Monday
September 26, 2016

Posts by steve

Total # Posts: 44,087

Science
first, g is m/s^2, not m/s F = GmM/r^2 = 9.8m you have a new R=100/64 r = 25/16 r So, g will be (16/25)^2 as big 9.8 * (16/25)^2 = 4.01 m/s^2
September 6, 2016

Math
Hmmm. I get 10 m^(5/3) n^(1/8)
September 6, 2016

Physics
how long does it take to land? 4.9t^2 = 10 Use that t to determine horizontal distance, which is d = 8t I must say, 10m is not much of a cliff...
September 6, 2016

Physics
huh? v1 = <-6.6,0> don't get so bogged won in formulas that you fail to recognize simple geometry! If you must rely on the formulas, note that θ=180°
September 6, 2016

algebra
start by grouping digits 10,000,000,000,000,000,000,000,000,000,000 Now figure out the name of the group you want.
September 6, 2016

math
Nope: y = 4x+5
September 6, 2016

Astronomy
how far is it from the sun to the earth? That is 1 a.u.
September 6, 2016

Maths
42%
September 6, 2016

Trig
I hope you got sinA = 3/5 cosA = 4/5 tanA = 3/4 sinB = 15/17 cosB = 8/17 tanB = 15/8 given that, then sin(A+B) = 3/5 * 8/17 + 4/5 * 15/17 = 84/85 cos(A+B) = 4/5 * 8/17 - 3/5 * 15/17 = -13/85 tan(A+B) = 84/-13 = -6.46 it might have been nice to see where you went wrong there. ...
September 6, 2016

Maths
1/x + 1/y + 1/z = 1/15 x = 2(y+z) y = 3(x+z) Hmmm. I suspect a typo.
September 5, 2016

Math
30/18 5/3 15000/9000
September 5, 2016

math
well, f(x) = (x^2-5)(x^2+3) ...
September 5, 2016

math
if the short leg is x, then x^2 + (x^2-5)^2 = (2x^2-13)^2
September 5, 2016

Algebra
oops. for raw increase, 42/300 * 3
September 5, 2016

Algebra
42/300 * 3/30
September 5, 2016

Math urgent
(x+y)^2 - 2(x+y) - 15 = 0 (x+y-5)(x+y+3) = 0 ...
September 5, 2016

Pre algebra
y = kx, so 17 = 34k
September 5, 2016

math
18/72 = ?
September 5, 2016

Math
2π ≈ 6 40/6 ≈ 7 what do you think?
September 5, 2016

Pre algebra
y = k/x, so plug in your numbers: 8 = k/5
September 5, 2016

Calculus
the normal to the plane has direction cosines proportional to <1,-1,2>, so x = 4+t y = 1-t z = 4+2t xy-intercept: z=0, so t = -2 (2,3,0) and so on
September 5, 2016

Calculus
mosey on over to http://math.stackexchange.com/questions/475953/how-to-calculate-the-intersection-of-two-planes and have a gander there.
September 5, 2016

MATH HELP CHECK ANSWER
7-3 < x < 7+3 4 < x < 10 So, B or C looks good
September 5, 2016

Math
factor out the highest powers common to both factors: x^2y^2 (xy^2 + 1)
September 5, 2016

Math Please Help
your screen name reminds me of this one: aibohphobia: fear of palindromes
September 5, 2016

Math Please Help
much better
September 5, 2016

Math Please Help
oops. #5 the area is 3^2 times as big.
September 5, 2016

Math Please Help
5 ok 6 huh? How can a parabola have three roots? Did you try graphing it? Remember the quadratic formula? recall that an nth degree polynomial has at most n real roots
September 5, 2016

Science
under what conditions? If you just want the energy equivalent, then use the good old formula E = mc^2 using the appropriate SI units
September 5, 2016

MATH HELP PLEASE ASAP
Just to refresh your memory on why this is true, the distance from a to b is b-a the value halfway from a to b is thus a + (b-a)/2 = (2a+b-a)/2 = (a+b)/2
September 5, 2016

MATH HELP PLEASE ASAP
the midpoint has the average coordinates of the ends: ( (4+0)/2 , (-4+5)/2 ) = (2,1/2)
September 5, 2016

math
there's nothing to distribute a(b+c) = ab + ac uses the distributive property You can, however, apply the power to each factor individually
September 5, 2016

Science
max height is reached when it comes to a stop v = 14-gt solve for t when v=0 and use that to find h in h = 14t - g/2 t^2 Or, use (or derive) a simpler more direct formula without finding t first.
September 5, 2016

chem 2
first step: write the balanced equation next, use moles instead of grams
September 5, 2016

Trigg
recall your polar coordinates x = r cosθ y = r sinθ here, θ is in QIII
September 5, 2016

Calculus
If you recall the determinant form of the triple product, you will see that both are zero, since two rows of the determinant are the same.
September 5, 2016

Math
a = ∆v/∆t = (60-30)/7 m/s^2
September 5, 2016

Calculus
The center is at (6,6,6) The diameter has length √12=2√3 so, the sphere is (x-6)^2 + (y-6)^2 + (z-6)^2 = 3 It'd be better in the future if you provide some of your work when you get stuck.
September 5, 2016

maths
It's not. Having a square root is. √x = x^(1/2) 1/√x = x^(-1/2) Your assertion is true if you are solving for a, since to find a you need to take the square root.
September 5, 2016

Physics
First, I'd say, since when is 50 bigger than 140?
September 5, 2016

calculus
F' = f'(xf(xf))*(f(xf)+xf'(xf)(f+f(xf'))) = f'(f(f(1)) * (f(f(1))+f'(xf(1))(f(1)+f(f'(1))) = f'(f(4))*(f(4)+f'(4)(4+f(4))) = f'(6)(6+5(4+6)) = 6(6+50) = 6*56 = 336
September 5, 2016

math
If there are x apples and y oranges, we know that x/y = 2/3 (1/3 x)/(y-23) = 3/2 Now just solve for x
September 5, 2016

math
r^2-x^2 = 4^2 r^2-(4-x)^2 = 3^2 now just solve for r
September 5, 2016

calculus
y(6) = 36A+6B = 8 y' = 2Ax+B y'(6) = 12A+B = 7 Now just solve for A and B.
September 5, 2016

Chemistry
Why is it important to keep the beaker containing the mobile phase covered while preparing your chromatography paper and developing your chromatograms?
September 5, 2016

math
b+g=53 3/5 b + 5/7 g = 35 or, knowing that g is a multiple of 7 b is a multiple of 5 how many such multiple pairs add to 53?
September 5, 2016

Math
xx.x66xxx
September 5, 2016

math
3/4 as many people: 4/3 as many hours
September 5, 2016

Statistics
well, 70 is 2 std above the mean. Look that up in your Funk and Wagnall's (or, more productively, in your Z table).
September 5, 2016

MATH
5*8 + 4*10
September 5, 2016

profit and loss
1.20x + 1.2 = 1.40x
September 5, 2016

math
(2(n+5)-10)/2 = n
September 5, 2016

profit and loss
.55*1.05 + .45*1.08 = 1.0635 .45*1.05 + .55*1.08 = 1.0665 so, what is the % change? The amount invested does not matter, since it is all the same.
September 5, 2016

Math
42
September 5, 2016

math
let's just call 4/3 pi = k since it does not depend on r. v(2r)/v(r) = k(2r)^3/kr^3 = 8kr^3/kr^3 = 8
September 5, 2016

Calculus
come on - you did this for 2D figures back in Algebra II: x^2+4x + y^2-2y + z^2-2z = 19 x^2+4x+4 + y^2-2y+1 = z^2-2z+1 = 19+4+1+1 (x+2)^2 + (y-1)^2 + (z-1)^2 = 25
September 4, 2016

Math
since -1 <= sin(u) <= 1 e^x -> +∞ 1/∞ = 0 as x -> +∞ But, oddly enough, this only a one-sided asymptote, since e^-∞ = 0, e^x-2 -> -2 as x -> -∞ And of course, there is the vertical asymptote at x = ln(2) http://www.wolframalpha....
September 4, 2016

calculus
yeah - where f'(x) = 0 f'(x) = -10sinx + 10cos2x now just find where that is zero
September 4, 2016

calculus
Let's take this a step at a time F' = f'(xf(xf(x))) * (xf(xf(x)))' (xf(xf(x)))' = f(xf(x)) + xf'(xf(x)) f'(xf(x)) = f(x) + xf'(x) so: F'(1) = f'(1f(1f(1))) * (f(1f(1)) + f(1)+f'(1)) = f'(f(4)) * (f(4)+f(1)+f'(1)) = f'(6...
September 4, 2016

calculus
clearly there are none.
September 4, 2016

Math
put it where? 2.0*10^-7 / 8.0*10^-9 = (2.0/8.0)*10^(-7 - (-9)) = 0.333 * 10^2 100/3
September 4, 2016

Math
still no ideas of your own? Try google when you have no clue: http://math.stackexchange.com/questions/202679/sum-of-digits-and-product-of-digits-is-equal-3-digit-number
September 4, 2016

Algebra
same as always (1+(2i/n))^2 *(2/n) (1 + 2(2i/n) + (2i/n)^2) * (2/n) 1(2/n) + 2(2i/n)(2/n) + (2i/n)^2(2/n) 2/n + 8i/n^2 + 8i^2/n^3
September 4, 2016

Math Algebra
A is the same distance from (1,3) as B is. You don't need to know that the distance is √29. You just need to subtract the same values from (1,3) as were added to get to (4,-1) (1,3)+(3,-4) = (4,-1) So, you need (1,3)-(3,-4) = (-2,7)
September 4, 2016

algebra
82.4 <= f <= 659.2
September 4, 2016

maths
2(n+12) = 3/2 (2n+12)
September 4, 2016

Math
when you have no clue, try google first: https://answers.yahoo.com/question/index?qid=20090501152219AAtVxte
September 4, 2016

Math
Clearly the T can occur in any of the 3 positions.
September 4, 2016

Math
any of 18 different numbers can show on each roll. So, there are 18*18*18 different sets of 3 events
September 4, 2016

Pre cal
I assume you get this far ok: ... (x-4)(x^2+4) x^3-4x^2+4x-16 evaluate that at x = -1, and you get -1-4-4-16 = -25 That means that if f(x) = a(x^3-4x^2+4x-16) then f(-1) = -25a But, we want f(-1) = -50 so, -25a = -50 a = 2 f(x) = 2(x^3-4x^2+4x-16)
September 4, 2016

Math
wait - we doing heights or lengths? anyway, average = sum/count
September 4, 2016

yuiljk
200/50 + 1
September 4, 2016

Physics
subtract the area of the hole from that of the disc rim; then multiply by the thickness: π(128^2 - 15^2)(0.75) mm^3
September 4, 2016

Math
it will be the same as when it went up.
September 4, 2016

Basic Math
yes, it would.
September 4, 2016

Computer science
If you haven't already written your own routine, google one of your choosing. You should "zero" in on n ≈ 19.2681
September 4, 2016

Physics
work = force * distance the mass does not matter; it just affects how long it will take.
September 4, 2016

MATH
1 * 26^3 * 10^2
September 4, 2016

Algebralgebrad
no, 1+tanx is not the same as 1+tan^2x use your sum-to-product formulas: cosx-cosy = -2 sin(x+y)/2 sin(x-y)/2 sinx+siny = 2 sin(x+y)/2 cos(x-y)/2 so the quotient is just -tan(x-y)/2 the 2nd term is similar recall that (a+b)^3 = (a+b)(a^2-ab+b^2) csc2x = 1/sin2x = 1/(2sinx cosx...
September 4, 2016

Math
since 24 = 6*2^2 any multiple of 6 that does not also have 2 as a factor: 6*1=6 6*3=18 6*5=30 6*7=42 etc.
September 4, 2016

algebra
as with any cone, v = π/12 d^2 h
September 4, 2016

mathematics - algebra
well, tanθ >= 121/915, so ...
September 4, 2016

Pre Calc
http://www.wolframalpha.com/input/?i=-x%5E2%2B9x-8
September 4, 2016

Math
30*4.2 -------- 5/3
September 4, 2016

math help
y = x^2/2 y' = x so, the line through (3,9/2) with slope=3 is y - 9/2 = 3(x-3)
September 4, 2016

Math
5/20 = ...
September 4, 2016

Trignometric
2tan^2(x) + sec^2(x) = 5 - 4tan(x) 2tan^2(x) + 1+tan^2(x) = 5 - 4tan(x) 3tan^2(x) + 4tan(x) - 4 = 0 (tanx+2)(3tanx-2) = 0 Now you know tan(x) cot(a+b) = 6 (cota*cotb-1)/(cota+cotb) = 6 cota = -2, so (-2cotb-1)/(-2+cotb) = 6 -12cotb-6 = -2+cotb -4 = 13cotb cotb = -4/13 or, use ...
September 4, 2016

algebra
how many o's? how many total letters?
September 4, 2016

Math
south: 120 cos46° west: 120 sin46°
September 4, 2016

Algebra
y = k/x 2 = k/6 ...
September 4, 2016

Math
I'll use x for ease of typing each turkey cost x.xx/72 72*x.xx = x67.9x start listing multiples of 72 that end in 9x: 72*11 = 792 72*18 = 1296 72*36 = 2592 Check to see which works out
September 3, 2016

MATH
x+y+z = x*y*z 1+2+3 = 1*2*3 ...
September 3, 2016

physics (Simple harmonic motion)
assuming t is in seconds, I don't see how to get 37.963m http://www.wolframalpha.com/input/?i=0.142sin(2t%2B0.19)+for+0%3C%3Dt%3C%3D210 unless t1 is not zero
September 3, 2016

Calculus
of course, the range is just the same as the range of 2sin(x)+3: [1,5] http://www.wolframalpha.com/input/?i=2sin(sqrt(3x-1))+%2B+3
September 3, 2016

Calculus
no idea. Just take it step by step. domain of √x is x>=0 so, the domain of √(3x-1) is 3x-1 >= 0, or x >= 1/3 the domain of sin(x) is all reals, so the domain of sin(√(3x-1)) is the domain of √(3x-1), or x >= 1/3
September 3, 2016

Calculus
that's a start. Now consider that 4 = 2^2 8 = 2^3 So, log_4(8) = (1/2)log_2(8) = 3/2 log_8(16) = (1/4)log_2(16) = 4/3 (3/2)/(4/3) = 9/8
September 3, 2016

Calculus
e^(1+2lnx) = e^1 * e^2lnx = e * (e^lnx)^2 = e * x^2 That should help some Tsk Tsk, Damon
September 3, 2016

math
The latus rectum's length is 2 times the distance from the focus to the directrix. Now recall the point-to-line distance formula, and you get |3*1-4*1+7|/√(1^2+1^2)
September 3, 2016

Math
as you know, the domain of sin(x) is (-∞,∞) The domain of √x x>=0 so, the domain of √(3x-1) is 3x-1 >= 0, or x >= 1/3 so, can you sort that out?
September 3, 2016

Math
well, geez! How many factors of 16 are there between 6 and 15?
September 3, 2016

  1. Pages:
  2. <<Prev
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. Next>>