Wednesday
September 28, 2016

Posts by Steve

Total # Posts: 44,202

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

maths
yep
September 12, 2016

Maths
well, 25tanx = 17cosy, so see what you can do with that.
September 12, 2016

Math
what, no ideas of your own? at all? none?
September 12, 2016

Math
1: 5.310 5: 101.1 now you try the others. we'll check your results
September 12, 2016

Math
c = πd love your creative syntax
September 12, 2016

maths
ok, now what?
September 12, 2016

Math
a = (17-8)/3 = 3 m/s^2 s = vt + a/2 t^2
September 12, 2016

Math
Well, just plug in n=101! (101+1)x+(-1+2(101-1)) = 102x + 199
September 12, 2016

math
(n+1)x + (-1 + 2(n-1))
September 12, 2016

Math
no clue. no info.
September 12, 2016

algebra
yes
September 11, 2016

a
No idea where the u and z came from, but the -8x-3y is ok
September 11, 2016

maths
here's a nice linear algebra solver: http://www.zweigmedia.com/RealWorld/LPGrapher/lpg.html
September 11, 2016

Math
use the law of cosines. The included angle is 50°
September 11, 2016

physic
at time t they will be at the same height, when 17-4.9t^2 = 23.5-7.36t-4.9t^2 use that t to get the height since gravity affects both balls equally, their speed difference is constant.
September 11, 2016

4th grade math
21,849 + 38,932 ≈ 20,000+40,000
September 11, 2016

Math
90-105 = ?
September 11, 2016

Precalculus
xy = 172 x = 2y-8 solve for x and y, and then the diagonal is √(x^2+y^2)
September 11, 2016

Math
5 1/6 = 30/6 + 1/6 = ?
September 11, 2016

ALGEBRA
If there are x ml of 20% then the rest (100-x) is 40%. So, add up the acid in the parts; it must equal the acid in the result: .20x + .40(100-x) = .24*100 and that's liters, not leters. When you get your answer, note that 24% is 1/5 of the way from 20 to 40, so 1/5 of the ...
September 11, 2016

Math
y-x = 20 (x+y)/3 = 40
September 11, 2016

college
60 rev/min * 2π rad/rev = 120π rad/min the linear speed is just radius * angular speed 120π/min * 15in * 1ft/12in * 1min/60s = (120π*15)/(12*60) ft/s
September 11, 2016

math
First step: distributive 6x-8 = 8x-11 now what?
September 11, 2016

Math
Tn must surely be (n+1)x + (-1 + 2(n-1)) = (n+1)x + 2n-3
September 11, 2016

math
note that S increases by 5 for every +1 change in N.
September 11, 2016

Math
exactly reversed. How can you possibly add two positive numbers and sometimes get a negative result???
September 11, 2016

Algebra
y = mx+b 21m+b = 58 43m+b = 42.6 Solve for m and b, and then figure y when x=59. Or, note that 22 minutes of driving covered 15.4 miles. So, after 16 more minutes, he covers (16/22)(15.4) more miles. Subtract that from 42.6
September 11, 2016

Algebra 1 Foundation Concepts rewrite
6 B,C http://www.virtualnerd.com/algebra-2/equations-inequalities/real-numbers/number-types/natural-and-whole-numbers-definition Surely your text explains all this.
September 11, 2016

Math
(a) 10(+0.30) = +3.00 That's my work so far. Have any of your own?
September 11, 2016

Math Trigonometry
use the law of cosines. The included angle is 50°
September 11, 2016

Mathematics
(b) clearly d=4, since T16-T8 = 8d = 32 Now do (a) and (c) For (c), note that T20-T16 = 4d
September 11, 2016

Math Trigonometry
actually, if you draw the parallelogram, you will see that you have the wrong diagonal. R^2=22^2+35^2-2*22*35*cos(180-52) If the vectors are u and v, you want |u+v|, not |u-v|
September 11, 2016

Trig
use the law of cosines. The included angle is 50°
September 11, 2016

Math
you have a problem balancing your grouping symbols. How did you get 14?
September 11, 2016

Math
-2+3[6-(1-9)] -2+3[6-(-8)] -2+3[6+8] -2+3[14] -2+42 40
September 11, 2016

Math Domains
You know that you cannot take the square root of a negative number. That means that you must have x(x-2) >= 0 So, either both factors are negative, or both are positive. Thus, the domain is (-∞0]U[2,∞) You can visualize this by graphing the parabola. It opens ...
September 11, 2016

Math
Your math is correct, but your choice is not Think of (1/2) as a unit, like books, dollars, etc 9 of them divided by one of them is 9 9/2 km is the goal 1/2 is each trip So, 9 is the number of trips needed to reach the goal: (D)
September 11, 2016

Math
note that (p-q)^2 = p^2 - 2pq + q^2
September 11, 2016

algebra
what, reposting after only 3 minutes? impatient much?
September 11, 2016

math
a little synthetic division shows 4x^2-10x+21 R -41
September 11, 2016

math
(3rd)^2 = 9 rd^2
September 11, 2016

College Algebra
by steadily, do you mean it rises by the same amount each year or it rises by the same percent each year ?
September 11, 2016

Algebra
well, it appears to drop 400 each time. So, what does that tell you?
September 11, 2016

Math
divide by 2 and you have 3/2 cm : 1m
September 11, 2016

math
or x40
September 11, 2016

maths
There sure is a lot of gobbledegook there. If we say that the center lies on the line x = 2t-1 y = 3t+1 Apparently the center of the circle lies on the line y = (3x+5)/2 The circle passes through (-3,-1) So, we need (-3-h)^2 + (-1-(3h+5)/2)^2 = 100 h=3 or -105/13 so, k= 7 or -...
September 11, 2016

Calculus
I assume you meant to ask: How fast is the shadow moving on the wall, when the distance from the man to the center of the courtyard is 1/2 r Let's set this up in polar coordinates. Let's call the radius a, so we can use r as a function of θ. Set the light at the ...
September 11, 2016

Math
64.4/20 * 100 cm
September 11, 2016

Algebra
1/30 + 1/25 = (5/6)/x
September 11, 2016

Math
sin(kx) has period 2π/k the other requires some numeric or graphical techniques: But you know it will be somewhere near x=25, since |sinx| <= 1 and 25-x=0 at x=25 http://www.wolframalpha.com/input/?i=25+%E2%88%92+x+%E2%88%92+sin(x)
September 11, 2016

Math
1. What is one period of the function f(x) = 120 sin(120πx). 2. When does f(x) = 25 − x − sin(x) cross the x-axis?
September 11, 2016

Algebra
Ah, I think you mean f(x) = a * b^x I guess that means a/b^3 = 30 ab^1 = 13 Is that anywhere near what is wanted? If not, can you explain a bit, or give a pointer to examples of this notation?
September 11, 2016

algebra
If it is a multiple of 9, its digits must add to a multiple of 9. I think you are missing a dash, since it cannot start with 6 and end with 5 and be a palindrome.
September 11, 2016

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