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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) 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.
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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) 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.
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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) 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 =~ 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
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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) 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.
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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) on 2013-04-23 17:40:09 (Show Source):
You can put this solution on YOUR website!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.
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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) on 2013-04-23 16:16:26 (Show Source):
You can put this solution on YOUR website!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.
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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) on 2013-04-23 14:04:07 (Show Source):
You can put this solution on YOUR website!Nine years more than twice Bob's age is 5 years more than three times Harry's age. Find their ages.
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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
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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) on 2013-04-23 13:54:22 (Show Source):
You can put this solution on YOUR website!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?
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The sum of exterior angles is always 360 degs, for all polygons.
--> what polygon has a sum of 360 degs for interior angles?
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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) on 2013-04-23 13:49:13 (Show Source):
You can put this solution on YOUR website!1.how do i evaluate log 37.5?
log(37.5) =~ 1.57403 (using a calculator)
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2. How do i evaluate log 0.72
Same as #1
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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
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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) on 2013-04-23 13:43:16 (Show Source):
You can put this solution on YOUR website!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?
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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
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Do the others the same way.
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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) on 2013-04-23 13:39:20 (Show Source):
You can put this solution on YOUR website!how much will it cost to carpet a rectangular room measuring 10m by 25m, if carpeting cost $24.65 per square meter?
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Area = 250 sq m
Cost = 250*$24.65
Cost = $6162.50
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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) on 2013-04-23 09:16:04 (Show Source):
You can put this solution on YOUR website!how many cars can you park in a rectangle field 1400 x 500 and 850 x 300
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How much space per car, and shape of the spaces?
How much for lanes between cars?
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