Saturday
October 1, 2016

Posts by Steve

Total # Posts: 44,316

Physics
t is 2.5 Vi is 15 m/s up a = -9.8 m/s^2 up (or, 9.8 m/s^2 down) d = Vi * t + a/2 t^2 = 15*2.5 - 4.9 * 2.5^2 = 6.875 m Vf is Vi + at = 15 - 9.8 t^2 (though it does not matter for this question)
September 22, 2016

Math
x = 2 A = {2}
September 22, 2016

Math - eh?
{x: x 3x=6} ?? Do you mean {x: 3x=6} ?? Then you ask Does A? Does A what? However, you are correct in saying that {2} is not 2
September 22, 2016

Computer science
https://en.wikipedia.org/wiki/Virtual_memory
September 22, 2016

math
(72+84+90)/6 + 90/2 = 86
September 22, 2016

math
also check out the way the coefficients are sums of subsets of the roots: http://mathforum.org/library/drmath/view/61024.html
September 22, 2016

Mathematics
list a few how far apart is each from its neighbor?
September 22, 2016

math
think of the factors of 18 which two differ by 3?
September 22, 2016

Algebra
x = x/3 + 8 + 52
September 22, 2016

Math
(1 hr 54 sec) * 7 And yet, I suspect you meant 1 hr 54 min.
September 22, 2016

Algebra
900/(300+250) hours later
September 22, 2016

Math
6:8:15 * 7/5 = 42/5 : 56/5 : 21
September 22, 2016

calculus
x^2+y^2 = 10^2 so, when x=6, y=8 2x dx/dt + 2y dy/dt = 0 Now just plug in your values to find dx/dt
September 22, 2016

math
14250 * 1.02^3
September 22, 2016

United States History
thank you
September 22, 2016

United States History
How is this map different from a typical map of the United States? I couldn't get the map to paste here but it is of the Eastern United States with all the states names crossed out and Irish names put in. circa 1900's I think it was during the potato famine when Irish ...
September 22, 2016

Math
2P = 3*1000
September 22, 2016

Math
Since x:y = 7:9, y = 9x/7 (9/7)x = x+10
September 22, 2016

Algebra
d+t = 48 t+8 = 3(d+8) Now just solve for d and t.
September 22, 2016

Math
well, does it?
September 22, 2016

Math
well does it?
September 22, 2016

Geometry
just take each point and see whether the rule transforms it to the desired point. For example, (x,y+1) transforms (2,4) -> (2,5) Then see which rule takes all 3 points where you want them.
September 22, 2016

Math
Use the first pair to get the ratio 60/3 = 20 So, for each pair, the 2nd value should be 20 times the 1st value.
September 21, 2016

AP physics
their combined speed is 1560 km/hr time = distance/speed, so ...
September 21, 2016

Math
You asked: Determine the number of seats in a bus for each value of r. yet you did not provide any values of r. So, I picked one: 0 Now you pick some others and evaluate 5 + 4xr for each one. I like to help with answers, but don't make me come up with the questions, too.
September 21, 2016

Math
0: 5 ...
September 21, 2016

algebra
so far so good: 17/4x = 23/(x+6) now cross-multiply (shorthand for saying multiply by the LCD): 17(x+6) = 23(4x) 17x + 102 = 92x 102 = 75x x = 102/75 = 34/25
September 21, 2016

Math algebra
hint: think "difference of two squares"
September 21, 2016

MATH HELP
1C w/o the typo no ideas on the others?
September 21, 2016

Math
just write their areas as a ratio 24:15 or 8:5
September 21, 2016

algebra
all ok
September 21, 2016

Math (Geometry)
statement: if A then B converse: if B then A
September 21, 2016

Math
a/(1-r) = 100 ar = 24 divide and you have 1/(r(1-r)) = 100/24 r = 2/5 or 3/5 a = 60 or 40
September 21, 2016

Math
first step: list the possible combinations of coins: 4q, 0d, 1n ... 0q, 0d, 21n Then note how many cannot change $1.00
September 21, 2016

Physics
a = -45m/s / 9s = -5m/s^2 s = 45t - 5/2 t^2
September 21, 2016

Math
time to review your basic trig functions. The height h is found by h/100 = tan50°
September 21, 2016

MATHEMATICS
after t hours, the fraction left is (1/2)^(t/9) So, after 3 hours, there is (1/2)^(3/9) = .7937 of the original amount left.
September 21, 2016

Math
time = distance/speed, so (400/(150/20)-400/(100/12.5))(100/12.5) = 26.66m
September 21, 2016

Math
(400/(150/20)-400/(100/12.5))(100/12.5) = 26.66m
September 21, 2016

MATH
after t hours, the amount left is 2 * (1/2)^(t/5)
September 21, 2016

jay
nope. And where are your divide symbols? P/2 = l+w now go from there.
September 21, 2016

Calculus
I assume you want k and m so that g(x) is continuous? Just to make things easier, recall that e^(ln u) = u so, e^(ln(2x+3)) = 2x+3 If so, then you want the endpoints to match: (k(-2)^2)+m = 2(-2)+3 k(3)-m = 2(3)+3 or, 4k+m = -1 3k-m = 9 I guess you can handle that, yeah? As ...
September 21, 2016

math
20-4-4-4-4-4 = 0
September 21, 2016

Physics
8.0 m/s^2 * 1km/1000m * (3600s/hr)^2 = 103680 km/hr^2 after h hours, the distances must be the same: 91.0h = 52.0h + 51840h^2 h = 0.000752315 hours = 2.7 seconds Or, you may want to convert km/hr to m/s, but the answer is the same. To get the distance, just plug it into either...
September 21, 2016

math
well, 2.5 = root(6.25) now just order the squares.
September 21, 2016

Math
2m^2+m-2m = 2m^2-m = m(2m-1) I suspect a typo, as this does not fit well with the grouping techniques.
September 21, 2016

Math
I get 4502 counted using bash: for i in `seq 1 11521` ; do echo $i ; done | tr -c -d '3' | wc -c
September 21, 2016

biomechanics
how long does it take for v to drop to zero? v(t) = 14.27 - 1.67t using that t, the distance moved is s(t) = 14.27t - 0.835t^2
September 21, 2016

Physics
or, more directly, recalling that the range is R = v^2/g sin2θ just solve for v in v^2/9.8 * sin62° = 8.3
September 21, 2016

Math
you manage to use + and x, but can't manage / ? 18+9x(5+4)/3-5 18+9x9/3-5 18+81/3-5 18+27-5 ... or 18+9x(5+4)/3-5 18+9x(9/3)-5 18+9x3-5 18+27-5 ...
September 21, 2016

trigonomentry
not sure what you mean by a "series" of cos, but if you recall your binomial expansions, (a+b)^4 = a^4+4a^3b+a^2b^2+4ab^3+b^4 and then let a=1 and b=cos^2(x), you have sin^8(x) = (sin^2(x))^4 = (1-cos^2(x))^4 = 1 - 4cos^2(x) + 6cos^4(x) - 4cos^6(x) + cos^8(x)
September 21, 2016

Algebra
well, to get rid of all those words, and use some math, 2u^4*v^2 / 3u = 2u^3v^2/3 or, 2/3 u^3v^2
September 21, 2016

Math
or, you can think of it like this 27 = 9*3, so 7:9 = 7*3 : 9*3 = 21:27
September 21, 2016

physics
You need to use the velocity, since distance = speed * time The speed is -15 m/s, so after t seconds, starting from x=30, x = 30 - 15t So, you are correct that x(1) = 15, but after 2 seconds, x(2) = 30 - 15*2 = 0 The object has indeed moved 30m after 2 seconds, but it has ...
September 21, 2016

Geometry H
E does not matter for this question. Since D bisects the angle, m<CBD = 1/2 m<CBA = 36
September 21, 2016

physics
you can make this hard (or more general) by setting up distance/speed calculations, and all that, but just notice that the river's speed is 1/2 that of the boat. So, the boat goes downstream 1/2 as far as it goes across.
September 21, 2016

Math :)
since 120° is 1/3 of a circle, the other two values must add up to 2/3, or twice the 120° value: x+8 = 2(x+2)
September 21, 2016

java programming
you better learn to read your java documentation. Here's a discussion of the topic: http://stackoverflow.com/questions/17538182/getting-keyboard-input
September 21, 2016

Maths
you can do it that way, but how has that helped? How do you solve x^2 = 3-2x ?
September 21, 2016

GOVT JUNIOR COLEGE
or, in the spirit of one "l", when your parot has gone.
September 21, 2016

math
google "polygon" and you will find many discussions. Or, check your course text. Or, just look in a dictionary!
September 21, 2016

Math - check answer
Looks good to me. But lots of time science folks like to use natural logs and base-e exponentials. So, since log 1.264911064 = .23500 1.264911064 = e^.23500 So, your function becomes f(t) = 58000 e^.235t
September 21, 2016

physical sciences
In one second he moves 15m, leaving 35m for braking. The speed decreases from 15m/s to 0 in 3 seconds, meaning the acceleration a = -15/3 = -5 m/s^2 Now, the distance traveled will be s(t) = 15t - 5/2 t^2 So, is s(3) less than 35m?
September 21, 2016

Math
10b + 3g + .5y = 100 b+g+y = 100 There's no unique solution, but you can see that g = 20 - 19b/5 y = 80 + 14b/5 So, it is clear that b must be a multiple of 5. Now, if b=5, g = 20-19b/5 = 20-19 = 1 So, 5 blue, 1 green and 94 yellows works out fine. You can't have more ...
September 21, 2016

Maths
x + 2(2x-4) = 57
September 21, 2016

Math
oh, you can complicate it up a bit by using a proportion: x/3 = 4/1 but this one is in fact pretty simple.
September 21, 2016

Math
if the ratio is 4, then the similar figure has lengths 4 times as big as the original. 4*3 = 12
September 21, 2016

8th grade math-exponents
it's a lot easier without all those words: (x/2)^3 * (x/2)^4 ---------------------- ((x/2)^3)^2 = (x/2)^7 / (x/2)^6 = x/2 Hmmm. Not what you want. I suspect a typo somewhere.
September 21, 2016

Math
aha! That means that while sinx=4 is a "solution" to the polynomial, it is not a real solution. It is extraneous, due to the properties of sin(x)
September 21, 2016

Math
quadratics always work. Maybe it just doesn't factor easily. Nope. works just fine: (3sinx+1)(sinx-4) = 0 Now just evaluate sinx so you get solutions for x.
September 21, 2016

Differential equations
you can start by noting that if u = ln(5x/(x+3)) du/dx = 3/(x^2+3x) The rest should be not so hard now.
September 21, 2016

Math
can you say run-on sentence? Slow down and say what you want - that breathless jumble is giving me a headache!
September 21, 2016

math
First step: come up with a function you want to minimize. Can you describe the cost in terms of the quantities?
September 21, 2016

Math
Hmmm. Better go with Reiny. I thought my answer was a bit odd.
September 21, 2016

Math
15/2 √279
September 21, 2016

Math
If the change in longitude is θ radians, the WE distance is 6400θ km. Since time = distance/speed, then (assuming a constant speed), (6400θ + 4500)/950 = 11 θ = 0.9297 = 53.3° So, now you know how far East Q is from P. As for QR, 4500 = 6400θ so, ...
September 21, 2016

Algebra 1
It is used for exponents, but some rather strange people use it to mean ^2 or squared. Going on that assumption, we have 3[42-2 (10^2-9^2)] 3[42-2(100-81)] 3[42-2*19] ... If I got that wrong, TJ, fix it and carry on.
September 21, 2016

College Algebra
1/x + 1/(20-x) = 4/15
September 20, 2016

Math
use the usual distance formula: √(((a-3b)-(a+4b))^2 + (a-(a-b))^2) = √(-7b)^2+(b)^2) = √(50b^2) = 5b√2
September 20, 2016

PreCalculus
sorry about the time. I had to guess at the unasked question.
September 20, 2016

PreCalculus
it is 10:24 a.m.
September 20, 2016

Math
looks good to me
September 20, 2016

Math
well, how many ounces in 6 lbs? Divide that by 5oz/apple to get the no. of apples.
September 20, 2016

math
no
September 20, 2016

6th Grade Maths
45/(2 x 4.7 - 4.4) x 6 = 54
September 20, 2016

Advanced Functions 12
not sure what the secant lines mean. At x = 1/2, they all pass through 1/2 f(x) = (3 - 1/4)/2 = (1/2,11/8) That won't get anywhere near the tangent line, no matter what other point you choose. I suspect there is something left unsaid here.
September 20, 2016

math
42
September 20, 2016

Math
well, the list of running times is 5,7,8 can you not figure the range of such a list?
September 20, 2016

calculus need help
Really. Ha you know that the solution of y" + y = 0 is y = a sinx + b cosx Now use the method of variation of parameters: We now have y1 = sinx y2 = cosx The Wronskian of {sinx,cosx} is -1 u1 = ∫cosx tanx dx = ∫sinx = -cosx u2 = -∫sinx tanx dx = ∫...
September 20, 2016

math
cannot access files stored on your computer. duh.
September 20, 2016

Math
(1/3 ft)/ (1/6 yd) but, since 1 yd = 3 ft, you have = (1/3 ft) / (1/2 ft) = (1/3) / (1/2) = 2/3
September 20, 2016

maths
You have three unknowns, and only two equations. Here is what wolframalpha.com says: c+s+h = 100 5c + s/10 + 2h = 100 http://www.wolframalpha.com/input/?i=solve+c%2Bs%2Bh+%3D+100,+5c+%2B+s%2F10+%2B+2h+%3D+100 There is no unique solution, but if you play around, you can see ...
September 20, 2016

algebra
correct
September 20, 2016

algebra
what do you mean by "write a full" ? Note that as x grows by 1, y grows by 2. SO, start wity y = 2x Now adjust that so that the values agree with those in the table.
September 20, 2016

Math
5.25/.75 = ?
September 20, 2016

Math
Why have two variables? Each function has a flat fee and an hourly rate. The only variable is the time. You want the time to be such that the two cost are equal. Where did you get the 2? You're not multiplying by the number of service calls. Each service call has a flat ...
September 20, 2016

Math
well, st = u + v/2 now just one more step to go...
September 20, 2016

math
again? See your first post, or the related questions below
September 20, 2016

Math
if moving in the same direction as the bus, just add the speeds. If moving in the opposite direction, subtract her walking speed from the bus's speed.
September 20, 2016

Math
No. It grows 144/7 = 20.57 inches. Think about it. It takes 7 days to grow 6 inches. 24 is a little more than 3*7. So, it will grow a little more than 3*6 = 18 inches. You need to work on your reading, too...
September 20, 2016

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