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Alan3354 answered: 30925 problems
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Volume/480111: I have a cylinder with a 2.5 cm radius and a 6cm height . What is the total area of this cylinder?
1 solutions

Answer 328862 by Alan3354(30945) About Me  on 2011-08-10 11:20:26 (Show Source):
You can put this solution on YOUR website!
I have a cylinder with a 2.5 cm radius and a 6cm height . What is the total area of this cylinder?
------------
Lateral area (the curved part) = 2*pi*r*h
Top and bottom area = pi%2Ar%5E2 each


Graphs/480085: i need help with graphing 6x-2y=0
1 solutions

Answer 328861 by Alan3354(30945) About Me  on 2011-08-10 11:17:50 (Show Source):
You can put this solution on YOUR website!
i need help with graphing 6x-2y=0
---------
y = 3x
It's a straight line, so you need 2 points
Pick 2 for x and find y.
Plot the 2 points.
Draw a line thru them.


Systems-of-equations/480091: Find the slope-intercept form, standard form and point slope form of the equation of the line
described

A line with y-intercept of (0, -3) and x-intercept of (-5, 0)
1 solutions

Answer 328855 by Alan3354(30945) About Me  on 2011-08-10 10:28:36 (Show Source):
You can put this solution on YOUR website!
Find the slope-intercept form, standard form and point slope form of the equation of the line
described

A line with y-intercept of (0, -3) and x-intercept of (-5, 0)
------------------
If the y-int is (0,A) and the x-int is (B,0), the eqn is
Ax + By + AB = 0
------------
-3x - 5y + 15 = 0
3x + 5y = 15 standard form
----------
y = (-3/5)x + 3 slope-intercept form
--------------------------------
You can do it like this, too
Find the slope, m = diffy/diffx = 3/-5 = -3/5
Use y = mx + b and either point to find b (we'll pretend we don't know it)
-3 = (-3/5)*0 + b
b = -3
--> y = (-3/5)x - 3 slope-int form
3x + 5y = 15


Graphs/480074: find the slope if it exist y=-2.79x
1 solutions

Answer 328845 by Alan3354(30945) About Me  on 2011-08-10 09:41:16 (Show Source):


Linear_Equations_And_Systems_Word_Problems/480060: Find the slope, if it exist, of the line containing the points (-1,1/2) and (-2,1/2).
1 solutions

Answer 328843 by Alan3354(30945) About Me  on 2011-08-10 09:15:49 (Show Source):
You can put this solution on YOUR website!
There's on change in y, so slope = 0.


Evaluation_Word_Problems/480031: The circle passes through the points (0,3),(2,4),(1,0). Find the equation of the circle

1 solutions

Answer 328842 by Alan3354(30945) About Me  on 2011-08-10 09:13:33 (Show Source):
You can put this solution on YOUR website!
One way to do this:
Label the points, say A, B and C
A(0,3)
B(2,4)
C(1,0)
-----------
Find the perpendicular bisectors of AB and BC (any 2)
Solve those 2 equations, the solution is the center of the circle, point P(x,y)
----------
Find the distance from P to A, B or C, that's the radius.
---------
Then %28x+-+Px%29%5E2+%2B+%28y-Py%29%5E2+=+r%5E2 Px and Py are x & y of point P.
-------------------
I prefer to use determinants, and I have an Excel sheet thst does them.


Rectangles/480018: hi um i just want to no what is the area of a square which has a perimeter of 92 meters if you no it please may i have the answer thanx alot.
1 solutions

Answer 328839 by Alan3354(30945) About Me  on 2011-08-10 08:57:29 (Show Source):
You can put this solution on YOUR website!
All 4 sides are equal length
s = 92/4
-----------
Area+=+s%5E2


test/479922: A line passes through (1,-5) and (-3,7) write an equation for the line in point - slope form
1 solutions

Answer 328808 by Alan3354(30945) About Me  on 2011-08-09 22:43:19 (Show Source):
You can put this solution on YOUR website!
A line passes through (1,-5) and (-3,7) write an equation for the line in point - slope form
-------------
m = diffy/diffx = 12/-4
m = -3
---------
y = mx + b
Use either point
-5 = -3 + b
b = -2
---------
y = -3x - 2


test/479959: The product of my 3 digit is 30. When you add my 1 digit and my 10 digit together the sum is my 100th digit. And my 1 digit is 3.
1 solutions

Answer 328806 by Alan3354(30945) About Me  on 2011-08-09 22:39:05 (Show Source):


Polynomials-and-rational-expressions/479942: Can you help me subtract 2x + 2w = 24 from -9 x + -2 w = -80 please thank you.

1 solutions

Answer 328805 by Alan3354(30945) About Me  on 2011-08-09 22:34:47 (Show Source):
You can put this solution on YOUR website!
-11x - 4w = -104


Probability-and-statistics/479918: How many ways can you add three different even numbers to get a sum of 20?

1 solutions

Answer 328804 by Alan3354(30945) About Me  on 2011-08-09 22:33:38 (Show Source):
You can put this solution on YOUR website!
An infinite number.
4, 6 & 10
2, 6 & 12
0, 6 & 14
-10, 8 & 12
-20, 0, 40
-300, 12, 308
etc


Rectangles/479967: what is the width of a rectangle with a perimeter of 70 feet if its lenght is 1 foot? 2 feet? l feet?
1 solutions

Answer 328803 by Alan3354(30945) About Me  on 2011-08-09 22:29:20 (Show Source):
You can put this solution on YOUR website!
what is the width of a rectangle with a perimeter of 70 feet if its lenght is 1 foot?
34 feet
---------
2 feet?
33 feet
-------
l feet?
35-L


Inequalities/479903: how do you solve -6x=24?
1 solutions

Answer 328802 by Alan3354(30945) About Me  on 2011-08-09 22:26:57 (Show Source):


Travel_Word_Problems/479894: if a car is going to 55mph how fast I must go to pass it whitin a 1/4 mile?
show me the work.
1 solutions

Answer 328801 by Alan3354(30945) About Me  on 2011-08-09 22:26:10 (Show Source):
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How far ahead is it?


test/479956: Your question goes here. Write clearly! We are not mind readers, so be sure to ask a question that we can understand.
1 solutions

Answer 328799 by Alan3354(30945) About Me  on 2011-08-09 22:24:59 (Show Source):


test/479963: Your question goes here. Write clearly! We are not mind readers, so be sure to ask a question that we can understand.
1 solutions

Answer 328798 by Alan3354(30945) About Me  on 2011-08-09 22:24:42 (Show Source):


Linear-systems/479829: i really need help on solving linear equations with elimination in non- standard form the equation is 2y=4x-16
5y=4x+8
Thanks for your help
1 solutions

Answer 328740 by Alan3354(30945) About Me  on 2011-08-09 16:38:31 (Show Source):
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2y=4x-16
5y=4x+8
----------- Subtract
-3y=-24
y = 8
------
5y=4x+8
5*8 = 4x + 8
4x + 8 = 40
x = 8
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Form doesn't matter, just look for the most direct way to solve them.


Mixture_Word_Problems/479810: 2m^3 of soil containing 35% sand was mixed into 6m^3 of soil containing 15% sand. What is the sand content of the mixture?
1 solutions

Answer 328737 by Alan3354(30945) About Me  on 2011-08-09 16:20:27 (Show Source):
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2m^3 of soil containing 35% sand was mixed into 6m^3 of soil containing 15% sand. What is the sand content of the mixture?
--------------
2*0.35 = 0.7 cm of sand
6*0.15 = 0.9 cm of sand
--------------------
--> 1.6 m^3 of sand in 8 m^3
1.6/8 = 0.2 = 20% sand


Evaluation_Word_Problems/479793: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
-3x + 6y = -3
-6x + 4y = -10

1 solutions

Answer 328732 by Alan3354(30945) About Me  on 2011-08-09 15:59:02 (Show Source):
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-3x + 6y = -3
-6x + 4y = -10
---------------
divide the 2nd eqn by 2, then subtract.
Solve for y.
Sub for y to solve for x.
Show your work.


Trigonometry-basics/479804: Factor the expresion and use the fundamental identities to simplify.
cos^2x+cos^2xtan^2x
1 solutions

Answer 328731 by Alan3354(30945) About Me  on 2011-08-09 15:54:45 (Show Source):
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Hint: tan = sin/cos


Linear-equations/479780: could you help me to solve the equation 6y−9=4x+9 for y?
I found that it has more than one answer, but the website doesn't accept.
Thank you.
1 solutions

Answer 328718 by Alan3354(30945) About Me  on 2011-08-09 15:21:15 (Show Source):
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6y - 9 = 4x + 9
6y = 4x + 18
y = (4x + 18)/6 = (2x + 9)/3
or y = (2/3)x + 3


Surface-area/479658: Two round fountains are similar. One measures 7'2" across and the other measures 12'1" across. Find the scale factor from the small one to the large one.
Thank you!
1 solutions

Answer 328716 by Alan3354(30945) About Me  on 2011-08-09 15:18:25 (Show Source):
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7'2 = 86 inches
12'1 = 145 inches
---------------
The factor for the diameter = 86/145


Travel_Word_Problems/479779: If I am drive 672 miles in 4 hours, what is my average spped? Can you please show formula?
1 solutions

Answer 328714 by Alan3354(30945) About Me  on 2011-08-09 15:16:29 (Show Source):
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d = r*t
distance = rate * time
-------------
672 = r*4
r = 168 mi/hr


Rate-of-work-word-problems/479775: paul can mow the grass in 50 minutes, but it takes Dan three timese longer. how long will it take them to mow the grass if they worked together?
1 solutions

Answer 328713 by Alan3354(30945) About Me  on 2011-08-09 15:14:26 (Show Source):
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paul can mow the grass in 50 minutes, but it takes Dan three timese longer. how long will it take them to mow the grass if they worked together?
------------------
Paul does 1/50 of the job per minute.
3 times longer is 150 minutes longer = 200 minutes
Dan does 1/200 per minute.
Together, they do 1/50 + 1/200 per minte = 1/40 per minute
--> 40 minutes


Rate-of-work-word-problems/479777: using one drain, a swimming pool can be emptied. using a different drain, the jov requires an hour and 15 minutes. how long will it take if both drains are opened?
1 solutions

Answer 328710 by Alan3354(30945) About Me  on 2011-08-09 15:11:56 (Show Source):
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Less than 1 hr 15 minutes, probably.


Angles/479660: Find the approximate value of the volume of the right circular cone, 12cm x 10cm with a circular base shown below. Approximate your solution to the nearest hundredth
1 solutions

Answer 328708 by Alan3354(30945) About Me  on 2011-08-09 15:07:19 (Show Source):
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Nothing is shown.
------------
Vol+=+pi%2Ar%5E2%2Ah%2F3 tho


Numbers_Word_Problems/479717: Find the largest of three consecutive even integers whose sum is less than 105
1 solutions

Answer 328698 by Alan3354(30945) About Me  on 2011-08-09 14:48:03 (Show Source):
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The sum will be even, so it will be divisible by 6.
The lowest x6 sum < 105 is 102.
102/3 = 34, the middle number
--> 32, 34 & 36


Geometry_Word_Problems/479655: A circular flower garden has a diameter of 18 ft. Around the garden there is a circular sidewalk which is 2 ft wide. What is the length around the outer edge of the sidewalk? (Hint: Make a drawing.)
1 solutions

Answer 328695 by Alan3354(30945) About Me  on 2011-08-09 14:26:52 (Show Source):
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Diameter of the walk = 18 + 2 + 2 (2 ft on each side)
Circumference+=+pi%2Ad+=+22pi


Angles/479755: In the circle below, angle a = 7x + 2 and angle b = 9x - 4. Find the value of x
1 solutions

Answer 328694 by Alan3354(30945) About Me  on 2011-08-09 14:23:29 (Show Source):
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No circle is shown.


Trigonometry-basics/479756: Solve the multiple-angle equation sin x/2=-sqrt3/2
So far I have 2x=sin^-1-sqrt3/2 with the answer x=0.433
1 solutions

Answer 328693 by Alan3354(30945) About Me  on 2011-08-09 14:19:13 (Show Source):
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sin%28x%2F2%29+=+-sqrt%283%29%2F2
x/2 = 240, 300 degs or 4pi/3, 5pi/3 radians
x = 8pi/3, 10pi/3 + 4*n*pi, n = 0,1,2,3...




Finance/479707: i need help with algebra i want to learn can you help me?
1 solutions

Answer 328691 by Alan3354(30945) About Me  on 2011-08-09 14:13:04 (Show Source):
You can put this solution on YOUR website!
Start by looking at the solved problems on this site.
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Some of the tutors here do tutoring for pay, too, so repost your request with whether or not you expect to make payment for assistance.