Saturday
December 10, 2016

Posts by Steve

Total # Posts: 47,042

Chemistry
Looks like 205g to me.
November 21, 2016

Maths
My bad. I should have said that when ?=1 we get the equation x^2 + y^2 +4x - 3 + 1(2x^2 + 2y^2 +4x -6y + 3) = 0 3x^2+8x + 3y^2-6y = 0 (x + 4/3)^2 + (y-1)^2 = 25/9 Now the three circles can all be seen to intersect at the same two points: http://www.wolframalpha.com/input/?i=...
November 21, 2016

Maths
When ?=1, we get the circle (x+2)^2 + (y-1)^2 = 5 The three circles can be seen at http://www.wolframalpha.com/input/?i=plot+x%5E2+%2B+y%5E2+%2B4x+-+3+%3D+0,+++2x%5E2+%2B+2y%5E2+%2B4x+-6y+%2B+3+%3D0,+(x%2B2)%5E2+%2B+(y-1)%5E2+%3D+5,+y%3D0,+x%3D0
November 21, 2016

Maths
Solving the system of equations x^2 + y^2 +4x - 3 = 0 2x^2 + 2y^2 +4x -6y + 3 =0 Is the same as solving the system x^2 + y^2 +4x - 3 = 0 ?(2x^2 + 2y^2 +4x -6y + 3) = 0 The equation x^2 + y^2 +4x - 3 + ?(2x^2 + 2y^2 +4x -6y + 3) = 0 can be written as (*) (1+2?)x^2 + 4(1+2?)x...
November 21, 2016

math-mechanics 1
(a) v = 2i (b) r = 2it + (-0.2i+.05j)t^2 (c) we want r to have a zero i component. So, 2t - 0.2t^2 = 0 0.2t (10-t) = 0 t=10 (d) v = 2i + (-.4i+.1j)t we want the i and j components to be equal, so 2-.4t = .1t 2 = .5t t = 4
November 21, 2016

Math
If the tree's height is x meters, the broken tree forms a right triangle with sides 12/25 x and 10. The hypotenuse is 13/25 x. 10^2 + (.48x)^2 = (.52x)^2 Now just solve for x.
November 21, 2016

Math
well, how many months in 4 years? 423 each month...
November 21, 2016

algebra 1
x = 7y/4 + 3/4 y = 4x/7 + 3/7 x = -3y/4 - 7/4 y = -4x/3 - 7/3
November 20, 2016

Math
-1
November 20, 2016

MATH
:DDDDDDDDDDDDDDD
November 20, 2016

MATH
So to restate it in this account that I have been asking the questions and was granted your help. Oh wow that is interesting Ms. Sue and I want to do that with my life also, but sometimes I need some light on how to do these problems. The question I got wrong was a question I ...
November 20, 2016

MATH
Sorry Ms. Sue I had logged on to my account and answered your post on that account but it was really me STEVE as Your best friend
November 20, 2016

MATH
THANKS MS. SUE I got 21/22 questions correct I HATE THAT I WANT 22/22 my mom will get really mad so I have to correct the problem I got wrong before she finds out but thank you for the help for the rest of the questions
November 20, 2016

MATH
3. (5 * 2.25) - (5 * 0.65) = 8 or $8.00 4. Thank you
November 20, 2016

MATH
1.= 3.2*10^6 NOW I JUST NEED HELP WITH QUESTIONS 3 AND 4 Thank you Ms. Sue for all of your help so far
November 20, 2016

MATH
3. THAT EQUATION DOES NOT WORK Ms. Sue IT EQUALS $9.95 AND 9.95 IS NOT AN ANSWER
November 20, 2016

MATH
1. WOW YOU DON'T KNOW, WELL I DON'T KNOW EITHER 2. (2/3) * (1/4) = 1/6 3. (5 * 2.25) - (2 * 0.65) = 9.95 4. A OR B
November 20, 2016

MATH
These are my last few question that I need help with PLEASE STAY WITH ME MS. SUE 1. In 2012, the total population of Florida was 3,158,697 people. What was the population in scientific notation, approximately? A. 3.2 * 10^5 B. 3.2 * 10^6 C. 3.2 * 10^7 D. 32 * 10^7 2. If there ...
November 20, 2016

math
rate of change is (y-change)/(x-change) For the table shown, check each section. The rates from point to point are (70-30)/(15-0) = 2 (0-70)/(23-15) = -70/8 (45-0)/(30-23) = 45/7 (60-45)/(35-30) = 3 absolute values are always positive. So, just compare the positive values ...
November 20, 2016

MATH
No she would so estimated it would be just 2 or B Sorry for the confusion Ms. Sue Thank you
November 20, 2016

MATH
3 * (7/8) = 2 5/8 yards (7/2) / (14/9) = 2 1/4 pieces Thank you Ms. Sue but I don't get you 2nd equation It equals 2 1/4 but that is not an answer choice
November 20, 2016

MATH
1. Serena has 7/8 yd of fabric. To complete her craft project, she needs 3 times that amount. How many yards of fabric does Serena need? A. 2 5/8 B. 2 7/8 C. 3 3/7 D. 3 7/8 2. A length of ribbon is 3 1/2 yd long. How many pieaces 1 5/9 yd long can Joy cut from the length of ...
November 20, 2016

Math
Thanks anyways.
November 20, 2016

Math
So it would Be C
November 20, 2016

Math
Thanks Ms. Sue and Reiny A. 1/3 B. 1/4 C. 1/2 D. 1/8
November 20, 2016

Math
Or 1/2
November 20, 2016

Math
it = 0.5
November 20, 2016

Math
1. Ms. Johnson’s class is having a pizza party. If there are 14 students and 7 pizzas cut into 8 slices, what answer choice represents the fraction of one pizza that each student receives? If someone can give me an equation to solve to get the answer for this. Or Help me ...
November 20, 2016

Math
1. What is 0.68 written as a simplified fraction?
November 20, 2016

Math
32-19=13 32+19=51
November 20, 2016

Math
(x+3)/2 >= (2-x)/-2 x+3 >= x-2 3 >= -2 true for any x
November 20, 2016

math
So, b-c = 10/4 b+c = 5
November 20, 2016

Linear Programming - The Graphical Method
Just graph each boundary line for the constraints, then evaluate the function at each vertex.
November 20, 2016

Calc III
take a look here http://math.stackexchange.com/questions/1572835/finding-the-max-and-min-values-for-a-surface-on-region-r and I think you will be able to get going. Google can also provide many other examples.
November 20, 2016

ST
enter your data here to see the details. http://www.zweigmedia.com/RealWorld/LPGrapher/lpg.html
November 20, 2016

Calculus
work this one just like the last. But time = distance/speed, rather than cost=distance*rate.
November 20, 2016

Calculus
If the cable comes out of the river x meters from the point directly opposite the factory, then the cost is c = 3?(x^2+2000^2) + 1(4500-x) so, find where dc/dx=0 The answer is 4500-x.
November 20, 2016

Math help fast
x^2/2 - 2x = 16 ...
November 20, 2016

Maths
Find where the curves intersect. Clearly, at x=2, since y(2) = 22 = 11*2 I was wondering about the "hence". So, the area in question has two parts. That under the line and that under the curve: a = ?[0,2] 11x dx + ?[2,3.7988] 10+8x+x^2-x^3 dx = 22 + 27.2556 = 49.2556...
November 20, 2016

maths
x^2 - 8x - 20 = 0 (x-10)(x+2) = 0 ...
November 20, 2016

Calculus
x=cos^2t y=ln(sint) dy/dt = cost/sint dx/dt = -2cost sint dy/dx = dy/dt / dx/dt = (cost/sint)/(-2cost sint) = -1/2 csc^2(t) d^2y/dx^2 = d/dx(dy/dx) = d/dt (dy/dx) / dx/dt = (-csct * csct cott)/(-2cost sint) = 1/2 csc^2(t) cot(t) * sect csct = 1/2 csc^3(t)
November 20, 2016

Maths
L1 has slope 0 L2 has slope ?3 see what you can do with that.
November 20, 2016

Math
I assume you meant (5x-2)/4 + 1/2 = (3y+2)/2 (7y+3/3) = x/2 + 7/3 Cleaning things up a bit, you have 5x-6y = 4 3x-42y = -8 See what you can do with that.
November 20, 2016

Math
If it was x, then .4*x + .6*8 = 1.0*6 x = 3
November 20, 2016

Math! Help asap
interesting, since 124 = 4*31 Where did you get the 19? "over by"? Try just "over" Better yet, use real math (5+-[31])/2 Though I have never seen [] used to denote square root before.
November 19, 2016

Math! Help asap
It does not factor over the rationals, since the discriminant b^2-4ac = 100+24 = 124 is not a perfect square. Use the quadratic formula to find the roots, or maybe there's a typo.
November 19, 2016

math
http://www.jiskha.com/display.cgi?id=1479538720
November 19, 2016

math
5*2x - (4x+6x) Looks like a zero profit.
November 19, 2016

algebra
Nope. You correctly got that x-(-3) = x+3 Work y the same way.
November 19, 2016

Algebra, 8th Grade mathematics
note that x^2-1 = (x-1)(x+1) x^3-1 = (x-1)(x^2+x+1) x^4-1 = (x-1)(x^3+x^2+x+1) so, 3^251-1 = (3-1)(3^250+3^249+...+3^1+1) So your sum is just (3^251-1)/(3-1)
November 19, 2016

Maths
each minute mark is 1/60 of a circle for the minute hand: 6° So, the minute hand has gone 37*6 = 222° around. In the meantime, the hour hand, starting at 2:00 (60° along its path), has advanced another 37/60 * 1/12 = 37/720 of a circle. So, the hour hand has moved ...
November 19, 2016

FUNCTIONS HELPPPPP????
The g(x) I suggested was a last-ditch effort to come up with some function using f1,f2,f3. You repeatedly refused to specify what you meant when you said Determine an equation for this function "this function" indicates that there is some function you want to create ...
November 19, 2016

math
43C9 = ?
November 19, 2016

math - business
highest profit is at the vertex, when x = -b/2a = 4/.01 = 400 P(400) = 600
November 19, 2016

algebra/pre-calc - please help
If we use x as the number of days since the start of the year, build each piece with a y=mx+b section, where the price starts a t b and the line has slope m ($/day) January is y = 10 + 2/31 x February is 12 - 3/28 (x-31)
November 19, 2016

blah blah blah
a+b=15 10b+a = 10a+b - 27 69 = 96-27
November 19, 2016

math
what, you can't plug in h=1 or h=6? and online you write 5e^(-0.4h)
November 19, 2016

algebra
.40*.80 = .32 so, .20x = .18 x = .9 so, win 90% of the remaining games.
November 19, 2016

Algebra 2
well the slope is -3/4, and the point slope is y-k = m(x-h) so plug in your numbers. It does not matter which point you choose for (h,k).
November 19, 2016

algebra 2
usually a complex number is written a+bi, and coefficients come before variables. I know it is tempting to put the ?5 last so it does not get confused with following numbers, but that's just orthography. here, a is zero, so just bi: 6?5 x^4 i
November 19, 2016

algebra 2
me too Usually the i comes last, though.
November 19, 2016

math
I recall such rates in about 1964, but it was, of course, compound interest.
November 19, 2016

Pre-calculus
This one is easier if you work on the right side. (sin(x-y)/cos(x-y)) / (sin(x+y)/cos(x+y)) (sinxcosy-cosxsiny)/(cosxcosy+sinxsiny) ------------------------------------- (sinxcosy+cosxsiny)/(cosxcosy-sinxsiny) Expand those products, and you will be able to factor out some (sin...
November 19, 2016

Physics
none, except against air resistance. For a given force at takeoff, the mass affects the acceleration.
November 19, 2016

Math
Think about y=x^2 x can be either plus or minus and produce the same y value. Sp, as y grows on one side of the axis, it also grows on the other side. Plot a few points.
November 19, 2016

java program
you mean display the code? Surely the payroll system displays its own information.
November 19, 2016

Algebra
well, 3n^2+5n-100 = (3n+20)(n-5)
November 19, 2016

maths
AC = 1/2 AB PC = 1/2 AC = 1/4 AB
November 19, 2016

Math
81 = 3*27 so, the number is 4*27
November 19, 2016

math
if the scale factor is s, then P2/P1 = s A2/A1 = s^2
November 19, 2016

Maths
You can start here. Once you know the side length of the triangle, you can get its area. https://owlcation.com/stem/Inscribed-Circles-and-Equilateral-Triangles-7-Hard-Geometry-Problems-and-Solutions
November 19, 2016

math
If the %ages are based on the gross, then she saves (628-148.90-628(.045+.08))*.10 = $40.06 If they are based on after-tax income, then she saves (628-148.90)(1-(.045+.08)))*.10 = $41.92
November 18, 2016

Precalculus
D: all reals R: all reals > 0
November 18, 2016

chemistry
f" = -36sin(6x) f' = 6cos(6x)+c f'(0) = 6+c = -5, so c = -11 f' = 6cos(6x)-11 f = sin(6x)-11x+c f(0) = c = -3 f = sin(6x)-11x-3 f(?/3) = sin(2?)-11(?/3)-3 = -11?/3 - 3
November 18, 2016

Math
boy, you don't give much away, do you? The average value is ?[a,b] f(x) dx ------------------     b-a So, what didn't work? ?[-1,2] 4x^3-3x^2 dx = x^4-x^3 [-1,2] = (16-8)-(1+1) = 6 6/3 = 2 So, where is f(x)=2? 4x^3-3x^2=2 x ? 1.137
November 18, 2016

Math
see the related questions below. Just use your function instead.
November 18, 2016

English
#1 means that you are in sustained flight higher than the clouds #2 implies that in a while you will come back down, as in "The cow jumped over the moon." #3 Lots of explanations online. You might start here: http://www.grammarbank.com/impersonal-pronouns.html
November 18, 2016

Calc
http://www.jiskha.com/display.cgi?id=1479256552
November 18, 2016

Math help please
yes
November 18, 2016

Math help please
geez -- impatient much?
November 18, 2016

Math help please
TeX is not much good here, as you can see.
November 18, 2016

Math help please
a pizza place charges $5 per pizza, with a $7 delivery fee. How much does a delivery order for x pizzas cost?
November 18, 2016

math
try just posting a problem without copying all the surrounding text, eh? Don't make us figure out the question as well as the answer. Clean it up and post it again. Maybe just one question. Learn from its solution and try more on your own.
November 18, 2016

Math
If the length is x, then 2(x + 2x-8) = 104
November 18, 2016

Math
since y=2x-5, 4x-(2x-5) = 7 Now solve for x, and then you get y.
November 18, 2016

Maths
The yacht should take a bearing of the harbour, and then sail on that heading. Not sure what 065T means, but I assume it's 65° clockwise from True North. If so, then the heading back to the harbour is found via Label the diagram as follows: H = harbour P = point of ...
November 18, 2016

Physics
conserve momentum: 3500(45) + 1600(-25) = (3500+1600)v
November 18, 2016

Functions
so, what is your work? Show how you did it.
November 18, 2016

Functions
Oh come on. Just plug in their definitions: g(x) = f2(x)-f3(x) = (1/8(x+16)^2-98)-(2x+24) = 1/8 x^2 + 2x - 90 f1(x)=0 is stupid, as it contributes nothing.
November 18, 2016

Functions - huh?
Determine an equation for this function WHICH function?
November 18, 2016

Calculus
the chain rule says that d/dx(fg) = f'g + fg' not f'*g'
November 18, 2016

Calculus
clearly, y(0) = 4 y'(0) = 0 So, a parabola with vertex there will work: y = 2x^2+4 or how about a cosine function? y = 4cos(x)
November 18, 2016

math
In standard form, x^2/9 + y^2/4 = 1 a = 3 b = 2 c = ?5 You are correct that the foci are at (±?5,0) The directrices are at x = ±a^2/c = ±9/?5
November 18, 2016

math
Clearly the distance z between the ships can be found using z^2 = (Ax-Bx)^2 + (Ay-By)^2 = (-t+20)^2 + (-2t+10)^2 = 5t^2 - 80t + 500 2z dz/dt = 10t-80 dz/dt = 0 when t=8. So, just evaluate z at t=8.
November 18, 2016

Algebra
#1 clearly A grows by 0.6 for each new term. suppose A(n) = 0.6(n-1) But, when n=0, A(0) = 0.3 so just add that at the start. A(n) = 0.6(n-1) + 0.3 #2 A(n) starts at 47 and drops by 15, so start with A(n) = 47-15(n-1) The (n-1) stuff pops up because the first term (n=1) has ...
November 18, 2016

math
oops. That gives the untranslated parameterization. You want to shift things, so x = sec(t)/3 - 2 y = 4tan(t) + 4 so that 9(x+2)^2 - (y-4)^2/16 = 1
November 18, 2016

math
you know that sec^2(t)-tan^2(t) = 1 so, let x = sec(t)/3 y = 4tan(t)
November 18, 2016

Math
just compare cost/volume
November 18, 2016

Math
a = pi r^2 da = 2pi r dr now just plug in your numbers.
November 18, 2016

Calc
Graph the function. The area is just a couple of triangles.
November 18, 2016

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