Monday
July 25, 2016

Posts by STEVE

Total # Posts: 42,055

physics
surely you have a formula which gives this value. If not, see the excellent article in wikipedia on "trajectory"
June 5, 2016

Math
MP*.84 = CP*1.05 MP/CP = 1.05/0.84 = 1.25 so, the original markup was 25%
June 5, 2016

MATH
Draw a diagram. It is clear that the distance of chord from center: d^2 + (6/2)^2 = 5^2 the chords are 2d apart.
June 5, 2016

maths
18*2 + x = 27*3
June 5, 2016

itc c++
what, you don't have a c++ system?
June 5, 2016

math
The beam length b is b^2 = 192^2 + (70+10)^2
June 5, 2016

Math - surface area
well, the area is πr^2 = 4π yd^2 a first approximation is thus 4π*13
June 5, 2016

maths
24^2 + 48^2 + h^2 = 56^2
June 5, 2016

math
3b+c = 14t b+6t = 1c so, find c in terms of t: c = 14t-3b = 14t-3(c-6t) c = 14t-3c+18t 4c = 32t c = 8t
June 5, 2016

math
If the 4 groups have w,x,y,z respectively, then w = x+4 x = y-1 z = 2x w+x+y+z = 20 Now just crank it out.
June 5, 2016

Math(Please Help Assignment Due Today)
man. of all the possible sets, AAA does not guarantee congruence -- only similarity.
June 4, 2016

Math(Please Help Assignment Due Today)
well, you've posted this a few times. Did you think of googling your question? Many hits. Maybe you could start here: http://www.regentsprep.org/regents/math/geometry/gp4/ltriangles.htm
June 4, 2016

math
not quite. You figured the straight-line distance, but that does not answer the question. Read it again carefully.
June 4, 2016

physics
The ratio of KE after the bounce to before the bounce is 1/2 m(.8v)^2 -----------------      1/2 mv^2 = .8^2 = .64 so, the ball will bounce .64 as high as the original height
June 4, 2016

geometry
so, add 5 to x and subtract 4 from y. Not so hard, eh?
June 4, 2016

maths
f(x) = 2x Looks like y= ax, with a=2 or y = 2f(x) if f(x) = x not quite sure just what it is you're asking. enter your expression at wolframalpha.com and see the graph.
June 4, 2016

science
the difference is .11 hours .11/3.15 = 0.0349 ≈ 3.5%
June 4, 2016

mathematics
As always, draw a diagram. AB/18 = tan35° CD^2 = 18^2 + 24^2 from C, tanθ = AB/24 from D to C, tanθ=24/18, so the bearing is 360-θ
June 4, 2016

mathematics
well, the common denominator is 2(y-1), so that gives you 1(y-1)+3(2) -----------------     2(y-1) ...
June 4, 2016

Math
but, you know how to count money, right? 7 quarters = $1.75 need 11 more coins, so start using smaller ones. 6 quarters and 5 nickels = $1.75 need 7 more coins 5 quarters and 10 nickels = $1.75 need 2 more coins. 4 quarters and 15 nickels - $1.75 need 2 coins less 4 quarters, ...
June 4, 2016

Math-Calc
so, the critical numbers are the values where f'(r) = 0, right? A fraction is zero if its numerator is zero. So, what is r if 7 - 10r^2 = 0?
June 4, 2016

Statistics
Never mind -- I'm bored already.
June 4, 2016

maths again plz
since 1 hour is 60 minutes, 35'25" = 0.59 of a complete circle. the circumference is 2pi*r, so the distance traveled is 2pi*8.8*0.59 = 32.64 cm
June 3, 2016

maths-need help asap
yes, with no radius, it's difficult to find the volume. The problem has been garbled, apparently. Both the cylinder and the cone are incompletely specified. And that doesn't even get into the bad grammar...
June 3, 2016

maths-need help asap
just find the volume in cm^3 Then recall that 1L = 1000cm^3
June 3, 2016

math
(5/3)^2 * (3/4)^2 = (5/4)^2 = 1.5625
June 3, 2016

Math
well, let's see... cos(x) starts at the top, and has amplitude 1. You want to start at the bottom, with amplitude 30. cos(kx) has period 2π/k. You want period 2. So, what is k?
June 3, 2016

algebra
xy=20
June 3, 2016

Maths
just compute the lengths of the sides. Two of them are equal.
June 3, 2016

Calculus
nope, you need k * f(x) and C alone. ∫k*f(x)+C dx = ∫k*f(x) dx + ∫C dx = k∫f(x) dx + ∫C dx your answer is ∫k(f(x)+C) dx
June 3, 2016

Math (Parametrics)
x=cos(t) y=sin(t) This will start at (1,0), but you want to start at (0,1) Since cos(0) = 1, you need y = cos(t) x = sin(t) Now you can see that as t->pi/2, y goes down and x goes to the right. That makes it clockwise.
June 3, 2016

college Algebra
so close! But 2+6≠9 The roots are irrational.
June 3, 2016

Calculus
Recall that if F(x) = ∫[a,x] f(t) dt, F'(x) = f(x) so, F'(x) = f(x) = cos(x^3)
June 3, 2016

Math Urgent Please Help
RST has sides RS=4, RT=3, ST=5 If the other triangles are ABC, then we have (a) AB=4, AC=√20, BC=√20 As you can see, the various sides are not all the same multiple of RST's sides. You will need to check the others to see whether their sides are in the ratio 4:...
June 3, 2016

math
42p = 4-2p+8 44p = 12 ...
June 3, 2016

science
the resultant has magnitude √(23^2 + 41^2) and direction θ where tanθ = 23/41
June 3, 2016

Discriminant
(x-y)(x+y) = x^2-y^2 you have x = b y = √40 = 2√10 so, b^2-40 = (b+√40)(b-√40) = (b+2√10)(b-2√10)
June 3, 2016

Alpha, beta
no; fractions are perfectly acceptable. Most folks like to get rid of them, though, so the second form makes them more comfortable. You could just as well have used any of x^2/7 - 2x/7 + 11/63 = 0 5x^2 - 10x + 55/9 = 0 90x^2 - 180x + 110 = 0
June 3, 2016

Chemistry
how many on a single atom? Then multiply that by .002 * 6.023x10^23
June 3, 2016

Algebra 1
2x+4 <= 14 2x <= 10 x <= 5 so, 5 is the largest possible number. 2*5+4 = 14. Any number larger than 5 makes the expression more than 14.
June 3, 2016

Math-Calc
see earlier post
June 2, 2016

Calc-Math
If you don't even know where to begin, you must not have read the section on this topic. It says that the limit of f(x)/g(x) = f'(x)/g'(x) so, your limit is just (ln3 * 3^x - ln6 * 6^x)/1 = (ln3-ln6) = ln(3/6) = -ln2
June 2, 2016

calculus
without calculus, the distance from the point to the line is |4(-2)+2(-1)+5|/√(4^2+2^2) = √5/2 Using calculus, we have the distance z from (-2,-1) to (x,y) is z^2 = (x+2)^2 + (y+1)^2 But y = -(4x+5)/2, so z^2 = (x+2)^2 + ((-(4x+5)/2)+1)^2 z^2 = 5x^2 + 10x + 25/4 z...
June 2, 2016

Geometry
The x=15 is ok Not sure what the last set of values is for, but if they are for the 1st problem, no good. x^2 + (5-x)^2 = 25 x^2 + x^2-10x+25 = 25 2x^2-10x = 0 2x(x-5) = 0 x = 0 or x=5 So, the points of intersection are (0,5) and (5,0)
June 2, 2016

Geometry
well, y = 5-x, so x^2 + (5-x)^2 = 25 now just expand and solve the quadratic.
June 2, 2016

Algebra
x^3-5x^2+2x+8 ----------------- = x^2-3x-4      x-2
June 2, 2016

Geometry
right
June 2, 2016

Geometry
Assuming a typo, and you meant PN, we have PM/ZX = PN/ZY so, (x+5)/30 = (4x-10)/75 Now just solve for x.
June 2, 2016

Calculus
I just noticed that you did not specify that the y-axis formed part of the boundary. Without that condition, the horizontal strips extend leftward forever. Of course, you may have mixed up x and y in places, so ...
June 2, 2016

Calculus
This is most easily done by integrating on y, using horizontal strips. a = ∫[-1,3] x dy = ∫[-1,3] (8+2y-y^2) dy
June 2, 2016

Math(Assignment due today)
sounds like the ramp rises at a 4.7° angle, so it's ok.
June 2, 2016

Pre-Calculus
enter your coefficients at the url below to see all the details: http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
June 2, 2016

Polynomials and properties of exponenets
I get AC?BD
June 2, 2016

Mathematics
if the quiz is counted more than the other grades, things get more complicated. If the quiz counts as much as all the rest, then the final grade would be (88+95)/2 = 91.5 I suspect there is missing information here.
June 2, 2016

Physics
they both travel with the same speed. So, a longer wavelength means it oscillates more slowly. Recall that v = λf 3λ means f/3 to get the same v.
June 2, 2016

Pre-Calculus
next time, show your work, so we can find your error. From equation 1, x = 2y-5 plug that into #2, and you have x^2+y^2 = 25 (2y-5)^2 + y^2 = 25 5y^2 - 20y + 25 = 25 5y(y-4) = 0 y = 0 or 4 now you can find x values as needed, from either equation. http://www.wolframalpha.com/...
June 2, 2016

Polynomials and properties of exponenets
D,A,C,D Looks like some serious review is in order.
June 2, 2016

Geometry
Time to review the special angles: sin(30°) = 1/2 so, √sin(30°) = 1/√2 also, cos(30°) = √3/2
June 2, 2016

algebra
Reiny responded to this earlier, at http://www.jiskha.com/display.cgi?id=1464879381 If you want to pin it down more, there must be some other constraints.
June 2, 2016

Pre-Calculus
you got c correct, but did not express the coordinates of the foci. c = ±5 where is the center of the ellipse? Is the major axis horizontal or vertical?
June 2, 2016

Math
correct
June 2, 2016

Pre-Calculus
you are correct as far as you went, but recall that n*ln(x) = ln(x^n). 2lnx - 6lny + 1/3ln e^12 = ln(x^2) - ln(y^6) + (1/3)(12) = ln(x^2/y^6) + 4 = ln(e^4 x^2/y^6)
June 2, 2016

5th Grade Math - Urgent Part II
1,000,000 is the only number with prime factorization 2^6 * 5^6 = (2*5)^6 = 10^6 64 is 2^6 but has no factors of 5.
June 2, 2016

Pre-Calculus
your function is just a polynomial. The domain of all polynomials is (-∞,∞)
June 2, 2016

algebra
since distance = speed * time, 6x + 6(x-20) = 624
June 2, 2016

MATH
They gave you the functions. Did you graph them as suggested? Here are the lines: http://www.wolframalpha.com/input/?i=plot+y%3D25%2B10x+,+y+%3D+18%2B15x Now you can surely answer the questions.
June 2, 2016

Trigonometery
no one is assigned to sit here and watch for problems. We have lives, too, and when we get a chance, we check in. As you know, the function a sin(kx) has amplitude a and period 2pi/k, so you can use your requirements to produce the function -4sin(8x) But you probably figured ...
June 2, 2016

match
apparently you have knowledge about ditches and absorption rates which you have not shared here.
June 2, 2016

Calculus
So, each square has base and height e^-x Thus, the volume, adding up all those thin squares, is ∫[0,2] (e^-x)^2 dx = ∫[0,2] e^(-2x) dx let u = 2x, and that becomes (1/2)∫[0,4] e^-u du ...
June 2, 2016

Physics
wrong
June 2, 2016

math
(1+r)^12 = 2 r = 2^(1/12)-1
June 2, 2016

Math
I assume you really meant 1/(x-1)+1/(x+1) ------------------ 1/(x-1)-1/(x+1) cross-multiply to put top and bottom over a common denominator of (x-1)(x+1) Then since the same denominator occurs top and bottom, it can be discarded, just as (2/3)/(5/3) = 2/5 now you have (x+1)+(x...
June 2, 2016

Math
gibberish
June 2, 2016

Maths
kx^2-5x+k is not a cubic polynomial.
June 2, 2016

physics
Since F=ma, the acceleration of the car is 1/5 gravity. So, how long does it take the car to move 20cm, under (1/5)g acceleration? s = 1/2 at^2
June 2, 2016

Math Please Help Quick
.20 * 20 = ?
June 2, 2016

math
t+r = 800 (3/4)t + (5/6)r = 800-192 to find r, substitute for t: (3/4)(800-r) + (5/6)r = 608 (1/12)r + 600 = 608 r/12 = 8 r = 96
June 2, 2016

math
if you google manual cube roots, you will find several nice explanations of how to extract roots by hand. It's not worth the effort, since calculators are so handy these days. Use your calculator to evaluate 36.13^(1/3) power
June 2, 2016

maths
draw a diagram. review your basic trig functions. Now it is clear that 2.5/x = cos60° now just solve for x, the length of the ladder.
June 2, 2016

Math Year 10 - Simultaneous equations
c = 2s 2c+4s=104 now solve for c
June 2, 2016

Mathematics
It'd be nice to have some of your work to look at, eh? 3/x + 5/y = 4 9/x + 4/y = 5 It gets messy to try and solve for x or y, so solve for 1/x instead. 1/y = (4-3/x)/5 thus, 9/x + 4/5 (4-3/x) = 5 45/x + 16 - 12/x = 25 33/x = 9 1/x = 9/33 = 3/11 so, x = 11/3 now plug in to ...
June 2, 2016

Figurs and Numbers
12% = 0.12 spending means that amount is subtracted. So, subtract .12 twice. Having done that, subtract another 25% = 0.25, and the remainder is 2010. Then find x, the original amount which leaves that remaining amount. Finally, knowing x, 25% of 57% of that amount is what was...
June 2, 2016

Figurs and Numbers
x(1-.12-.12)(1-.25) = 2010 .76*.75x = 2010 x = 3526.32 x * .76 * .25 = $670.00 on education
June 2, 2016

Pre-Calculus
well, it could be (x+1)(x-7)(x^2-2) = what you wrote. extra credit: are there any others?
June 2, 2016

Geometry
I agree. It looks like a syllogism, but there are too many things wrong.
June 2, 2016

Sxiences
recall that F = ma now just plug in your numbers to get m.
June 1, 2016

Spanish
correct
June 1, 2016

MAth
simple interest: 200*.06*2
June 1, 2016

Chemistry
depreciation
June 1, 2016

Chemistry
two errors, DrRebel: (0.693/3.8) ≠ 0.8663 it was 98.4, not 94.4
June 1, 2016

Chemistry
98.4 * (1/2)^(19/3.8) = 3.075 g
June 1, 2016

Mathematics
for the perimeter, since p = 2(length+width) p is even, since it is a multiple of 2.
June 1, 2016

Algebra
How much more is 9 than 7? You do it by finding the difference: 9-7 so, do this the same way: (9x+8)-(5x+6) ...
June 1, 2016

math
divide that by 2, since it takes two hands to shake once.
June 1, 2016

Math
x:9=2/3:36 x*36 = 9 * 2/3 36x = 6 x = 1/6 = 0.1666 or, x/9 = (2/3)/36 x/9 = 2/108 x/9 = 1/54 x = 9/54 = 1/6 maybe you should try some other proportions with less complicated numbers, to learn the method and why it works.
June 1, 2016

Math
you have to subtract the width of the frame, both top and bottom. The remaining height is occupied by the picture 5 2/3 * 2 = 10 4/3 = 11 1/3 now subtract that from the overall height, and you have 25 5/6 - 11 1/3 = 25 5/6 - 11 2/6 = 25-11 + 5/6 - 2/6 = 14 3/6 = 14 1/2
June 1, 2016

Science - Chemistry
Kind of depends on the size of the diamond, wouldn't you say?
June 1, 2016

Math please help
note that as x grows by 2, y falls by 1. That gives you a slope of -1/2. So, start with y = -1/2 x But, if you plug in x=2, that gives y = -1/2 (2) = -1 But in fact, y=1. So you need to add 2, giving you y = -1/2 x + 2 or, y = (4-x)/2 Use the other values of x and y to see ...
June 1, 2016

Pre-Cal: Plz help!
Go to Reiny's url and tweak the input until it agrees with what you intended. It's probably just a combination of typos.
June 1, 2016

math
me either, but recall that 1L = 1000cm^3, so find your volume in cm^3 and divide by 1000
June 1, 2016

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