Sunday
September 25, 2016

Posts by Steve

Total # Posts: 44,023

Algebra
you want w when 900+10w = 500+15w
September 6, 2016

physics
You sure are cagey with the names of your vectors. I'll call them u,v,w. Just draw a diagram. It should be clear that the x- and y-components of vector u are x: -113 cos34° y: 113 sin34° Do the others the same way. For magnitudes, recall that |<x,y>| = √...
September 6, 2016

science
many discussions found via https://www.google.com/#q=electric+field+at+center+of+circular+arc
September 6, 2016

Math Please Help Me
just think about it. How much clay was used? 1 1/2 + 3/4 = 1 2/4 + 3/4 = 1 5/4 = 9/4 lbs Now, if each student uses 1/8 lb, the 1 whole pound is enough for 8 students, right? So 8 * 9/4 = 72/4 = 18 students can be satisfied. Or, since 1/4 lb = 2/8 lb, each 1/4 lb of clay will ...
September 6, 2016

algebra 2
Mary has a 2-hr start, so she's 120 mi ahead at 8 am. Tom hoes 10 mi/hr faster, so how long will it take him to make up the 120 mi?
September 6, 2016

maths
wow - can you make heads or tails of that gibberish? I assume that 22-60 means 22°60'. No idea what "tita" means. Must be "theta". At any rate, since the circumference of the earth is about 40,000 km, the plane flew 8000km = 1/5 of the way around ...
September 6, 2016

Math
just think about it. How much clay was used? 1 1/2 + 3/4 = 1 2/4 + 3/4 = 1 5/4 = 9/4 lbs Now, if each student uses 1/8 lb, the 1 whole pound is enough for 8 students, right? So 8 * 9/4 = 72/4 = 18 students can be satisfied. Or, since 1/4 lb = 2/8 lb, each 1/4 lb of clay will ...
September 6, 2016

Math
rate per hour is #dollars / #hours (1 1/2 + 3/4)/(1/8) or 8 * (3/2 + 3/4) = ?
September 6, 2016

Math
uh, -12/1
September 6, 2016

Algebra1
#1 D is correct #4 B is correct, but the rate of change of f is 2/3, and of g is -3/4 #10 A is correct #1 I agree. Must be a typo. f(1)+g(2) = 4, however #2 C is correct
September 6, 2016

math
start with volume = mass/density find the density of each liquid, and you can figure the volume. Then volume = arae * height You know the area of the liquid cross-section, so once you know the total volume, the height is height = volume/area
September 6, 2016

Technology
seems to me that R T G V F are done with the left index finger
September 6, 2016

Math
Huh? 10+2.5x = 25 2.5x = 15 ...
September 6, 2016

Math
After x years, the height y is y = 10 + 2.5x So, find x when y=25
September 6, 2016

Math
Ths distance of (x,y) from the y-axis is just x. So, √((x-2)^2 + (y-3)^2) = x (x-2)^2 + (y-3)^2 = x^2 x^2-4x+4 + (y-3)^2 = x^2 (y-3)^2 = 4x-4 (y-3)^2 = 4(x-1) as I showed using the properties of parabolas
September 6, 2016

Math
review the definition of a parabola. The standard equation is y^2 = 4px if the focus is at (p,0) and directrix x = -p So, you have to shift your axes giving you (y-3)^2 = 4(x-1) see http://www.wolframalpha.com/input/?i=parabola+(y-3)%5E2+%3D+4(x-1)
September 6, 2016

Calculus
I don't think we need to use the Laplace transform, since they are specifying V(t) as a piecewise function. Just specify two values for V to the left and right of t=3
September 6, 2016

business studies
what do you mean by "solve time"? And no, 45÷60 = 3/4
September 6, 2016

Geometry
come on. I did that! The two angles are equal, so the two expressions are equal. <DGI = <IGH x-3 = 2x-13 x = 10
September 6, 2016

Geometry
since GI bisects <DGH, <DGI = <IGH so, x-3 = 2x-13
September 6, 2016

Math Precal
Carefully draw the two vectors, placing the start of the wind vector at the end of the plane's vector. If you draw in some dotted axes, you can see that the angle between the vectors (geometric, not algebraic) is 90-30-15 = 45° The ground speed of the plane is found ...
September 6, 2016

Math
4 times the area means 2 times the side length. So, if x is the smaller side, 4x + 4(2x) = 5
September 6, 2016

Math*Coordinate Geometry ~the Challenge Test Your Skill People.
y = k(x+4)(x-3) now plug in x=0 to find z. z = -12k k = -z/12 So, y = -z/12 (x^2+x-12) = -z/12 x^2 - z/12 x + z so, for each z there is only one possible value for each of a,b,c
September 6, 2016

algebra
(7+2.5)m^2 + (6.5-4-1)n now just add up the numbers
September 6, 2016

algebra 1
Assuming you meant (0,3) then yes, it is a solution, since 0+3=3 -2(1) = -2 so (1,-4) is not a solution you are backwards again. I think you need to review what a solution is. You have answered all three questions exactly wrong.
September 6, 2016

Math
when dividing, subtract exponents, so you have c^(9-14) d^(-7-(-10)) = c^-5 d^3 or d^3/c^5
September 6, 2016

physics simple harmonic motion
http://www.wolframalpha.com/input/?i=15+sin(8%CF%80(t%2B.1250398))
September 6, 2016

physics simple harmonic motion
x(t) = 15 sin(8πt+Ø) at t=0, x=0.015, so 15 sin(0+Ø) = 0.015 sinØ = 0.001 for small Ø, sinØ = Ø so I'd say x(t) = 15 sin(8πt+0.001) = 15 sin(8π(t+.0000398)) so it appears that Ø=.0000398 But, x'(0) < 0...
September 6, 2016

math
1/4 + 1/3 + 1/6 = 3/12 + 4/12 + 2/12 = 9/12 = 3/4 that's how much the three ate.
September 6, 2016

math
not same as -3 ≠ 3
September 6, 2016

math please help asap
4+2x=7
September 6, 2016

algebra 1
nope. That is the solution to 3x = 24
September 6, 2016

Geometry
all correct
September 6, 2016

Pure Math Coordinate Geometry
Yes, you can say A is 1/3 of the way from B to O That's the same as saying A is 2/3 of the way from O to B.
September 6, 2016

Pure Math Coordinate Geometry
because OA:AB = 2:1 Draw the line OB of length 3 Mark point A such that OA=2 AB=1 A is 2/3 of the way from O to B
September 6, 2016

Pure Math Coordinate Geometry
A is 2/3 of the way from O to B. So, the x- and y-values are 2/3 of the way from (0,0) to (6,9). That help some?
September 6, 2016

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

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