Monday
December 5, 2016

Posts by Steve

Total # Posts: 46,819

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

Calculus
sin^2(x^2) * 2x
November 18, 2016

Mathematics
"there" not "their" if the road (or walkway) has width w, then the length is 45-2w
November 18, 2016

Calc
f(3) = 27 f(0) = 0 so, the slope of the secant line is 27/3 = 9 So, you need 3c^2 = 9 c = ?3
November 18, 2016

Algebra
four times a number is 4w so, ...
November 18, 2016

math
There are clearly no real solutions, but you can factor it into (x^2-x+1)(x^2+x+1)(x^4-x^2+1) = 0 because x^8+x^4+1 = x^8+2x^4+1 - x^4 = (x^4+1)^2 - (x^2)^2 a difference of two squares Now you can find the roots of those quadratics
November 18, 2016

math
42
November 18, 2016

math
and inept at following instructions, it appears...
November 18, 2016

Order MATH!
2/3 = 0.66 7/10 = 0.70 now things should be clear.
November 18, 2016

maths
the area is just 1/2 ab the area is just 1/2 bc sin?
November 18, 2016

maths
(a) ? is easy, since the angles sum to 180° Then use law of sines to find b,c (b) this is a right triangle. a^2 = b^2+c^2 then just use the trig functions to get the other two angles. (c) use the law of cosines to get any or all of the angles. Or, having one, you can use ...
November 18, 2016

maths
find the reference angle in QI. only sin x is positive in QII. For example, cos x = ?2/2 x = 45° Since cos x < 0 in QII, that is the only solution. Work the others in like wise.
November 18, 2016

Maths
just list the terms. 6 is the last to appear.
November 18, 2016

Maths
Think of a rectangle. The maximal area is achieved when it is a square. Similarly for a rectangular prism, the maximum volume is when it is a cube. so, in this case, the sum is just 3?2001
November 18, 2016

Geometry
#4 Remember the 3-4-5 right triangle. This is just double that. You got #1 right. How could you not be sure on #4?
November 18, 2016

Geometry
#1 ok #2 the sides are 26/?2 = 13?2 If the sides of a square are 1, the diagonal is not 2. #2 In such a triangle, the sides are 1,?3,2 Now multiply everything by 8. (c) is wrong.
November 18, 2016

math
and how did you arrive at that figure? Take a piece of graph paper and draw a 6x8 rectangle on it. You really think the diagonal is 48? Think of the Pythagorean Theorem here.
November 18, 2016

Math
she got 1/6 wrong. so, ...
November 18, 2016

Calc
I assume you mean x^(2/5) since f' = 2/5 x^(-3/5) it is undefined at x=0
November 17, 2016

Calculus
are they the same?
November 17, 2016

Calculus
a = ?(x/2?)^2 + (14-x)/6 * (14-x)/3 P = (12+x)(27-3x) - (4x)
November 17, 2016

calculus
11,33,55,77,99,121,319,517,539,...,979
November 17, 2016

Math
see related questions below
November 17, 2016

mathematics
no idea. Where is D?
November 17, 2016

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