Sunday
January 22, 2017

Posts by steve

Total # Posts: 47,949

mathematics
a + a+d = 4 a+9d = 19 a+4d + a+5d = ?
January 1, 2017

calculus-add
see your earlier post for #1 For #2, review your techniques for 1st order linear ODEs, and see whether you can get the solution given here: http://www.wolframalpha.com/input/?i=(x-2)+dy%2Fdx+%3D+1-3y(x-1)%2F(x%2B1) Solve the homogeneous equation using partial fractions, and ...
January 1, 2017

calculus
huh? simple separation of variables. (2y-1) dy = (3x^2+1) dx y^2-y = x^3+x + C Using your point (1,2), find C: 4-2 = 1+1+C C = 0 y^2-y = x^3+x y = (1±?(4x^3+4x+1))/2
January 1, 2017

Analytic Geometry
C is the center, so 4 = (-1+x)/2 6 = (y+8)/2 ...
January 1, 2017

Analytic Geometry
Draw your line segment with the labeled points. It should be clear that LM=10 Now you can plug in the lengths required to evaluate the expression.
January 1, 2017

shaekh
a ba - a bb
December 31, 2016

Algebra
z/z = 1 so, multiply by that.
December 31, 2016

Algebra
the elevation is already given as an integer...
December 31, 2016

Algebra
commutative means they can be written in reverse order. So, ...
December 31, 2016

algerbra
you have the numbers. Just use them.
December 31, 2016

Algebra
we usually think of win as positive lose as negative
December 31, 2016

integral calculus
coth * sinh = cosh so your integral is just 1/cosh^2(2x) dx = sech^2(2x) dx That's just a standard form (almost).
December 31, 2016

Algebra
google is your friend: http://m.nextgurukul.in/nganswers/ask-question/answer/The-ratio-of-the-sum-of-n-terms-of-two-APs-is-7n14n27/Arithmetic-Progressions/21214.htm
December 31, 2016

Surds
?(2+?3) = ?((4+2?3)/2) = ?((1+2?3+3)/2) = ?((1+?3)^2/2) ...
December 31, 2016

Math
using similar triangles, the tree is 24/4 = 6 times as high as Palmer's eye.
December 30, 2016

Math
well, y = 35.00 + 1.50 x, so ...
December 30, 2016

Math
just use the [power rule to find the derivative of each term: d/dx x^n = n*x^(n-1) As for finding the roots, derivatives don't help much with that. But, digging back into your Algebra I skill set, note that f(x) = -x^2(x+1) + 16(x+1) = (16-x^2)(x+1) ...
December 30, 2016

math
Using brute force, since a = (-1+?23 i)/6 27a^4 = (49+11?23 i)/6 and so does 11a+10
December 30, 2016

math
see related questions below
December 30, 2016

math
the same as the difference between -2 and 2 or -10 and 10 since -(x-3) = 3-x
December 30, 2016

Maths
20*10 - 16*6 = ?
December 30, 2016

calculus help
dm/dx = -w(l-x) dm = -w(l-x) dx m = w(l-x)^2/2 + C you cannot just say that M = wl^2/2 It has to be for some value of x. I presume you meant to say that M(0) = wl^2/2 in which case C=0
December 30, 2016

maths
see whether this gives you some ideas: http://softwareengineering.stackexchange.com/questions/158315/what-does-value-propagation-mean However, elimination might be more useful here. You can manipulate the equations so that this is easy. 3x+2y=4 2x-3y=7 9x+6y = 12 4x-6y = 14 ...
December 30, 2016

Math
(1200/.90)*1.10
December 30, 2016

Geometry
since perimeter is a linear quantity, it scales the same as the length: the scale factor is 2.
December 30, 2016

maths and science
since 4/5 is submerged, its density is 4/5 that of water.
December 29, 2016

Math Trigonometry
If the point directly below the plane is P, and the two towns are W and E, then their separation is 8cot34° + 8cot49°
December 29, 2016

Geometry
well, geez. h = 5r = 60 Now just use your area formula.
December 29, 2016

Math
huh. I guess you don't like my formula. What did you use?
December 29, 2016

Math
s" = -4sin(t) + 4cos(2t) maybe you can at least supply the units, eh?
December 29, 2016

maths 1A
See what you can do with your sum-to-product formulas. This should get you started: cos(S-A)+cos(S) = 2cos(((S-A)+S)/2)cos(((S-A)-S)/2) = 2cos((2S-A)/2)cos(A/2) = 2cos((B+C)/2)cos(A/2)
December 29, 2016

math
2 = 1+1, right?
December 29, 2016

math
see related questions below
December 29, 2016

maths
That's why I love trig - there are so many ways to mix and match those functions, sometimes in totally unexpected ways!
December 29, 2016

maths
yes, except my error: y = 2?/3 or 4?/3 or 0
December 29, 2016

maths
Once you get to cos(y) = cos(2y) 2cos^2(y)-cos(y)-1 = 0 (2cosy+1)(cosy-1) = 0 cosy = -1/2 or 1 y = 2?/3 or 5?/3 or 0 x = y + ?/4 ...
December 29, 2016

Riddle
Give it a good shove, and I think a grand piano will open most doors...
December 29, 2016

Mathematics
xUy = {a,b,c,d,f,h,l,o,u} that is, everything in either set x?y is what is in both sets x'?y' = (xUy)' everything except xUy
December 29, 2016

Maths sequence and series
well, log(xy) = logx + logy so, you have an AP with a = logx d = logy S30 = 2(3^30-1)/(3-1) ? 3^30 (10^.477)^30 ? 10^14.313 log2 = .3010, so 10^.313 * 10^14 > 2*10^14
December 29, 2016

SAT Math
4w(z) = 4(6+3z) = 96 24+12z = 96 12z = 72 z = 6 the x in w(x) is just a placeholder. w(x) = 6+3x w(z) = 6+3z w(12)= 6+3*12 and so on.
December 29, 2016

science
KE = 1/2 mv^2 watch the units.
December 29, 2016

Maths
the angles A,B,C are x, x+y, x+2y They sum to 180, so 3x+3y = 180 x+y = 60 angle B is x+y, so ...
December 29, 2016

Business mathematics
the number who passed something is 18+17-11 = 24 Now just draw the usual Venn diagram to answer the questions.
December 29, 2016

Maths
12 = 1/3 of 36
December 29, 2016

Calculus
well, for any value except x=0, the quotient is 1. So, the limit is clearly 1. x/x is 1 everywhere except x=0.
December 28, 2016

Science
F = Gmm/r^2 = G*10*10/50^2 If their centers of mass are 50m apart.
December 28, 2016

Physics
looks right to me.
December 28, 2016

Math
The base is x^2 The height is 30/x^2 So, the area is x^2 + 4(x)(30/x^2)
December 28, 2016

Math
1.12(475/.95) = 560
December 28, 2016

Math(A.P)
a+3d = 3a a+6d = 2(a+2d)+2 now just crank it out.
December 28, 2016

Computer Science
there are lots of snippets of C code online. google is your friend.
December 28, 2016

maths go with @MathMate
My bad - I missed the fact that it was open on the ends.
December 28, 2016

maths
just compute the volume inside the metal and subtract it from the outside volume. ?/4 * 24^2 * 55 - ?/4 * 20^2 * 51 = 2820? cm^3
December 28, 2016

Math
Manufacturer's Recommended Price also seen as MSRP Mfgr's Suggested Retail Price
December 28, 2016

math
The distance from (5,12) to the line is |2*5 - 1*12 + 3|/?(2^2+1^2) = 1/?5 So, the circle is (x-5)^2 + (y-12)^2 = 1/5 check: The line and the circle must intersect at a single point. (x-5)^2 + ((2x+3)-12)^2 = 1/5 This has a solution only at x = 23/5
December 28, 2016

Maximum value
if x^2-ax >= 0, |x^2-ax| = x^2-ax That is, if x(x-a) >= 0 x <= 0 or x >= a These intervals are outside the domain. If x^2-ax < 0, then |x^2-ax| = -(x^2-ax) That is, if x(x-a) < 0 So, for 0<=x<=a the maximum value of f(x) is at x = a/2 See a sample graph...
December 28, 2016

Finding Range - Maths
the domain is (-?,-100)U(100,?) Since f(x) = 1/x^2, the range is the same on both those intervals. So, R = (0,1/100^2) if the domain is (-0.1,0.1) then f(0) is undefined. The range is thus (1/0.1^2,?) since f(x) is symmetric about x=0.
December 28, 2016

maths
They sum to 360, so 3x+5x+7x+9x = 360 find x, then you can get the angles. (not the lengths)
December 28, 2016

Math
If the smallest (2nd) piece is x, then just add up the lengths: 2x + x + x+4 = 10 now find x, and you can figure the length needed.
December 27, 2016

geometry
so the arcs will overlap, giving two points on the bisector line.
December 27, 2016

Math
My first estimate of T'(10) would be the average change from t=8 to t=12: (T(12)-T(8))/(12-8) = (86-73)/4 = 3.25 Using a forward estimate from t=10, it might be (T(12)-T(10))/(12-10) = (86-80)/2 = 3.0
December 27, 2016

Algebra2
12+x = .85(15+x)
December 27, 2016

trig prove plz anyone help
recall that tan(A-B) = (tanA-tanB)/(1+tanAtanB)
December 27, 2016

Math
10000*0.10*n = 5000 or, each year's interest is $1000, so ...
December 27, 2016

Math
j = t-5 jt = 126 Hint: 9*14 = 126
December 27, 2016

Math - typo?
you sure that h(2) = 44? I suspect it is h(3) = 44.
December 27, 2016

Maths - Cartesian Equations
(y/2)^2 = (t + 1/t)^2 = t^2+2+1/t^2 x^2 = (t - 1/t)^2 = t^2-2+1/t^2 y^2/4 - x^2 = 4 or in standard form, y^2/16 - x^2/4 = 1
December 27, 2016

Maths - Parametric Equations
(a) surely you can just plug in a value for t! x = 2cos(8?/3) = 2(-1/2) = -1 y = 2sin(8?/3) = 2(?3/2) = ?3 (b) Now you have a point and a slope, so the tangent line is y-?3 = 1/?3 (x+1)
December 27, 2016

Maths
5x * 2x = 360 Find x, and then you know the base and height.
December 27, 2016

Math
If there are x tables, then we have 9(x-2) = 6x+3
December 27, 2016

Math
just consult a map. I mean, there aren't that many oceans, right?
December 27, 2016

value
misspelled
December 27, 2016

social stadies
misspelled
December 27, 2016

economics
Note that the marginal cost is the derivative of the total cost. Note that the average variable cost is the integral of the marginal cost over the given interval. AVC is a minimum when MC = AVC. A nice video is here: https://www.youtube.com/watch?v=TBCAHbhhvTg
December 27, 2016

calculus help me plz too hard show step
R dQ/dt + Q/C = 0 R dQ/dt = -Q/C dQ/dt = -Q/(RC) dQ/Q = -1/(RC) dt lnQ = -1/(RC) t + k at t=0, we know that Q=Qo, so lnQo = k so, lnQ = -1/(RC) + lnQo ln(Q/Qo) = -1/(RC) t Q/Qo = e^(-t/RC) Q = Qo e^(-t/RC)
December 27, 2016

Math
x^2 = ln(xy) x^2 = lnx + lny 2x = 1/x + 1/y y' y' = y(2x - 1/x) y'(1) = e(2-1) = e or, more explicitly, ln(xy) = x^2 xy = e^(x^2) y = e^(x^2)/x y' = e^(x^2) (2x-1)/x^2 y'(1) = e^1 (2-1)/1 = e
December 27, 2016

math
first step: STOP REPEATING THE POST!
December 26, 2016

math
surely you can do 3*5 now just move the decimal point as needed. .5% = 1/200 I'm sure you can do 3200/200 .5 is 1/2, but .5% is not. 10.00 - 8*0.82 = ?
December 26, 2016

algebra
http://www.wolframalpha.com/input/?i=plot+y%3C%3D+3%2F2+x%2B3,+2x+%2B+y%3C10,+y%3E-1
December 26, 2016

Proofing Maths
of course. |x-y| = |x + (-y)| <= |x| + |-y|
December 26, 2016

Physics
7@N40W = <-4.50,5.36> 10@E = <10.00,0.00> now just add them up and use the normal distance formula.
December 26, 2016

algebra
They are the same equation, so infinitely many solutions.
December 26, 2016

Math
h'(1) = f'(f(1)) f'(1) = f'(3)f'(1) = 7*2 = 14
December 26, 2016

algebra
256z^2 -4 -192z^2 +3 = (256z^2-4) - 3(64z^2-1) = (16z-2)(16z+2)-3(8z-1)(8z+1) = 4(8z-1)(8z+1)-3(8z-1)(8z+1) = (8z-1)(8z+1) cool, eh?
December 26, 2016

Maths(Surface integral/flux)
recall polar coordinates: x^2+y^2 = r^2 dx dy = r dr d?
December 26, 2016

calculus too hard
just keep on ... dx/dt = k(a-x) dx/(a-x) = kt ln(a-x) = kt^2/2 or, using a new k ln(a-x) = kt^2 a-x = e^(kt^2) Now use your initial conditions to find a and k.
December 26, 2016

math
or, see how much 1 set of 9 notes is worth: 2*3+5*2+10*4 = 56 728/56 = 13 So there are 13 sets of 9 notes...
December 26, 2016

math
Add up the value of each kind of note: 2(3x)+5(2x)+10(4x) = 728 now find x, and the total number of notes is 3x+2x+4x = 9x
December 26, 2016

ACCOUNTING
<font Courier/> hello
December 26, 2016

ACCOUNTING
p { font-family: "Times New Roman", Times, serif; } Times Roman
December 26, 2016

ACCOUNTING
???? ???? ???? ???? ? ?? ? ?? ? ?? ? ?? ???? ???? ???? ???? ???? ???? ???? ???? ????????????????????? ? ????? Some Text  ?? ? ????? in the box ?? ?????????????????????? ? ??????? ?? ? ??????? ?? ?????????????????????? ?????????????????????
December 26, 2016

ACCOUNTING
???? ???? ???? ???? ? ?? ? ?? ? ?? ? ?? ???? ???? ???? ???? ???? ???? ???? ???? ????????????????????? ? ????? Some Text ?? ? ????? in the box ?? ?????????????????????? ? ??????? ?? ? ??????? ?? ?????????????????????? ?????????????????????
December 26, 2016

MATH
recall that log and ^ are inverse operations: 10^(log x) = x log(10^x) = x so, now you can do 10^(log_10(a)) = 10^4 a = 10^4
December 26, 2016

Math
y-x = 4 3x = 2y+4
December 26, 2016

Proofing Maths
google is your friend. Lots of help with the triangle inequality. Once you have convinced yourself that |x+y| <= |x| + |y| then it is a simple extension to get to your problem.
December 26, 2016

Math
since tests count twice, add them twice. The total points must be the same as 5 scores of 70: 88+82+84+2x = 70*5 x = 48
December 26, 2016

MATHS
minar?
December 26, 2016

physic
If you mean a point on the edge of the wheel, then recall the relationship between linear speed v and angular speed ?: v = r? since arc length s = r?
December 26, 2016

science
Since the weight is proportional to 1/r^2, 5 times the weight means 1/?5 times the distance.
December 26, 2016

Math
The trick here is to recall that 1 = cos^a+sin^2A cos2A/(1+sin2A) (cos^2A-sin^2A)/(1+2sinAcosA) (cos^2A-sin^2A)/(cos^2A+2sinAcosA+sin^2A) (cosA+sinA)(cosA-sinA)/(cosA+sinA)^2 (cosA-sinA)/(cosA+sinA) (cotA-1)/(cotA+1)
December 26, 2016

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