09-19 23:14:31 (Show Source):
You can put this solution on YOUR website!
Substitute x=2%28y%2Bz%29 into eq. 1 and eq. 2,
1.x%2By%2Bz=1800
1.2y%2B2z%2By%2Bz=1800
1.3y%2B3z=1800
1.y%2Bz=600
.
.
.
2.20x%2B35y%2B50z=48000
2.40y%2B40z%2B35y%2B50z=48000
2.75y%2B90z=48000
2.5y%2B6z=3200
From eq. 1,
y=600-z
Substitute into eq. 2,
5%28600-z%29%2B6z=3200
3000-5z%2B6z=3200
highlight%28z=200%29
Then,
y=600-200
highlight%28y=400%29
And finally,
x=2%28y%2Bz%29
x=2%28400%2B200%29
highlight%28x=1200%29


Linear-equations/345427: Give the slope and -intercept for the graph of the function f(x)23-5x/6
1 solutions

Answer 247027 by Fombitz(13828) About Me  on 2010-09-19 23:06:22 (Show Source):
You can put this solution on YOUR website!
Compare to the slope-intercept form, y=mx%2Bb where m is the slope and b is the intercept.
Comparing,
m=-5%2F6
b=23