Friday
May 6, 2016

Posts by Steve

Total # Posts: 40,202

PHYSICS. HELP!my work
Using the law of cosines, and the fact that adjacent angles of a parallelogram are supplementary, r^2 = 20^2 + 34^2 + 2*20*34 cos35° r^2 = 2670
April 5, 2016

Math(1 question plz help thanks!=D
C -2 and 2 have the same absolute value But 2 and 2 have the same absolute value
April 5, 2016

Algebra
If the fast plumber takes x hours, then the slow one takes x+5 hours. 1/(x+5) + 4(1/x + 1/(x+5)) = 2/5 x = 20 So, the 1st plumber takes 25 hours. Check: In 1 hour, the 1st plumber finishes 1/25 of the job. During each of the next 4 hours, the two together finish 1/25 + 1/20 = ...
April 5, 2016

Maths
If there are x behind, the queue looks like x ... me ... x+n (x+1+x+n) = 3x 2x+n+1 = 3x x = n+1
April 5, 2016

Math
(5/2)(3) = (1/2)(5)h h = 3
April 5, 2016

Math
(x-2)^2 + x^2 = (x+2)^2 2x^2-4x+4 = x^2+4x+4 x^2-8x=0 x = 0 or 8 0 is out, so the sides are 6,8,10
April 5, 2016

College Algebra
I think there's a typo. As written it is just 20 e^-t Anyway, since I have no idea when the plague began, I have no value for t. As for B, the typo does not allow for a limiting population.
April 5, 2016

Math
reflection through the y-axis changes the sign of the x-coordinate. Surely your text explains this. Or, you could get out some graph paper and do some experimenting. Just plot a point and flip it over the y-axis.
April 5, 2016

Math
how many times you gonna beat this dead horse?
April 5, 2016

Maths
if the cone were complete, it would have height 45/2, so the missing part has height 27/2. So, if there are x coins, (π*0.2*1^2)x = π/3 (5^2*45/2 - 3^2*27/2) x = 735
April 5, 2016

Maths
50 cot30° + 50 cot45°
April 5, 2016

math
surely it is 311*196=60956 or, as an estimate, 300*200 = 60,000 I guess their estimate is based on the average number of words per page. So, 60956 is close to 61,000.
April 5, 2016

Math
That is true. So, I guess your answer is ok, if you wanted it in ft^3. You neglected to mention that fact in stating the problem, or in giving units in your answer.
April 5, 2016

Math
how did 24 become 2?
April 5, 2016

math
It is in fact one of them. So, how do you use what I told you to get the whole population?
April 5, 2016

math
42/90 = 46.67% of the tagged squirrels. so, you can expect that 630 = 46.67% of the total population.
April 5, 2016

Math
looks good.
April 5, 2016

Science
Your answer makes no sense. The atom contains all three shells. Na is element #11. I think you omitted the question you are answering using the given data. (And I suspect it is shell 3)
April 4, 2016

Algebra
I'd say it's two positives & two negatives numbers on a number line in order of their absolute values from greatest to least
April 4, 2016

Math Algebra 2
something wrong with Reiny's previous solution? http://www.jiskha.com/display.cgi?id=1459772906
April 4, 2016

Geometry
google's first hit answers your question. Too bad you couldn't be bothered. https://www.algebra.com/algebra/homework/Bodies-in-space/Bodies-in-space.faq.question.975480.html
April 4, 2016

Math
any number.
April 4, 2016

Math HELP!
the law of cosines says that if x is the longest side and θ is the opposite angle, x^2 = 10^2 + 29^2 - 2*10*29 cosθ If x is less than 10^2+29^2, all three angles are acute. Of course, if x is not the longest side, then rearrange the numbers a bit to find other ...
April 4, 2016

Math
4/3 is greater than 1. So, how can 4/3 * 3.14 be less than 3.14?
April 4, 2016

algebra
you need to plug in the values and see whether they work on both lines. What do you get?
April 4, 2016

math
the line must have slope -5/6 So, using the point-slope form, that means the equation is y+5 = -5/6 (x+5) Now just rearrange that to the form you want.
April 4, 2016

Math
no. He did not live all full years. Figure the number of days in 2004 and 2008 that he lived, and then add 3*365 to that.
April 4, 2016

math 4th grade no algebra
if you are against using any algebra, just start trying numbers that add to 50. You want two which are 26 apart. 10+40=50, but they are 30 apart. Each number you add to 10 and subtract from 40 reduces the distance by 2. So, 12+38 = 50
April 4, 2016

Math
no idea. I can give you the answer, though. 3x5(5x6) = 3x5x30 = 15x30 = 450
April 4, 2016

math 2
t = ka/p So, pt/a = k is constant. So, you want a such that 6*1/a = 5*2/100
April 4, 2016

Science
looks better to me.
April 4, 2016

Science
Nope. The space station is in orbit. So, it can't be used to travel to and from.
April 4, 2016

Calculus
Without even knowing any calculus, it's easy to see that a linear approximation works best where the graph's curvature is less. Since a parabola is most curvy at its vertex, the best approximations are those farthest away. In this case, at x=4. So, since the tangent ...
April 4, 2016

math( surface area )
If the base has area B, then the prism's surface is 2B + 2*20(L+W) If L=W, then 2L^2 + 80L = 2400 L=W=20 See what you can do with L not equal W.
April 4, 2016

Math
since all the sides are magnified by a constant amount, the ratio of corresponding sides must be the same. So, 8/2 = x/4
April 4, 2016

statistics
1/6 * 1/6
April 4, 2016

Math Algebra 2
Aside from the typo where the c^2 gets lost, I'd just do it like this: m^2(1 - v^2/c^2) = m0^2 1 - (v/c)^2 = (m0/m)^2 (v/c)^2 = 1 - (m0/m)^2 v/c = √(1 - (m0/m)^2) To me, that makes it easier to see how the ratio of v to c is related to the ratio of the masses. ...
April 4, 2016

simultaneous equation help
From #1, y = (x^2-3)/(2x) so, in #2, 3x^2 - ((x^2-3)/(2x))^2 = 26 Or, assuming x≠0, (11x^4-98x^2-9)/(4x^2) = 0 (x-3)(x+3)(11x^2+1) = 0 x = -3 or 3 or complex values.
April 4, 2016

Algebra
If Diane takes x hours, 1/x + 1/(x-2) = 1/4
April 4, 2016

math- geometry
yes.
April 4, 2016

Math (Rounding #s)
It is 0.600 The 3rd decimal place is the thousandths. You need the two trailing zeros to specify the precision of the number.
April 4, 2016

Math Algebra 2
y = a(x-p)(x-q) using three different values of a will produce three different polynomials. Graphing them will produce parabolas that all cross the x-axis at the same two places (if at all), but are scaled differently.
April 3, 2016

Trig
recall that cos(a-b) = cosa cosb - sina sinb
April 3, 2016

Math
f = (2-3x)/(5-2x) f(a) = 3 when (2-3a)/(5-2a) = 3 2-3a = 15-6a 3a = 13 a = 13/3
April 3, 2016

Math
the pyramid has 1/3 the volume of the prism. Why wait for hours, when google can show you many discussions and formulas?
April 3, 2016

maths help!
know the density? mass = density * volume
April 3, 2016

Math
pyramid has 1/3 the volume of the prism.
April 3, 2016

Maths
tan^2(x/2) = (1-cosx)/(1+cosx)
April 3, 2016

Maths
sinx + sin3x = 4sinx cos^2x = 2sin2x cosx So, you have (2sin2x cosx - 2sin2x) --------------------------- (2sin2x cosx + 2sin2x) 2sin2x(cosx-1) --------------------- 2sin2x(cosx+1) = (cosx-1)/(cosx+1) Now take a look at the half-angle formula for tan(x/2)
April 3, 2016

maths
x^3-2x^2-13x-10 = (x+1)(x+2)(x-5) x^3-8^2 = (x+4)(x^2+4x+16) Looks like the LCM is just the product, since there are no common factors. Not sure what the minuscule has to do with it.
April 3, 2016

Springville Middle School
1/3 * pi * 15^2 * h = 7800
April 3, 2016

Math
h cot30 - h cot45 = 6
April 3, 2016

Algebra
{3,6,9,...}
April 3, 2016

math
clearly there were 3 times as many pears as oranges. So, 20 oranges.
April 3, 2016

maths
Is there a question somewhere in there?
April 3, 2016

MATH
if you are given only two of the dimensions, there is no way to determine the third. You need to know the volume, or the area, or a diagonal -- something to pin down that third dimension.
April 3, 2016

cs203
google is your friend. You might start here: http://stackoverflow.com/questions/14622371/how-do-i-print-a-binary-number-with-an-inputed-integer
April 2, 2016

algebra
or, since you have a point and a slope, you can just use the point-slope form: y-5 = 3(x-4)
April 2, 2016

Math
As long as the same dimension was used for rolling, the circumference is the same and the height is the same. So, the radii are the same, and both cylinders have volume π r^2 h.
April 2, 2016

math
okay. You know that all the s^(4x) and e^(-4x) stuff will zero out. So we need some quadratic stuff that will leave a particular solution. So, let's say that y_p is yp = Ax^2+Bx+C yp" = 2A yp" - 16yp = 2A - 16(Ax^2+Bx+C) So, we need -16Ax^2 - 16B + 2A-16C = 256x^...
April 2, 2016

Mathematics
(1-4)/(2-1) = -3/1 = -3 Clearly you need to plot the points and take a look at the line. + slopes are rising to the right - slopes are falling to the right
April 2, 2016

Math
clearly, 1275/1700 = ?
April 2, 2016

Mathematics
(1-3)/(-2-2) = -2/-4 = 1/2 Gotta watch those plus/minus values.
April 2, 2016

math
It's bad form to describe N(p) and then talk about x and y. Clearly, the N intercept is at -2818. What is p when N=0? Care to reconsider your answer?
April 2, 2016

math
Actually, it's the w-intercept in this case. At any rate, at the intercept, m(w)=0. That is, no money remains.
April 2, 2016

algebra
3/4 of 60 is 45 mi 45mi/9hr = 5 mi/hr what was she driving, a roller skate?
April 2, 2016

Geometry
h = 7√3, so each side is 14 A = (1/2)(14)(7√3) = 49√3 P = 3*14 = 42
April 2, 2016

maths
since (a+b)(a-b) = a^2-b^2 √3-√2 * (√3+√2)/(√3+√2) = (3-2)/(√3+√2) I assume by ig you mean log log(√3-√2) = -log(√3+√2)
April 2, 2016

Calculus
(x-3)^(2n)/4^n = (x-3)^(2n)/2^(2n) = ((x-3)/2)^(2n) So, as long as |(x-3)/2| < 1 it will converge.
April 2, 2016

math
Note that log_2(n) = 2*log_4(n) = 3*log_8(n) a = log_4(y) = (1/2) log_2(y) b = log_8(2y) = log_8(2) + log_8(y) = 1/3 + (1/3) log_2(y) b = 1/3 + (2/3) a 3b = 1+2a If logn = logm + 1, logn = logm + log10 = log(10m) so, n = 10m
April 2, 2016

math
20*8-20*5 = 20(8-5) = 60
April 2, 2016

math
8x + 5x = 260 find x, and then the amounts are 8x and 5x. Subtract to get your answer.
April 2, 2016

Geometry
Each leg is 10/√2, so P = 2*10/√2 + 10 = 10(1+√2) A = (1/2)(10/√2)(10/√2) = 100/4 = 25
April 2, 2016

Math
exactly.
April 2, 2016

Math
remember that distance = speed * time so, plug in your numbers.
April 2, 2016

Math
just multiply everything by 3!
April 2, 2016

Math
consider the sales tax. If it is 5%, the the final price is the retail price times 1.05, right? So, if our tax rate is r (expressed as a decimal), then the final cost of 70.75 is (1+r) times the sticker price. The tax amount is the final cost minus the sticker price: 70.75 - ...
April 2, 2016

Math
70.75(1-1/(1+r)) = 5.66 r = 0.0869 = 8.69%
April 2, 2016

maths-help!!
well, 240 = 4*60 so 2n can be any value from 0 to 58 so, n ...
April 2, 2016

math
(n*1.60)/(d*0.80) = (n/d)(1.60/.80) = (n/d)(2) so, the fraction is doubled. What percent increase is that? And it is not 200%!
April 2, 2016

math
(a*1.50)(b*0.80) = (ab)(1.20) so, the product increased by 20%
April 2, 2016

math
I can't quite picture your diagram, but 40 is 5/9 of the whole area. Maybe you can use that to get what you're after.
April 2, 2016

math
If each light consumes h watt-hours, then 4 lights running for n hours consume a total t of t = 4h*n Plug in your numbers. I can't figure out just what you're after.
April 2, 2016

math - eh?
Can you see how woefully incomplete your information is, if you want a solution?
April 2, 2016

Math - incomplete
why is x zero twice? Given your "table," I can fill in any numbers I want.
April 2, 2016

maths
S+H+J = 500 J = 3S S+33 = (5/6)(J-33) Oddly, I don't get integer solutions. Better check the problem and my setup.
April 2, 2016

Computer science
sure. That's why some computer folks are called systems analysts. Their basic software is called an operating system.
April 2, 2016

Mathematics
nope. (1-5)/(3-6) = -4/-3 = 4/3 better review the definition of slope.
April 2, 2016

Mathematics
did you plot the points? both have -3 for the x-coordinate, so the line is vertical. did you do the actual calculation? change in y divided by change in x? (-6 - -5)/(-3 - -3) = -1/0 is undefined.
April 2, 2016

Math(PLZ HELP)
#1 kg?? Really? That's over 2 lbs! Your paper clips must be a lot bigger than mine. #2 see #1 #3 ok #4 ok #5 ok #6 ok #7 a 15 ft border is added to each side, making both width and length 30 ft more. So, the new dimensions are 26+30 by 21+30 = 56 by 51
April 1, 2016

Math
Make a Venn diagram, and you can easily see that there are 70 students taking at least one of the classes, and thus 37 taking no class. Using the diagram, you can easily see how many students fit the questions; and thus the probabilities needed.
April 1, 2016

Math (Real Analysis)
epsilon-delta proofs use limits. abs(f) is continuous if f is continuous, because |f| = f if f>=0 |f| = -f is f<0 So, if the limit L exsists for f(x), it also exists for |f(x)|.
April 1, 2016

math
1 lb = 16 oz 3 lb = 48 oz You have given the number of lbs in 3 oz.
April 1, 2016

trigonomentry
no diagram, but I suspect that the Pythagorean Theorem can be used here.
April 1, 2016

math
no idea. There must be some other information here. If you know the height and the width, the length can be anything unless you also know the volume or area or a diagonal.
April 1, 2016

math
correct.
April 1, 2016

math
miles = 6 * minutes
April 1, 2016

Dosage calculations
1 tsp * 4.93 mL/tsp = 4.93 mL All that other stuff about number of days and number of doses is just noise.
April 1, 2016

umd
ok. Now what?
April 1, 2016

Algebra 2
font problems. Is that supposed to be sigma = 3.1? If so, just figure the mean, and find the maximum difference of each grade from the mean. Then divide that by 3.1 to get the number of std.
April 1, 2016

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