Tuesday
September 2, 2014

Posts by Knights


Total # Posts: 336

maths
prove what? that the whole thing equals 0 or something??
March 29, 2013

chemistry
2.4 x 10^-5 mol^2L^-2 at 25C
March 29, 2013

govenment
Henry's hostility to the government under the Constitution was so strong that he subsequently refused to join it, turning down offers to serve as United States Secretary of State and as a justice of the United States Supreme Court. -Wikipedia So, probably "c", Henry
March 28, 2013

algebra
What is the question, anna? Do we need to factor it?
March 28, 2013

Trigonometry question?
Thanks a lot, sorry I am not too good at trigonometry
March 28, 2013

Trigonometry question?
Let ABCD be a square, and let M and N be the midpoints of BC and CD respectively. Find sin<MAN.
March 28, 2013

Centroids and Triangles - determining perimeter?
Let G denote the centroid of triangle ABC. If triangle ABG is equilateral with side length 2, then determine the perimeter of triangle ABC. I drew the diagram, but it doesn't really help....
March 27, 2013

math
complete square: (x+2)^2+(y-1)^2 = 20 Then minus 2^2+1^2 = 5, so add 5 to the 20 we get (x+2)^2+(y-1)^2 = 25 sqrt 25 = 5 so, 5 is the radius the center is at (x+2)^2 = 0 (y-1)^2 = 0 so x = -2 y = 1 so the center is at (-2,1)
March 26, 2013

Bisectors in a Triangle
Let ABC have side lengths AB=13, AC=14, and BC=15. There are two circles located inside <BAC which are tangent to rays AB, AC , and segment BC. Compute the distance between the centers of these two circles.
March 26, 2013

Circles / Square
Alicia has a flat platter shaped like a square with a semicircle of diameter 10 inches on each edge. What is the number of inches in the side length of the smallest square that can contain the platter (which contains the square with the semicircles on each side of it)?
March 25, 2013

maths
gcf of 75 and 45 = 15
March 25, 2013

Please help with circle tangents geometry
Two circles of different sizes are tangent at T. A is on the smaller circle, whereas B is on the larger one. Also, segment CD is tangent to the smaller circle, and crosses the goes through the larger circle and hits the other side at D. TD is a diameter, and AB || CD. If the ...
March 24, 2013

Earth and Space Science
A galaxy is millions of light years away o.O
March 23, 2013

Math
-216.70 323.83 ________+ 107.13
March 23, 2013

Earth and Space Science
f, c, d, e, b, a
March 23, 2013

math
|900-700| unless it is |700-900| in which case it is still 200
March 23, 2013

algegra
2x^3 = 8x^3 2^3x = 8x 8x^3+8x or if you prefer, 8x(x^2+1)
March 23, 2013

math
We get 11 sqrt 3 - 3 so b)
March 23, 2013

math
x^2 - 9 Difference of squares (x+y)(x-y) = x^2-y^2 x^2 = x^2 y^2 = 3^2 So, we get (x+3)(x-3) as the answer.
March 23, 2013

Math
list out numbers for the y column, -3 -2 -1 0 1 2 3 For each row take the negative, so we get -3 3 -2 2 -1 1 0 0 1 -1 2 -2 3 -3
March 23, 2013

English
Adverb - A word that modifies a phrase, expressing a relation of place, time, circumstance, manner, cause, degree, etc Positive adverb - an adverb in its original state; not comparative or superlative. Unlike Comparative adverbs, Positive degree adverbs express the quality ...
March 22, 2013

Geometry
Good luck (and don't double post ;) )
March 21, 2013

Geometry
(180(n-2))/n is the formula for calculating the interior angle of a polygon, where n is the number of sides. so, 180 * 37 /39 = 170.769230769 about. the exterior angle is 180 - 170.769230769 = 9.23076923 about. Multiply that by the number of angles, 39, to get 9.23076923 * 39 ...
March 21, 2013

Geometry
The exterior angles of a polygon always add up to 360 degrees. Source - MathOpenRef
March 21, 2013

math
2 1/4 + 1 1/2= 2 1/4 + 1 2/4= 2+1 + (1/4+2/4) 3+3/4= 3 3/4 expressed as a improper fraction= 3*4 + 3 / 4 = 15/4 So the answer is 15/4, 3 3/4
March 21, 2013

Algebra
lw=40 3w-2 = l 3w-2(w) = 40 you could honestly guess and get l = 10, w = 4 but expanding the previous equation we get 3w^2-2w= 40 3w^2-2w-40=0 We factor to get (x-4)(3x+10) so, the width can be 4m, -10/3 m but since it cant be negative, it must be positive. plugging into the ...
March 21, 2013

math
type in graphing calculator in google . com and click on the url that resembles m y . hrw . c o m / m a t h 0 6 _ 0 7 / n s m e d i a / t o o l s / G raph _ Calculator / graph Calc . html
March 21, 2013

Opinion
The whole sentence is not an opinion, but he hopes to reschedule.... should be one.
March 21, 2013

Circle Geometry - chords in a circle
thanks
March 21, 2013

Circle Geometry - chords in a circle
Let PQ, RS , and TU be parallel chords of a circle. The distance between chords PQ and RS is 4, and the distance between chords RS and TU is also 4. If PQ = 78 TU=50 , then find RS. how to do this? Draw some lines?
March 21, 2013

Algebra
if you want to solve for it multiply btoh sides by 3 to get 2A = 24+12A 10 A = -24 A = -12/5
March 21, 2013

Math
Here is a good website for graphing functions and linear equations: my.hrw. com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html
March 21, 2013

CHEMISTRY
Hey man, not funny, don't curse him dude
March 21, 2013

algebra and geometry
you mean (6 sqrt 2 )/3? if so its already simplified to lowest terms if you meant 6 sqrt(2/3) then it is = sqrt(36*2/3) = sqrt 24 this is equivalent to 2 sqrt(6)
March 21, 2013

algebra and geometry
1) 152 / 152+48 = 152 / 200 = 19/25, or 76% 2) 4 for the first, multiplied by a-e = 5, so 20 3) 24*3*15 = 1080
March 21, 2013

geometry
area of cone = 1/3 r^2 (radius) * pi* height so, we get diameter = 2 radius, so radius = 4. so, 4^2 * pi = 16pi. Multiply this by 1/3 then by 9 to get 48 pi as the area of cone a. Cone b has a diamter of 12. so, the radius is 6, and r^2 = 36. then we get 36pi for the base and ...
March 21, 2013

Math
the best way to minimize perimeter but have most area is use a square. so, since square have same length on each side, we get 30/4 = 7.5 on each side. square that get your answer. 7.5 ^2 in your calculator is equal to 56.25
March 21, 2013

urgent urgent algebra
I am assuming you mean log _10 x = 4 in the equation. For this, log _x y = z, x^z = y So, x = 10^4 = 10,000 (a) (b) log _x 5 = 2, x^2 = 5, x = sqrt 5 (c) i guess you meant log 10_ 8 = x so 10^x = 8 plug this into calculator, "log 8" to get 0.903089987 etc... good luck
March 21, 2013

math
5 sides of the top cube is exposed. so we get 1*1 * 5 = 5 in ^2 the second cube has 4 sides exposed also, so 2^2 * 4 = 16 in ^2, but also it has one side with the cube on top, so we have 4-1 = 3 on that side, so the overall is 19 in ^2 Then we have for the third cube 5 sides ...
March 21, 2013

algebra URGENT HELP
Please do not repost several times
March 21, 2013

urgent urgent algebra / precalculas
ignoring e for this, because it seems like well maybe there was a typo? (a) 0.03% k = 1.4 3/100000 * k = 1.4 k = 46666 2/3 if you meant 3%, then we get 46 2/3 as k (b)R = 100 = kx 100 = kx 100 = 46 2/3 x => x = 2.142857143.... (or 100= 46666 2/3 x = 0.002142857....) (c) I ...
March 21, 2013

GEOMETRY
x+y+z = 198 xy = 2772 x^2+y^2 = z^2 Solve the equation for z
March 21, 2013

Geometry - Circles and tangents
Thanks a lot!!!
March 21, 2013

Geometry - Circles and tangents
Two circles of radius 1 are externally tangent at Q . Let PQ and QR be diameters of the two circles. From P a tangent is drawn to the circle with diameter QR , and from R a parallel tangent is drawn to the circle with diameter PQ . Find the distance between these two tangent ...
March 21, 2013

Algebra
Oh, right. You didn't give us a graph, but if you go to the website, or type in graphing calculator in google and click on the one which shows the url listed above, just type in the equation, and you should get the graph. Good luck! (By the way, the graph looks like a ...
March 21, 2013

Algebra
for graphing I mean. By the way, did you mean y = sqrt (2x+6) or y = sqrt (2x) + 6?
March 21, 2013

Algebra
my.hrw . com /math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html is a good website
March 21, 2013

math
convert to common denominator least commmon multiple of 5 and 25 is 25 so we want the fraction 3/5 to convert into the form x/25 so, 3/5 = x/25 we can cross multiply to get 5x = 25*3 x = 5*3 x= 15 So the fraction would be 15/25 Optional: adding 15/25 to 21/25 = 36/25 or 1 11/25
March 21, 2013

Art
1. quote from wikipedia, "...artists gathered at Barbizon ... making nature the subject of their paintings." So, false 2, another quote from wikipedia, "The brotherhood's early doctrines were expressed in four declarations: to have genuine ideas to express ...
March 21, 2013

Algebra: Please help
*Sorry for any inconveniences caused to you.
March 21, 2013

Algebra: Please help
woops Steve is right, I did not see the sqrt before the equation. So we get 16 = b^4/25 Simplifying we get 25*16 = 400 b^4 = 400 b^2 = 20 so, b^2 = sqrt 2^2 * 5 so, b = +/- 2 sqrt 5 answer is D Sorry for inconvenience
March 21, 2013

Algebra: Please help
we cross multiply or multiply both sides by 25 to get b^4 = 100 sqrt of both sides gives us sqrt b^4 = sqrt 100 = sqrt b^2 * b^2 = 10 b^2 = 10 b = +/- sqrt 10 which is roughly equal to +/- 3.1623...
March 21, 2013

maths
(I am assuming you meant express as a mixed number :D)
March 21, 2013

maths
what is the greatest multiple of 3 under 22? it is 21 (7*3) 22-21 = 1 So it is 7 1/3
March 21, 2013

Geometry - semicircle inside isosceles triangle
Thanks a lot!
March 21, 2013

Geometry - semicircle inside isosceles triangle
Isosceles triangle ABC has sides of length AB=AC=25 and BC=40 . Find the area of a semicircle inscribed in triangle ABC with diameter along BC . Please help I do not know how to start....
March 21, 2013

algebre
(1-0.038)^14 * 51200 = roughly 29766.03373..... So, since we cannot have 0.3373 customers, and because the question wants us to round, we get 29766 customers
March 21, 2013

Algebra Multiple Choice
1. From substitution we get 4-2x= -5x-2 So, 3x = -6, x=-2, so y = 8: (-2,8) 2. Should be D
March 21, 2013

Algebra-Multiple choice
1. Should be C (IF not, then B) 2. D, if you multiply 1st equation by 2, try subtracting the third equation, and you get 0 = 5 or 0 = -1 3. 2y = 4x 8x-4y=5 -4y = 5-8x 4y = 8x-5 2y = 4x - 5/2 When minus the first equation from this, we get 0 = -5/2 So, A.
March 21, 2013

MATH
1/4 * 2000 = 500
March 21, 2013

math
100+150 = 250 in all Each bubble = 50 cents 250 * 0.5 = 125 dollars. So it is equal to 125.00 Move the decimal point to the right one place
March 20, 2013

analytic geometry/graphing problem
thanks a lot
March 19, 2013

analytic geometry/graphing problem
The vertices of a triangle are the points of intersection of the line y=-x-1, x=2 and y = 1/5x + 13/5. Find an equation of the circle passing through all three vertices. I don't understand how to solve this: should I set them all equal to find the vertices? But afterwards...
March 19, 2013

Trigonometry - finding cos 36 given cos 72?
thx
March 18, 2013

Trigonometry - finding cos 36 given cos 72?
Please help, I know cos 72 degrees = (sqrt 5 - 1)/4. I need to know what cos 36 degrees is. How to do so?
March 18, 2013

slope and graphing
The lines y=5/12x and y=4/3 are drawn in the coordinate plane. Find the slope of the line that bisects these lines. How? Do we find the average? Do we build isosceles triangles?
March 10, 2013

Graphing Circles - Finding the radius
A circle is tangent to the y-axis at the point (0,2) and passes through the point (8,0). Find the radius of the circle. I tried using distance formula but it doesnt work? Help please thanks.
March 10, 2013

Please help analytic geometry
THANKS A LOT!
March 9, 2013

Please help analytic geometry
A line with slope 6 bisects the area of a unit square with vertices (1,0), (0,0) , (1,1), and (0,1). What is the y-intercept of this line? I tried putting one point where the line intersects the square as (y,1), and the other as (x,0), and the y intercept as (0,a). Then, I ...
March 9, 2013

Hamilton
3 1/3 = 10/3 10/3 /4 = 10/3 * 1/4 5/3 * 1/2 = 5/6 she studied 5/6 hours each day 5/6 * 60 minutes = 50 minutes per day
March 9, 2013

math
192 /2 = 96 for a year 96 is equal to 1.6 / 100 = 16/1000 = 2/125x 125/2 * 96 = x 6000=x so he should depoist 6000 dollars
March 9, 2013

Lang. Arts
Yes it is D. Type up direct quotation v indirect quotation
March 9, 2013

Life orientation
huh?
March 9, 2013

Life orientation
dont double post please
March 9, 2013

Please help with graphing in geometry
Find the largest real number x for which there exists a real number y such that x^2+y^2 = 2x+2y . I think it is a circle, but how am i supposed to figure this out??
March 9, 2013

math
same thing as below. 10/8 = x/20 5/4 = x/20 4x = 100 x=25 Plugging in, 25/ 20 = 10 /8 = 5/4 = 5/4
March 6, 2013

Math
What are we given sire?
March 6, 2013

math Ms. Sue please ASAP
volume of cone = 1/3 r^2 h 25 * 12 * 1/3 = 100 ft^3 the answer is 100ft^3 for 6
March 6, 2013

QSO 51O
So, what is the question sir?
March 6, 2013

Math
1/4 + 1 = 5/4 so 48.75 =5/4 x So, 4/5 * 48.75 = x x = $39
March 6, 2013

Math
For the parallelogram, the area is base times height so, h * 15 = 300 the height is 20 For number 2 use the distance formula. 2,3 to 2,6 is 3 units. 2,6 to 7,6 is 5 units 7,6 to 7,3 is 3 2,3 to 7,3 is 5 So it is a rectangle 5 x 3
March 6, 2013

algebra
4.7 -1.7 = 267 3x = 267 x = 89
March 5, 2013

Analytic geometry - finding point by intersect lin
thanks a bunch
March 5, 2013

Analytic geometry - finding point by intersect lin
I have a triangle ABC. The slope of AB is -1/ab, the slope of AC is -1/ac, and the slope of BC is -1/ac. My question is, I have 3 lines: Altitude from A to BC, altitude from B to AC, and altitude from C to AB. I know their slope because it is just -1/slope. But I want to know ...
March 5, 2013

Analytic Geometry - Reflecting points over lines
Thanks a lot, after following your suggestions I got (1,9).
March 4, 2013

Analytic Geometry - Reflecting points over lines
THANKS A LOT EVERYONE but if the point Q is on 3,1 (I suppose that is what you meant) then i dont think its right since if it is reflected over the line 1/2x+2 then it would be on the other side, right?
March 4, 2013

Analytic Geometry - Reflecting points over lines
Let P = (5,1), and let Q be the reflection of P over the line y = 1/2x + 2. Find the coordinates of Q. I don't understand how to start? Should we draw perpendicular lines? Analytic Geometry - Reflecting points over lines - Steve, Monday, March 4, 2013 at 12:15pm Given (x,y...
March 4, 2013

college algebra
Which quadratic equation? y=-x^2+2x+8?
March 4, 2013

Analytic Geometry - Reflecting points over lines
thanks a lot
March 4, 2013

Analytic Geometry - Reflecting points over lines
Let P = (5,1), and let Q be the reflection of P over the line y = 1/2x + 2. Find the coordinates of Q. I don't understand how to start? Should we draw perpendicular lines?
March 4, 2013

math
before 300 x 150 now: (3x+300)(3x+150) We expand this by multiplying the first two terms (3x and 3x) Then add that to the first term of the first parentheses (now henceforth p) and the last term of the second p. Then add that to the last term of the first p and the first term ...
March 4, 2013

Pre-Algebra
Posted by cassie on Wednesday, February 27, 2013 at 11:26am. What association would you expect if graphing height and weight? A.positive B.nonlinear C.negative D.none of these I think it is A...? Algebra - Steve, Wednesday, February 27, 2013 at 1:09pm I think you are right. as...
March 4, 2013

math
surface area = 2pi (r^2 + rh)(it is the formula) So, we just plug it in. ignoring the 2 pi, we see that r^2 = (3x-2)^2 = 9x^2-12x+4 r*h = (3x-2)(x+3) Then we get for rh = 3x^2-2x+9x-6 = 3x^2 +7x-6. We add these together to get 12x^2 -5x-2 multiply by 2pi we get 2pi(12x^2-5x-2...
March 4, 2013

Geometry - Dilation of a square
The preimage of square ABCD has its center at (8,-8) and has an area of 4 square units. The top side of the square is horizontal. The square is then dilated with the dilation center at (0,0) and a scale factor of 2. What are the coordinates of the vertex of the image of square...
March 2, 2013

math
1,2/3,4/9,8/27,16/81,32/243 If you meant 4 as in blank
March 1, 2013

math
Wait...isnt 1992 not divisible by 5...? It has a remainder of 2 so it would be 2 right?
March 1, 2013

math
goes in pattern 12345 find the remainder when divided by 5. It is 2. Thus it is 2. (coincidentally)
March 1, 2013

math
2 times as long....
March 1, 2013

math
It will be the last day.... Remember Ms. Sue, Friday, March 1, 2013 at 9:22pm "Remember the lilies double every day" So the previous day would be half the amount.
March 1, 2013

math
already answered by bobpursley
March 1, 2013

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