Sunday
December 4, 2016

Posts by steve

Total # Posts: 46,790

maths need help
log_9(a+3)-log_9(b) = c + (1/2) log_3(a-3)+log_3(b) =c - 1 (a+3)/b = 9^(c+1/2) (a-3)b = 3^(c-1) (a+3)/b = 3*9^c (a-3)b = 3^c/3 a+3 = 3b*3^(2c) 3(a-3)b = 3^c 3(a+3)(a-3)b = 3b*3^(3c) a^2-9 = 27^c a^2 = 9+27^c I expect you can get the rest.
November 22, 2016

Maths
well, since y=15-2x^2, just solve 3x+9(15-2x^2) = 1 18x^2 - 3x - 134 = 0 now just use the quadratic formula
November 22, 2016

Math
you sure you don't mean a^4 - 13a^2 + 36 ? let u = a^2 and try factoring u^2-13u+36 which two factors of 36 add to 13?
November 22, 2016

maths
The diagonals bisect each other, and also meet at an angle of 125°. So, the long side of the parallelogram can be found using the law of cosines. Let the parallelogram be ABCD and the center be E. AB^2 = 3^2+4^2 - 2*3*4*cos125° AB = 6.2262 Now, the altitude of triangle...
November 22, 2016

maths
(6/2)^2 * h = 2/3 (15/2)^3 h = 125/4
November 22, 2016

Maths
Hmmm. what two factors of 36 add to 13? Try factoring u^2-13u+36 and let u=x^2
November 22, 2016

Calculus
let u = cos(3x) and see what happens
November 22, 2016

Calculus
Good luck with this - an elliptic integral.
November 22, 2016

Math
well, there are 60 minutes in an hour, so just divide by 60. Hint -- it is not 56 mi/min
November 22, 2016

Math
Take a look here, and all will become clear. https://in.answers.yahoo.com/question/index?qid=20130823004513AAdmLmh
November 21, 2016

Math
If the roots are p and rp, then you have b/a = -(p+rp) c/a = p*rp see what you can do with that
November 21, 2016

Physics- Equilibrant Force
The resultant force is 71 NE So, the equilibrant force is 71 SW
November 21, 2016

Physics- Accleration of a Falling Penny
if the force increases (more upward) the the net downward force must decrease. So, (a) since F=ma
November 21, 2016

algebra
how about fixing the formatting?
November 21, 2016

dav chd
let x = w-1 x^4-4x^3+2x^2+4x+4 = (w+1)^4 - 4(w+1)^3 + 2(w+1)^2 + 4(w+1) + 4 ...
November 21, 2016

Econ math/logarithms
8 = 2^3 log8 = 3 log2 = 3*0.39 = 1.17
November 21, 2016

Gauss-Jordan elimination
fix your typo and visit http://www.gregthatcher.com/Mathematics/GaussJordan.aspx for all the details
November 21, 2016

Calculus
You know that lim sinu/u = 1 so, lim tanu/u = 1 (because lim cosu = 1) So, lim tan(7x)/x = lim (tan(7x)*7)/(7x) = 7 lim tanu/u where u7x = 7 or, using L'Hospital, lim tan(7x)/x = lim (7 sec^2(7x))/1 = 7
November 21, 2016

Trig
You know that the standard parabola x^2 = 4py has focus at (0,p) and directrix at y = -p. Your parabola has been shifted so its vertex is at (-2,6). 4p=8. So, the focus is 2 above the vertex and the directrix is 2 below the vertex.
November 21, 2016

math
Let the printed area xy=50 The total area is a = (x+2)(y+4) = (x+2)(50/x + 4) = 4x + 58 + 100/x so, find where da/dx = 0 (and x>0)
November 21, 2016

math
it is the slope of the line joining (1,f(1)) and (2,f(2)): (1,20/4) and (2,20/16) (20/16 - 20/4)/(2-1) = ?
November 21, 2016

Math
s shares at price p gives sp = 308 (s+6)(p-3) = 308 sp+6p-3s-18 = 308 308+6p-3s = 18 2p-s = 6 2p - 308/p = 6 2p^2 - 6p - 308 = 0 p^2 - 3p - 154 = 0 (p-14)(p+11) p = 14 s = 77
November 21, 2016

science
work = force * distance
November 21, 2016

Math
2,47
November 21, 2016

Math algebra
If the quicker person takes x hours, then the slower person takes 3x hours. 1/x + 1/3x = 1/4 12+4=3x x = 16/3 so, 3x = 16 hours for the slowpoke.
November 21, 2016

Math
looks good to me
November 21, 2016

Chemistry 20
Zn + CuSO4 = Cu + ZnSO4 same number of moles of each
November 21, 2016

Math
since column 1 is the one-times column, the row must be 4.
November 21, 2016

Physics
(a) v^2 = 2.5^2 + 4.5^2 (b) 2.5 (c) 4.5
November 21, 2016

Maths help asap please.
think: (a+1)^2 = a^2+2a+1
November 21, 2016

math
the + or - status does not matter. Just find the rule as usual.
November 21, 2016

maths
t = u+2 (10t+u) + (10u+t) = 88
November 21, 2016

Physics
well, 5min = 1/12 hr. Now use the hint.
November 21, 2016

Algebra pt. 2
That's better, but express them a as pair of coordinates. (12,4) not just 12 4.
November 21, 2016

maths
x+24 + 10 = 3(x+10)
November 21, 2016

Algebra
NO Take each point and double its coordinates. Stop trying to get rid of the coordinates. The problem says to come up with a new list of coordinates for the expanded diagram. (6,2) becomes (12,4)
November 21, 2016

Algebra
No, you multiply each coordinate by the scale factor: 2 That's what the scale factor is for. what can it possibly mean to multiply x-values by y-values? You are trying to convert a point into a number. Bogus...
November 21, 2016

mathematics
what? reposting after just 5 minutes?
November 21, 2016

maths
well, 6 = 72/12, so ...
November 21, 2016

Mathematics
Let the ages of France, Emma, Father be x,y,z. Then we have x = 2y x+y = z-12 z=30 So, start substituting till you can find y.
November 21, 2016

Algebar
you have a difference of two squares a^2-b^2 = (a-b)(a+b) where a = 9x^3 b = 5y^5 Now just plug and chug.
November 21, 2016

math
chain rule: (a) 4(x^2+1)^3 * 2x (b) not sure what you mean by "primitive" The extrema (max and min) can be found where 8x(x^2+1)^3 = 0
November 21, 2016

maths
22.5
November 21, 2016

Math
x-21 = 71-x
November 21, 2016

motion
Take a look at this example. It is very similar to yours. http://www.a-levelmathstutor.com/m-momimp-coeffrest.php
November 21, 2016

Math, Surds @Reiny got it
My bad. I read "diagonal" not "area"
November 21, 2016

Math, Surds
s = 60/?2 = 30?2 m well, a square has 4 sides, so ...
November 21, 2016

math
m-1/m ... what? I will say, however, that (m-1)^2/m^2 = ((m-1)/m)^2 (m^2-1)/m^2 = (m-1)(m+1)/m = (m-1)/m * (m+1)
November 21, 2016

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

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