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Linear-equations/741262: please help me to solve this question
what is the slope of 4x-2y=0 ?
1 solutions

Answer 451934 by Alan3354(30993) About Me  on 2013-04-24 10:05:21 (Show Source):
You can put this solution on YOUR website!
what is the slope of 4x-2y=0 ?
------------
Solve for y.
then the slope is the coefficient of x


Quadratic-relations-and-conic-sections/741209: Write the binomial expansion of the expression:
(4x+2)^4
A)(16x^2+8x+4)^4
B)512x^4+1024x^3+384x^2+256x+16
C)256x^4+512x^3+324x^2+128x+16
D)256x^3+512x^2+384x+128
1 solutions

Answer 451926 by Alan3354(30993) About Me  on 2013-04-24 09:23:05 (Show Source):
You can put this solution on YOUR website!
Write the binomial expansion of the expression:
(4x+2)^4
A)(16x^2+8x+4)^4
B)512x^4+1024x^3+384x^2+256x+16
C)256x^4+512x^3+324x^2+128x+16
D)256x^3+512x^2+384x+128
-------------------------------
Just check the 1st term.


Triangles/741250: in a 30-60-90 triangle, the length of the hypotenuse is 30. what is the length of the longer leg?
1 solutions

Answer 451925 by Alan3354(30993) About Me  on 2013-04-24 09:20:40 (Show Source):
You can put this solution on YOUR website!
in a 30-60-90 triangle, the length of the hypotenuse is 30. what is the length of the longer leg?
----------
s = 30*sin(60)


Travel_Word_Problems/741249: a person runs 42.195 km in 2:23:07. find out the 3 different distances.
1 solutions

Answer 451924 by Alan3354(30993) About Me  on 2013-04-24 09:19:35 (Show Source):
You can put this solution on YOUR website!
a person runs 42.195 km in 2:23:07. find out the 3 different distances.
------------
What 3?
Only 1 distance is mentioned.


Travel_Word_Problems/741253: How long will it take a car travelling at 60mph to arrive at a distance 400miles away?
1 solutions

Answer 451923 by Alan3354(30993) About Me  on 2013-04-24 09:18:16 (Show Source):
You can put this solution on YOUR website!
How long will it take a car travelling at 60mph to arrive at a distance 400miles away?
---------------------
d = r*t
t = d/r


Rate-of-work-word-problems/741238: Hey.. please help with this! It takes 48 hours to fill a swimming pool with water using 3 identical water pumps.
A) how long would it take to fill the pool if there were 8 of these pumps?
B) how many pumps would be needed to fill the pool in 12 hours?
Thanks:)
1 solutions

Answer 451912 by Alan3354(30993) About Me  on 2013-04-24 07:34:43 (Show Source):
You can put this solution on YOUR website!
It takes 48 hours to fill a swimming pool with water using 3 identical water pumps.
A) how long would it take to fill the pool if there were 8 of these pumps?
Filling the pool takes 48*3 = 144 pump-hours
144 pump-hrs/8 pumps = 18 hours
------------------
B) how many pumps would be needed to fill the pool in 12 hours?
144 pump-hrs/12 hrs = 12 pumps
===================
Notice how the units cancel. Including the units can help avoid errors.


Trigonometry-basics/741105: A plane flies on a bearing of 230o at 350 miles per hour. A wind is blowing from the west at 30 miles per hour. Find the groundspeed and the final bearing of the plane in the wind.

1 solutions

Answer 451848 by Alan3354(30993) About Me  on 2013-04-23 20:36:15 (Show Source):
You can put this solution on YOUR website!
A plane flies on a bearing of 230o at 350 miles per hour. A wind is blowing from the west at 30 miles per hour. Find the groundspeed and the final bearing of the plane in the wind.
-----------------
2 sides of the triangle are 350 & 30.
The angle between the 2 sides = 270 - 230 = 40 degs
GS+=+sqrt%28350%5E2+%2B+30%5E3+-+2%2A350%2A30%2Acos%2840%29%29
GS =~ 327.586 mi/hr
-------------
angle A is between heading and ground track
GS/sin(40) = 30/sin(A)
A =~ 3.375 degs
----
ground track = 230 - A = 226.6 degs


Miscellaneous_Word_Problems/741108: You pour 2 gallons of 5% bleach into 3 gallons of 20% bleach.What is the percentage in this new mixture?

(Hint: 3x3 chart may be helpful)
1 solutions

Answer 451842 by Alan3354(30993) About Me  on 2013-04-23 20:27:16 (Show Source):
You can put this solution on YOUR website!
You pour 2 gallons of 5% bleach into 3 gallons of 20% bleach.What is the percentage in this new mixture?
----------
2*5 + 3*20 = 5*C
5C = 70
C = 14% concentration


decimal-numbers/740967: OK, THIS IS MY SECOND TIME ASKING THIS QUESTION TO YOU TUTORS!!! NOBODY STILL HASN'T HELPED ME WITH THIS PROBLEM!!! SERIOUSLY, I NEED HELP!!! I DON'T HAVE ANY MONEY TO DOWNLOAD OTHER ONLINE TUTORIALS!!
Four students are about to purchase concert tickets for $18.50. For each ticket, they discovered that they may purchase a block of 5 tickets for $80.00. How much would each of the 4 save if they can get a fifth person to join them and the 5 people equally divide the price of the 5-ticket block? WHAT IS THE ANSWER?!
1 solutions

Answer 451823 by Alan3354(30993) About Me  on 2013-04-23 18:23:50 (Show Source):
You can put this solution on YOUR website!
wow, you had to enter it 2 times?
What makes you think we're obligated to do anything for you?
What effort did you make? I'm guessing none, just whining.


Exponential-and-logarithmic-functions/740977: 2(upper arrow)3=8
rewrite
?

1 solutions

Answer 451815 by Alan3354(30993) About Me  on 2013-04-23 17:47:53 (Show Source):
You can put this solution on YOUR website!
2(upper arrow)3=8
rewrite
?
------------
2%5E3+=+8


Surface-area/741004: A family room is 24 feet5long and 18feet wide ,wshat is the area of the family room
1 solutions

Answer 451814 by Alan3354(30993) About Me  on 2013-04-23 17:46:10 (Show Source):
You can put this solution on YOUR website!
A family room is 24 feet5long and 18feet wide ,wshat is the area of the family room
----------
Area = length * width


test/740975: 19. Consider two ships, one on a course described by the equation 0.6x + 0.3y = 2.1 and the other on a course described by the equation –0.3x + 0.1y = –1.8. Which of the following sentences best describes the possibility of a collision?
A. There will certainty be a collision at the point (6, 0).
B. There is a possibility of a collision at the point (0, 7) but a collision is not a certainty. C. There is no possibility for a collision.
D. There is a possibility of a collision at the point (5, –3) but a collision is not a certainty.
1 solutions

Answer 451811 by Alan3354(30993) About Me  on 2013-04-23 17:40:09 (Show Source):
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19. Consider two ships, one on a course described by the equation 0.6x + 0.3y = 2.1 and the other on a course described by the equation –0.3x + 0.1y = –1.8. Which of the following sentences best describes the possibility of a collision?
A. There will certainty be a collision at the point (6, 0).
B. There is a possibility of a collision at the point (0, 7) but a collision is not a certainty. C. There is no possibility for a collision.
D. There is a possibility of a collision at the point (5, –3) but a collision is not a certainty.
------------------------
Find the intersection of the lines of the equations, if any.
0.6x + 0.3y = 2.1 x10/3 --> 2x + y = 7
–0.3x + 0.1y = –1.8 x10 --> -3x + y = -18
-------------------
2x + y = 7
-3x +y = -18
--------------- Subtract
5x = 25
x = 5
-------
y = -3
--> intersection at (5,-3)
Both ships would cross the point (5,-3) but not necessarily at the same time.


test/740968: 10. Which of the following phrases correctly describes the graph of the system of equations
and y = 2 − x?
A. The graph is of two lines that coincide.
B. The graph is of a line and a parabola, which intersect at two points. C. The graph is of two parallel lines that do not intersect.
D. The graph is of two lines that intersect at a single point.

1 solutions

Answer 451800 by Alan3354(30993) About Me  on 2013-04-23 16:16:26 (Show Source):
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10. Which of the following phrases correctly describes the graph of the system of equations
and y = 2 − x?
A. The graph is of two lines that coincide.
B. The graph is of a line and a parabola, which intersect at two points. C. The graph is of two parallel lines that do not intersect.
D. The graph is of two lines that intersect at a single point.
----------------
I see only 1 equation.


Expressions-with-variables/740964: I can't figure out the answer to:
x+y=11
x+y=-5
1 solutions

Answer 451799 by Alan3354(30993) About Me  on 2013-04-23 16:11:26 (Show Source):
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I can't figure out the answer to:
x+y=11
x+y=-5
------------
The left sides are the same.
They can't equal both 11 & -5
--> no solution


Percentage-and-ratio-word-problems/740945: men and women are in a ratio P:Q . What is the percentage of men ?

1 solutions

Answer 451797 by Alan3354(30993) About Me  on 2013-04-23 15:30:05 (Show Source):
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men and women are in a ratio P:Q . What is the percentage of men ?
----------
100*P/(P+Q)


Graphs/740937: how to solve y=4x-3
-4x+y=9
1 solutions

Answer 451796 by Alan3354(30993) About Me  on 2013-04-23 15:18:18 (Show Source):
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how to solve y=4x-3
-4x+y=9
----------------
Solve both equations for y.


Graphs/740934: how to solve 3x+4y=-36
-2x=4y=-16
1 solutions

Answer 451795 by Alan3354(30993) About Me  on 2013-04-23 15:03:04 (Show Source):
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how to solve 3x+4y=-36
-2x=4y=-16 **** too many equal signs


Graphs/740936: how to solve y=x+8
-x+y=8
1 solutions

Answer 451794 by Alan3354(30993) About Me  on 2013-04-23 14:58:25 (Show Source):
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how to solve y=x+8
-x+y=8
--------------
That's the same equation twice.
--> dependent, infinite # of solutions.
No unique solution.


Linear-systems/740917: 8x-13y+4=0 put in slope intercept form

1 solutions

Answer 451793 by Alan3354(30993) About Me  on 2013-04-23 14:42:05 (Show Source):
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8x-13y+4=0 put in slope intercept form
---------------
Solve for y.


Matrices-and-determiminant/740918: determinant of 1 2 2 1
1 2 4 2
2 7 5 2
-1 4 -6 3

1 solutions

Answer 451788 by Alan3354(30993) About Me  on 2013-04-23 14:10:42 (Show Source):
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determinant of 1 2 2 1
1 2 4 2
2 7 5 2
-1 4 -6 3
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Det = -42


Polygons/740789: a = 33, b = 11, c =
1 solutions

Answer 451786 by Alan3354(30993) About Me  on 2013-04-23 14:05:01 (Show Source):
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a = 33, b = 11, c =
------------------
How is c related to a & b?


expressions/740782: Nine years more than twice Bob's age is 5 years more than three times Harry's age. Find their ages.
1 solutions

Answer 451785 by Alan3354(30993) About Me  on 2013-04-23 14:04:07 (Show Source):
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Nine years more than twice Bob's age is 5 years more than three times Harry's age. Find their ages.
--------------------
9 + 2*Bob = 5 + 3*Harry
2B + 4 = 3H
If you assume only positive integer solutions,
Bob is 1, Harry is 2
Bob is 4, Harry is 4
Bob is 7, Harry is 6
etc
Bob's age = 3n+1, n = 0,1,2,3...
Harry's age = (2B + 4)/3


Polygons/740778: I have no clue as to how to answer this question! please help!
If the sum of the measures of the interior angles of a convex n-gon is equal to the sum of the measures of the exterior angles, how many sides does the n-gon have?
1 solutions

Answer 451782 by Alan3354(30993) About Me  on 2013-04-23 13:54:22 (Show Source):
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If the sum of the measures of the interior angles of a convex n-gon is equal to the sum of the measures of the exterior angles, how many sides does the n-gon have?
----------------
The sum of exterior angles is always 360 degs, for all polygons.
--> what polygon has a sum of 360 degs for interior angles?


Geometry_Word_Problems/740787: The two sides of a square pen each measure 3√2 m. What is the diagonal measure?
1 solutions

Answer 451781 by Alan3354(30993) About Me  on 2013-04-23 13:50:49 (Show Source):
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The two sides of a square pen each measure 3√2 m. What is the diagonal measure?
-------------------
d%5E2+=+s%5E2+%2B+s%5E2


logarithm/740799: 1.how do i evaluate log 37.5? 2. How do i evaluate log 0.72, question 3. solve the inequality, 10x+1/5-8x+4/6 < less than or equal to 2x-7.
1 solutions

Answer 451780 by Alan3354(30993) About Me  on 2013-04-23 13:49:13 (Show Source):
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1.how do i evaluate log 37.5?
log(37.5) =~ 1.57403 (using a calculator)
---------------
2. How do i evaluate log 0.72
Same as #1
-----------
3. solve the inequality, 10x+1/5-8x+4/6 < less than or equal to 2x-7.
10x+1/5-8x+4/6 <= 2x-7
If you mean
(10x+1)/5 - (8x+4)/6 <= 2x-7
Multiply by 30 to eliminate fractions
6(10x+1) - 5(8x+4) <= 60x - 210
20x - 14 <= 60x - 210
196 <= 40x
40x >= 196
x >= 4.9


Money_Word_Problems/740866: At 4.75 percent interest, how long does it take to quadruple your money?
At 4.75 percent interest, how long does it take to double your money?
1 solutions

Answer 451778 by Alan3354(30993) About Me  on 2013-04-23 13:43:16 (Show Source):
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At 4.75 percent interest, how long does it take to quadruple your money?
At 4.75 percent interest, how long does it take to double your money?
-----------------
You didn't give the compounding period, if any.
Compounded annualy:
2*Amt = Amt*1.0475^t (t in years)
1.0475^t = 2
t*log(1.0475) = log(2)
t = log(2)/log(1.0475)
t =~ 14.936 years to double
-------------
Do the others the same way.


Surface-area/740892: how much will it cost to carpet a rectangular room measuring 10m by 25m, if carpeting cost $24.65 per square meter?
1 solutions

Answer 451777 by Alan3354(30993) About Me  on 2013-04-23 13:39:20 (Show Source):
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how much will it cost to carpet a rectangular room measuring 10m by 25m, if carpeting cost $24.65 per square meter?
--------------------
Area = 250 sq m
Cost = 250*$24.65
Cost = $6162.50


Travel_Word_Problems/740844: how long would it take a cyclist to travel 45km at an average speed of 84km/hr
1 solutions

Answer 451719 by Alan3354(30993) About Me  on 2013-04-23 10:25:16 (Show Source):
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how long would it take a cyclist to travel 45km at an average speed of 84km/hr
------------
d = r*t
t = d/r


Exponential-and-logarithmic-functions/740806: solve logx^2=2 for all values of x
1 solutions

Answer 451697 by Alan3354(30993) About Me  on 2013-04-23 09:17:35 (Show Source):
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solve logx^2=2 for all values of x
------------
log(x^2) = 2
x^2 = 100
x = -10, 10


Rectangles/740822: how many cars can you park in a rectangle field 1400 x 500 and 850 x 300
1 solutions

Answer 451696 by Alan3354(30993) About Me  on 2013-04-23 09:16:04 (Show Source):
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how many cars can you park in a rectangle field 1400 x 500 and 850 x 300
--------------
How much space per car, and shape of the spaces?
How much for lanes between cars?


Systems-of-equations/740718: -3y = 7y
1 solutions

Answer 451692 by Alan3354(30993) About Me  on 2013-04-23 08:34:35 (Show Source):
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-3y = 7y
0 = 10y
y = 0