Wednesday
September 28, 2016

Posts by steve

Total # Posts: 44,155

8th grade math
The slope-intercept form is called that for a reason: y = 0.2x + 0.3 decimals are just numbers, like any others.
September 14, 2016

Physics
you want (x,y) such that (11cos67,11sin67) + (x,y) = (7.7cos98,7.7sin98) Evaluate x and y, and then find θ such that tanθ = y/x
September 14, 2016

math
7 3/4 = 28/4 + 3/4 = 31/4 Now, 7 3/4% is 31/400
September 14, 2016

Math
foot: x/3.5 = cos70° top: y/3.5 = sin70°
September 13, 2016

Math
you are correct in a general way. That's true for any ratio.
September 13, 2016

algebra
1.40x + 0.25 = 1.99
September 13, 2016

Calculus integrals
well, there's no algebraic way to do it that I know of. Best to check the graph and approximate it. You know that x^2-36 is zero at ±6. cos^2(x) is positive there, so x will be on the inside of the interval (-6,6). So you can check nearby values and approximate it ...
September 13, 2016

Calculus integrals
well, df/dx = (x^2-36)/2 + cos^2(x) where is that zero? which is a max?
September 13, 2016

math
no idea. How tall was Tanya at age 6?
September 13, 2016

Math
If $x is at 4%, the rest $(8000-x) is at 2.5%, so .04x = .025(8000-x) + 34
September 13, 2016

Physics
2.4t^2 = 409
September 13, 2016

physics
she's late. avg speed is totaldistance/totaltime distance = speed * time
September 13, 2016

Math
well, it's √((-2-4)^2+(3+1)^2) = ...
September 13, 2016

Math
nope
September 13, 2016

math
m = 3j j/p = 5/2 p = 140 m = 3j = 3(5p/2) = 3(5*140/2) = ?
September 13, 2016

Algebra
well, what has changed? b and c changed places. Unfortunately, it's called "commutative" not "communicative" I guess you weren't communicating to well when the topic was covered.
September 13, 2016

Geometry
since PQS is half of PQR, PQR is 90 degrees. QED
September 13, 2016

algebra
see related questions below
September 13, 2016

algebra
7/12 * 24M
September 13, 2016

Math
mean and median will increase by 5 std will not change. Try it. That's the whole point of the std - it is independent of the actual magnitudes, just their spread. Your µ and σ look ok, too.
September 13, 2016

math
see http://www.jiskha.com/display.cgi?id=1473791919 same problem, different numbers.
September 13, 2016

math
j:e = 5:2 s:j = 4:9 j=36, so 36:e = 5:2 s:36 = 4:9 = 16:36 so, s=16 Now we have 36:e = 5:2 I don't like that, since 36 is not a multiple of 5.
September 13, 2016

math
m/e = 3/5 (m-7)/(e+7) = 1/3 Now just solve for m and e.
September 13, 2016

Math
Hint: 15+8=23
September 13, 2016

math
you're kidding, right? See Reiny's figures above.
September 13, 2016

Physics
F=ma plug in your numbers
September 13, 2016

Math
Assuming I interpret your bizarre language correctly, it appears you want x - 1/2 = 1/8 If I got that wrong, why don't you express your question as math?
September 13, 2016

maths
224000(1.02^16 - 1)
September 13, 2016

Geometery
If the length is x, then 2(x-1 + x) = 54
September 13, 2016

algebra
(14/3)x = 3131 x = 3131 * 3/14 = ? why waste all that time and space describing the fraction instead of writing it? sheesh.
September 13, 2016

algebra
3(x-2) + 2x = 4(x+2)-77
September 13, 2016

math
you know that for one cylinder, v = πr^2 h so, plug in your numbers and add .065L (as mm^3)
September 13, 2016

Algebra
since distance = time * speed, 7(x-y) = 28 4(x+y) = 48
September 13, 2016

Algebra
well, 7-4 = 3
September 13, 2016

Algebra
(1/5)x - (1/9)(x+1) = 3
September 13, 2016

differential calculus
how about v = 120000 * 0.92^t ??
September 13, 2016

Maths
If this much time has passed with no response, it is usually an indication that no one is sufficiently versed in statistics and probability theory that they feel they can provide useful help. I know that I'd have to review my textbooks to work it out. Believe it or not, we...
September 13, 2016

Physics
You have 5v + a/2 * 5^2 = 40 10v + a/2 * 10^2 = 105 Now just solve for v.
September 13, 2016

Triangles
yes
September 13, 2016

Triangles
13-10 < x < 13+10
September 13, 2016

mathematical phyaics
using the determinant form, two rows are the same, so the determinant is zero
September 13, 2016

mathematical phyaics
You have probably already seen that Ax(wxu) = w(A.u)-u(A.w) Now let A = vxw Then (vxw)x(wxu) = w(uxvxw) So, (uxv).(vxw)x(wxu) = (uxv).w(u.vxw) = (uxv.w)(u.vxw) = (u.vxw)^2 There are other proofs online
September 13, 2016

mathematical physics
a' = i + e^t(t^2+2t)j + 2cos2t k T = a'/|a'|
September 13, 2016

Math
just solve -16t^2 + 64t + 4 = 6464
September 13, 2016

math
24 = 2^2 * 3 48 = 2^3 * 3 52 = 2^2 * 13 so, what is the LCM?
September 13, 2016

science,physics
if moving in opposite directions, 3*5 = 2v
September 13, 2016

MATHS2
https://answers.yahoo.com/question/index?qid=20061106084200AAifTZM
September 13, 2016

math 101
.06x + .15*2 = .12(x+2)
September 13, 2016

Math 172
it's when R(x) = C(x) 23x = 14x+9000 Now just solve for x, then evaluate y.
September 12, 2016

Math
won't work. You must have balanced parentheses. Hint: 9*2 = 18
September 12, 2016

math
depends on how many were in the big bag, which you did not say.
September 12, 2016

Math
(u-5v)x(u+4v) = uxu - 5vxu + 4uxv - 20vxv = 9uxv (why?)
September 12, 2016

math
time = distance/speed, so t = 50/s
September 12, 2016

Math
one is a power of 2, one is an odd multiple of 2.
September 12, 2016

Algebra 2
b = bh/2 - 3 h = bh/2 - 6 bh/2 = b+3 = h+6 so, h = b-3 b = b/2 (b-3) - 3 2b = b^2-3b-6 b^2-5b-6 = 0 b = 6 or -1 pick b=6 so, h=3 bh/2 = 6*3/2 = 9
September 12, 2016

math
I think you mean difference of squares (3a-4)(3a+4)
September 12, 2016

Calculus
a = 2i + 6tj + 12t^2k v = 2ti + 3t^2j + 4t^3k + c at t=0, v=i, so c = i and v = (2t+1)i + 3t^2j + 4t^3k r = (t^2+t)i + t^3j + t^4k + c use r(0) to see that c = 2j-7k so r = (t^2+t)i + (t^3+2)j + (t^4-7)k
September 12, 2016

Math
-8 and -8
September 12, 2016

math
that already is
September 12, 2016

Calculus
just use the definitions in your text. Simple derivatives.
September 12, 2016

matematicas
xxx si, pero no es un ano (hablo portugues)
September 12, 2016

matematicas
si, mas no es un ano
September 12, 2016

matematicas
x = ano de mi nacimiento este ano = 1997 x+1997 - (x+10) - (x+15) + (1997-x) = 80 Hmmm. Debo de haber cometido un error. Pero se entiende la idea: poner las palabras en matemáticas
September 12, 2016

math
9i - 5 - 3i -5 + 6i
September 12, 2016

math
hint: the i stands for imaginary
September 12, 2016

MATH
(634/10) * 14 inches
September 12, 2016

math
numerical expressions
September 12, 2016

Maths
dilation
September 12, 2016

Solid mensuration
since the top diameter is 7/12 as big as the bottom diameter, the missing piece has a slant height of (7/5)(13) So to figure the numbers for the frustrum, find them for the entire cone and subtract the value for the missing piece. Or, since the frustrum is 7/19 as high as the ...
September 12, 2016

Math
the probability of getting any six specific tosses is (1/2)^6
September 12, 2016

algebra
so, just plug in your numbers!
September 12, 2016

Algebra
spot on.
September 12, 2016

Calculus
the density will be the (average value of the population) divided by the area just as we had to integrate the density times area to get total population . Remember that the average value of f(x) in the interval [a,b] is ∫[a,b] f(x) dx ------------------    ...
September 12, 2016

Calculus
funny how much time google can save you http://www.math.ucla.edu/~ronmiech/Calculus_Problems/32A/chap11/section7/732d51/732_51.html
September 12, 2016

Calculus
see your text for examples, or http://mathinsight.org/parametrized_curve_tangent_line_examples
September 12, 2016

Math
#1. Just pick any 6 consecutive integers and try it out #2. Consider the numbers x-2, x-1, x, x+1, x+2 #3. Should be clear. Even if you're not sure about some of them, the right one jumps out. #4. any multiple of 2 is even #5. start by noting that 17 is prime #6. trick ...
September 12, 2016

algebra
solve for what? And of course, it's probably vt, not ut.
September 12, 2016

algebra
do the division. If the remainder is subtracted, the new remainder will be zero.
September 12, 2016

SS ICY NORTH
I see someone else (not you?) was asking about Canada icy north google turned up several references for that
September 12, 2016

SS ICY NORTH
Hmmm. I see a few hits on google, but they relate to different topics. I see your subject is social studies. What kind of ICY NORTH are you referring to? Climate, Rock Band, what?
September 12, 2016

SS ICY NORTH
google
September 12, 2016

Physics
46 mi/hr = 20.56 m/s so v = at means t = 20.56/2.35 s work the other similarly or, just consider the ratio of time lengths
September 12, 2016

profit and loss
do you mean that If he now gets x eggs for rs10 he would get x+6 eggs or the discount lets him get 6 eggs for rs10?
September 12, 2016

Science
try this https://www.google.com/#q=inductive+vs+deductive is that your final answer?
September 12, 2016

Calculus
The population in a ring of radius r is density * area, so adding up all the rings you get ∫[0,7] 6∛(3+r^2) * 2πr dr hint: let u = 3+r^2 for the volume, you can use shells: ∫[0,5] 2πrh dx = ∫[0,5] 2πx(5x-x^2) dx discs: ∫[0,25] π...
September 12, 2016

physics
https://www.google.com/#q=drift+velocity+area+conductor
September 12, 2016

Algebra2
well, assuming your = means +, 6x+9y=6 6x-10y=44 ...
September 12, 2016

Math
f(x) = (1/x)^(sinx) = 1/(x^sinx) Let us take the limit as x→0+, since rasning negative numbers to real powers is not well defined. consider limit x→0 g(x)=x^x lng = x lnx = lnx/(1/x) limit ln g(x) as x→0 = (1/x)/(-1/x^2) = -x limit ln(g(x)) = 0 so, limit g(x...
September 12, 2016

Maths Percentage
1.4 * ate = 70 ate = 50 what do you get for the other parts? If you get stuck, show how far you got. You must have at least some idea where to start, even if it is only defining a variable.
September 12, 2016

precalculus
ok. It appears to be in QIV, and is a 12-35-37 right triangle. If you draw it correctly, you should be able just to read off the values of the trig functions of that angle.
September 12, 2016

Maths Percentage
Syed's is 5/4 of Emraan's So, Emraan's is 4/5 of Syed's
September 12, 2016

Math
no problem. Feel free to stop by any time, but next time you need to ante up some work before we bother betting.
September 12, 2016

Math
As written, I get none of the above. Show your work, and we can check what's going on. To get -16, the 2nd term must come out to -32, since 16-32 = -16
September 12, 2016

mechanic
200^2 + 200^2 - 2*200*200cos(π-θ) = 100 the two forces must be very nearly in opposite directions.
September 12, 2016

science
120g/6mL = 20g/mL
September 12, 2016

Math
.10*100 + .20*89 + .55*82 + .15*81 ≈ 85
September 12, 2016

Calculus
well, I get -114.755 so maybe the key wants -114.76 or -114.8 or -115
September 12, 2016

Calculus
I think you subtracted wrong. Try (f(4)-f(-5))/9 = -114.75 as a quick look at the graph would indicate: http://www.wolframalpha.com/input/?i=3x%5E3-12x%5E2
September 12, 2016

Calculus
L'Hospital's Rule: (1/(1+x^2) - 1)/(3x^2) = (-x^2/(1+x^2))/(3x^2) = -1/(3(1+x^2)) -> -1/3
September 12, 2016

Math
if there are 5x girls and 12x boys, then 17x = 5200 Hmmm. 17 does not divide 5200. Now, if there were 5100 students, then x = 300.
September 12, 2016

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