Friday
May 29, 2015

Posts by STEVE


Total # Posts: 31,431

SOLVE -MATH
9C6 * 6C3
April 30, 2015

physics
we have, since the focal length is constant, 1/f = 1/20 + 1/x = 1/16 + 1/(x+2.7) Just solve for x, and then find f.
April 30, 2015

Calculus
good work. Confirm with the graphs at http://www.wolframalpha.com/input/?i=plot+x%5E2%2B3x%2B2%2C+y%3D3x%2B2+for+-1+%3C%3D+x+%3C%3D+1
April 30, 2015

maths
you have a common ratio, so p/-6 = -32/p p^2 = 192 ...
April 30, 2015

math
No, P(black) = 9/10 1 - 9/10 = 1/10 B is the odds of drawing a white, not the probability.
April 30, 2015

Physics
1A is 1C/s You have 73mC/9s = 8.11mA the net charge is not relevant here, since all we need is the number of Coulombs.
April 30, 2015

MAT 142
keeping all the measurements in yards, (15/3)(8/3)(8/36)($30)
April 30, 2015

Math
clearly you can drop the trailing zeros, getting 504/5940 both are even, so you can factor out 2 top and bottom: 252/2970 and again: 126/1485 now 3's: 42/495 and again: 14/165 That's as far as you can go. Or, you can factor both numbers. 5040 = 2^4 3^2 5 7 59400 = 2^3 ...
April 30, 2015

Math
(8*7)/2 - π/4*3^2
April 30, 2015

math
hmmm. None of the polynomials factors over the reals, so I don't see any help there. Looks like GCF=1 and LCM = (1+4x+4x^2-16x^4)(1+2x-8x^3-16x^4)(16x^4+4x^2+1) if x=-1 we have -17,-7,21 x=0 we have 1,1,1 x=1 we have -7,-21,21 x=2 we have -231,-315,273
April 30, 2015

math - eh?
what's with the .. ?
April 30, 2015

Math
first expand: 4x^3y+30x^2y-35xy^2-72x^2y+80xy^2-11xy^2 then combine: 4x^3y-42x^2y-34xy^2
April 30, 2015

Math
(4)(14)+(-1)(3)+(-6)(8) = 56-3-48 = 5 Pretty grim score, eh?
April 29, 2015

English
What do you do when the author can't be found? How do you cite the book? Would use just the title of the book or explain that the info is missing?
April 29, 2015

English
what should you do if you need to cite a book for which you don't know the author?
April 29, 2015

Algebra 2
multiply through by 8x and you have 2(x+2)-3(4) = x 2x+4-12 = x x = 8 check: 10/32 - 3/16 = (10-6)/32 = 4/32 = 1/8
April 29, 2015

Math
to be a perfect square, all its prime factors must be squared. Since 7 occurs an odd number of times, 7^2 cannot divide the number. So, no, it is not a perfect square. It is almost a perfect square, though, since 2^6 * 3^10 * 5^12 * 1^18 = (2^3 * 3^5 * 5^6)^2
April 29, 2015

Math
6789 = 3*31*73 since 3,31,73 all divide the first term, and 6,62,146 all divide the second term, 6789 divides both terms, and thus the sum as well.
April 29, 2015

Math
all the powers must be a multiple of 3. So, it is a perfect cube. It is (2^3 * 3^4 * 5^2 * 7)^3
April 29, 2015

MATH
d = 7n 10d = 650+5n 10(7n) = 650+5n 65n = 650 n=10 so, d=70
April 29, 2015

Molar mass
so, what steps did you follow? If you want help with your error, show your work...
April 29, 2015

Mathematics
just plug and chug: 148225 - x^2 = 578132.1225 - 406278.76 + 1274.8x - x^2 x = -18.535
April 29, 2015

pressure
PV=nRT Just plug in your numbers and solve for P.
April 29, 2015

math
440x220 with the 440' side parallel to the river. the related questions below provide steps for the solution.
April 29, 2015

Math
if it is a perfect square, all of its prime powers will be even. Since if you have (2^a 3^b 5^c ...)^2 all the exponents are doubled.
April 29, 2015

math: fundamental counting principal
12*10*7*5
April 29, 2015

math; solve problem
the simplest solution is 32.2*21/13.65
April 29, 2015

Math
The problem is poorly worded. Why don't you draw a diagram, and tell us what the relevant points of reference are?
April 29, 2015

MATH; STANDARD DEVIATION
you can plug in your numbers and play around with Z table stuff at http://davidmlane.com/hyperstat/z_table.html
April 29, 2015

Algebra
y=0 at x = -1 for x > -1, y is increasing
April 29, 2015

Pressure
PV=kT, so P/T is constant Figure the increase in T (as a factor), and apply that same factor to P to keep the ratio constant.
April 29, 2015

Math Help
what, you can't plug in values for n? a1 = 1(1^2-6) = 1(-5) = -5 a2 = 2(2^2-6) ... a1=14 a2 = (-2)(14) = -28 a3 = (-2)(-28) ...
April 29, 2015

Math
GCF=1 LCM=pq
April 29, 2015

math
3x2 + 3x5 = 6+15 = 21 8x3 = 18 So, he needs more canvas than he has. Or, you could line up the two desired pieces, and he needs one large piece 3x(2+5) = 3x7, but his piece is only 3x6.
April 29, 2015

algebra NEED HELP
√(x-5) is always positive. So, there is no solution √(2-7x) = 2x 2-7x = 4x^2 4x^2+7x-2 = 0 (x+2)(4x-1) = 0 so, x = -2 or x = 1/4 But since √(2-7x) is positive, x = -2 is an extraneous solution So, x = 1/4 is the only solution
April 29, 2015

algebra
since y=kx, y/x is constant. Thus, 14/21 = 7/x
April 29, 2015

Calculus and Vectors
the resultant is <900/√2,-900/√2 + 100> Now just find the speed and direction.
April 29, 2015

Calculus
They span R2 if they are independent. That is, the 2nd is not a multiple of the 1st. So, what do you think?
April 29, 2015

Math help Steve?
right on
April 29, 2015

Math
well, you need 3x+4 = 16 or 3x+4 = -16
April 29, 2015

Last week Help Math
now way to tell about the median and mode, but the mean is changed from (10*10000)/10 to (9*10000+20000)/10
April 29, 2015

Calculus
Draw a diagram of the forces. tanθ = 76/220
April 29, 2015

Math (check answers)
#1 Nope (C) is (x+3)(x-1)(x-5) You want (x+3)(x+1)(x-5) #2 Nope There are a total of 11 votes, so for is 7/11 = 64%
April 29, 2015

Math help!
If the vertical lines have length y, and the horizontal sides have length x, then 3y+2x = 270 and the total area is a = xy = x(270-2x)/3 = 90x - 2/3 x^2 This is just a parabola with vertex at (135/2,6075/2), so the total area is 6075/2. Since x=135/2, y=45 Since the inside ...
April 29, 2015

Calculus-limits
take derivatives top and bottom. The desired limit is the same as the limit of (cosx-0)/1 = cosx Now take the limit as x->a so, (b) is the answer.
April 29, 2015

math
is that 13 in high? Presumably the circular top has the same circumference as the cylinder.
April 29, 2015

math
(a+36d)/(a+20d) = 7/4 (a+64d)/(a+36d) = 7/4 3a=4d looks like there are many such sequences: a=12, d=9 T21 = 192 T37 = 336 T65 = 588
April 29, 2015

Algebra
the angle is x, where tan(x) = 2/(30*12)
April 29, 2015

Mathh
note that y grows by 3 when x grows by 1. That means you can start with y = 3x But since y(0)=1 instead of 3*0=0, y = 3x+1
April 29, 2015

Calc 1
If the triangle has side x, then the area a = ((11-3x)/4)^2 + √3/4 x^2 That's just a parabola. Its vertex will be the minimum area. For maximum, check to see which is greater: a(0) or a(11).
April 28, 2015

math
do you know how to calculate the length of a helix? The radius is 2/π, so we have x = 2/π cos θ y = 2/π sin θ z = 15/4π θ 0 <= θ <= 8*2π
April 28, 2015

calculus
dy/dx = y^2/x^3 dy/y^2 = dx/x^3 -1/y = -1/(2x^2)+c y = 2x^2/(1-cx^2) what's with all the verbal noise? You want to discuss y' = 2x√(1-y^2)? Just say so dy/√(1-y^2) = 2x dx arcsin(y) = x^2 + c y = sin(c+x^2)
April 28, 2015

Geometry
the front wheel makes 6/10 of a turn for every turn of the rear wheel. So, the pedals move (6/10)*2pi*7 inches during that time.
April 28, 2015

math
.5L/s * 3.7gal/L * 3600s/hr = ? gal/hr
April 28, 2015

Calculus
f(x) = ax^2 + 1/3 for x >= 1 bx - 10/3 for x < 1 so, we need f(1) to be consistent. That is, a + 1/3 = b - 10/3 we also need f'(1) to be consistent: 2a = b so, a + 1/3 = 2a - 10/3 a = 11/3 b = 22/3 a+b = 11
April 28, 2015

Math help
well, what is (3√2)^3 ?
April 28, 2015

Calculus
actually, I misspoke. You want p when h=8200, so p(8200) = 101.3 e^(-.000151*8200) You should have caught that typo...
April 28, 2015

Calculus
dp/dh = kp dp/p = k dh ln p = kh+c p = c*e^(kh) p(0)=101.3, so c=101.3 p(h) = 101.3 e^(kh) p(1000) = 87.1, so 101.3 e^(1000k) = 87.1 1000k = ln(87.1/101.3) k = -.000151 p(h) = 101.3 e^(-.000151h) so, now solve for h when p = 8200
April 28, 2015

Calculus
120 sin 25° think about it -- a horizontal force (0°) does no lifting, and an upward force (90°) is all lift.
April 28, 2015

Physics - Half Life Question Check!!!
The amount left after t billion years is (1/2)^(t/1.25) So, you want (1/2)^(t/1.25) = 0.77 t/1.25 log 0.5 = log 0.77 t = 1.25 log(0.77)/log(0.5) = 0.471 Looks like (B) to me.
April 28, 2015

Geometry
a = 1/4 √3 (36/3)^2
April 28, 2015

Algebra Word Problem
if there are x price increases, the revenue is (95-x)(100+x) That is just a parabola. Its vertex represents maximum revenue.
April 28, 2015

Calculus
your logic and your answer are correct.
April 28, 2015

Calc
wold that not be just the integral of C' from 3500 to 8500? Just use the power rule for each term.
April 28, 2015

Calculus help??
f(x) = ∫[0,x] 2πu du df/dx = 2πx you are correct. I suspect that those choices belong to a different problem, or that there is a misprint in this one.
April 28, 2015

Calculus I
The question is, how many can you sell at $10? Let's say it's 1000. Then if there are x price reductions, you can sell 1000+500x So, the revenue will be (1000+500x)(10-x) The cost is 3000+2(1000+500x) profit is revenue - cost. Use your real value instead of 1000, and ...
April 28, 2015

Math Check
both right
April 28, 2015

Math Check
Both look good to me.
April 28, 2015

math
the left side is also just a difference of two squares, so ((a-3)+(a-2))((a-3)-(a-2)) = (2a-5)(-1) so, you have 5-2a = 5 a = 0
April 28, 2015

Math
it's a problem in exponential growth similar ones in exponential decay are things like radiocarbon dating, where the amount of carbon-14 diminishes each year by a certain small percentage.
April 28, 2015

Math
after t minutes, there are 2^(t/15) bacteria. So, find t when 2^(t/15) = 10000 t/15 log2 = log10000 t = 15 * (log10000/log2)
April 28, 2015

math
if the side of the base is s, then you know that 10s^2 = 810 The total area is the base (x^2) and 4 sides, each of area 10x.
April 28, 2015

math
the base is 18*18 each side is a triangle of base 18 and height 12, so the faces have area 4*(18*12/2) SO, just do the math.
April 28, 2015

Algebra
3x = 7*8/21 x+2 = 5*20/10 That should get you started
April 28, 2015

math
v = Bh so, 9B = 2025
April 28, 2015

chemistry
You Can Get Your All Chemistry and other subjects questions Solved just Visit: http://www.myassignmenthelp.net/data-structure-assignment-help.php
April 28, 2015

5th grade (math)
the difference between two numbers is found by subtraction: 13 1/10 - 12 1/2 = 12 11/10 - 12 5/10 = 6/10 or 3/5
April 28, 2015

math
v = 40mm * 25mm * 2mm = 2000 mm^3 so, the weight is 2000 mm^3 * .0005oz/1mm^3 = 1oz
April 28, 2015

English
In Edgar Allan Poe’s poem “The Bells,” how does the tone change from the beginning to the end? from melancholic to scary from cheerful to sinister from peaceful to frenetic from hopeful to embittered
April 28, 2015

English
"The Cask of Amontillado" Poe's use of a(n) _________________ narrator to tell the story heightens the uncertainty and sense of horror felt by the reader.
April 27, 2015

College Algebra
well of course the vertex is the maximum area. The parabola represents the area, right? And you are correct in your final answers, with the exception that when x=200 and y=125, 4xy = 4*200*125 = 100,000
April 27, 2015

College Algebra
well, if each pen is x by y, then the vertical lines have length x, and the horizontal lines have length 4y, then we know 5x+8y = 2000 then the area is a = 4xy = 4x(2000-5x)/8 = 1000x - 5/2 x^2 This just a parabola, and its vertex will be the maximum area. Work it out, and you...
April 27, 2015

Math
sums are terms separated by + or - signs products consist of two or more factors multiplied. So, what do you say?
April 27, 2015

math
then
April 27, 2015

Inequalities Interval Notation
After you get a bit of practice with this kind of stuff, you can feel confident using what you know about the graphs of polynomials. (2 + x)(5 + x)(4 - x) < 0 You know this is a cubic, with three roots. The graph crosses the x-axis at each root. So, pick a very large ...
April 27, 2015

Math help!
of course the are will be minimum if the width of length is zero. But that's not what you want, I'm sure. So, you want the arrangement of fences which will produce the maximum area. You don't say how the area is to be divided. Is the beet garden enclosed by the ...
April 27, 2015

science
Try To find Your Answers at below Link http://www.myassignmenthelp.net/chemistry-assignment-help.php
April 27, 2015

math
#1-3 are very poorly worded. Whoever phrased them like that ought to be shot. #1 x and y have equal rates of change #2 y has the greater rate of change. #3 clearly y changes faster. Heck, they told you that in just so many words. #4 ok #5 you gave the values for y=x^2 But the ...
April 27, 2015

C++ Programming
why don't you google C++ and some of those key concepts? You will find many code snippets illustrating the syntax.
April 27, 2015

Math
the average rate of change is just f(π/8)-f(π/10) ------------------- (π/8 - π/10) Now just plug and chug. It's just the slope of the line joining the two points on the curve.
April 27, 2015

Math
the divisor is a factor if the remainder is zero Just as you know that 5 is a factor of 35 because 35/5 has zero remainder. For example, (2x-1)(x+2)(3x+7) / (x+2) = (6x^3+23x^2+15x-14)/(x+2) we know that the remainder is zero, because we constructed it that way. To make that a...
April 27, 2015

AP Calc B/C
we are told that p doubles every 35 years. That means p = Po * 2^(t/35) Each year it increases by a factor of 2^(1/35) = 1.02, or 2% per year.
April 27, 2015

Calculus
The curves intersect at x = ±1.18. So, using symmetry, the area is a = ∫[0,1.18] cos(x) - (x^2-1) dx Those are all easy integrals, so just plug and chug.
April 27, 2015

Algebra
If the classes are a,b,c,d, then b = a+60 c = 2a-50 d = 3a a+b+c+d = 1424 a+(a+60)+(2a-50)+(3a) = 1424 7a + 10 = 1424 7a = 1414 a = 202
April 27, 2015

math
2-2sin^2-sin-1=0 2sin^2+sin-1 = 0 (2sin-1)(sin+1) = 0 sin = 1/2 or -1 sin = 1/2 at pi/6 and 5pi/6 sin = -1 at 3pi/2 Better check your factoring. Your angles are correct for the values you obtained, but those values had the wrong signs, and hence, the wrong sines :-)
April 27, 2015

Calculus
y = √(x^3+2) y' = 3x^2/(2√(x^3+2)) y' = (6x)(2√(x^3+2)) - (3x^2)(6x^2)/(2√(x^3+2)) ----------------------------------------- 4(x^3+2) 24x(x^3+2)-18x^4 ------------------------ 8(x^3+2)^(3/2) 3x(8(x^3+2)-6x^3) ---------------- 8(x^3+2)^(3/2) 3x(...
April 27, 2015

Precalc-functions
y = 2/3 x + 5 y-5 = 2/3 x x = 3/2 (y-5) so, f^-1(x) = 3/2 (x-5) as with all polynomials, the domain is all real numbers.
April 27, 2015

Math 222
why not just use conventional math notation? 5x^2-9x+2 = 0 the discriminant is b^2-4ac = 81-40 = 41 Now just use that in the quadratic formula. Since the discriminant is positive, there are two real solutions: x = (9±√41)/10
April 27, 2015

Math
I think it is (C) Roll that rectangle along the horizontal axis, and fold over the ends.
April 27, 2015

Math
looks correct to me.
April 27, 2015

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