Wednesday
September 28, 2016

Posts by STEVE

Total # Posts: 44,179

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

Math
If it were 21 days, since 21 = 7*3, it would grow 6*3 = 18 inches. 24 is not quite that simple. It grows (24/7) * 6 = 144/7 inches why did you multiply 6 by 4? You cannot multiply days by inches. The units make no sense. Instead, you want to convert days to inches, using the ...
September 20, 2016

math
see earlier post
September 20, 2016

Math
draw the vectors. Since they are perpendicular, the resultant is just the hypotenuse of the triangle.
September 20, 2016

Jewelry
Seems like I read about this necklace in a mystery novel...
September 20, 2016

math
solve as you would an equation. The only thing to watch for is to change the direction of the inequality when multiplying by a negative quantity. 2(3x−6)>=5x-10 6x - 12 >= 5x-10 6x-5x >= -10+12 x >= 2 So, pick out all the values at least 2. To be sure, ...
September 20, 2016

math
you ask us to show our work in solving the problem. Why not show your work and how it went wrong? I suspect a typo, since 5(0) - 10 = -5 That makes your equation 2(3x-6) = -5 So, does -5 work? 2(3(-5)-6) = 2(-15-6) = 2(-21) = -42 Nope. Now you try the others to see whether any...
September 20, 2016

Math
fifty seven million three hundred seventy-three thousand two hundred eighty-four = 57373284 Now just move the decimal place as needed.
September 20, 2016

Algerbra
well, 1.7x10^2 = 0.17x10^3 Now just add 'em up
September 20, 2016

Math
review the conditions for the series to exist. In this case, it will exist for x=0, so we want y = ∑anx^n y' = ∑nanx^(n-1) y" = ∑n(n-1)anx^(n-2) The DE then says ∑n(n-1)anx^(n-2) + x*∑nanx^(n-1) + ∑anx^n = 0 ∑n(n-1)anx^(n-2...
September 20, 2016

math - eh?
You want to try that again in English?
September 20, 2016

Math Question
why are there 4 empty squares? Or are some of the numbers used more than once?
September 20, 2016

maths
c+s+h = 100 5c + s/10 + 2h = 100 There is no unique solution if that is all you are given. And the plural of sheep is sheep, not sheeps, and certainly not sheep's!
September 20, 2016

Math
just multiply 5 by the desired value(s)
September 20, 2016

physics
no friction means no force no force means no acceleration no acceleration means constant velocity.
September 20, 2016

maths calculus need help plz
this is a pretty standard linear DE. Read about its method of solution here: https://answers.yahoo.com/question/index?qid=20120112065721AA0UzfI If you're still confused, there are lots of explanations on why the method works so well.
September 20, 2016

Math
recall that the angles of a triangle sum to 180°. So, you must have 2x+5 + 6x-5 + 7x = 180
September 20, 2016

ALGEBRA
(212-32) = 180 SO, there are 180°F for 100°C So each °F is 5/9 as big as a °C each °C is 9/5 as big as a °F That should help you get started.
September 20, 2016

Math
really? How many times larger is 20 than 4? How did you get that answer? Do the same thing for your numbers. Remember that you divide the values and subtract the powers. What do you get?
September 20, 2016

Matg
Luckily, the 3' width of the rolls divides either dimension of the room, so you don't have to worry about buying extra rolls for the leftover width. Carpet Master: (720*30 ft^2) * 1roll/6ft^2 * $1/roll = (720*30*1/6*1) = $3600 Flooring King: (720*30 ft^2) * 1roll/36ft^...
September 20, 2016

physics
oops: watch the units (66.4km/hr) / (t hr) = 66.4/t km/hr^2 I'd say: total distance: 99.5(t - 24/60) avg speed = distance/time 99.5(t - 24/60)/t = 66.4 t = 1.202 distance is thus 99.5(1.202 - 24/60) = 79.8 km
September 20, 2016

Maths Constructions
you can construct a right angle by making a perpendicular bisector of a line segment. That's one of the very first constructions you did. Mark the right angle as point B. Then, mark off side BA. Then from A, set the radius to 6.2cm and draw an arc that intersects the ...
September 20, 2016

Math
Let C = {4,5} Then A = {2,C,4} They are all incorrect, and it should be clear why. What are your reasons?
September 20, 2016

Algebra
since distance = speed * time, (s-50)(5) = (s+50)(4.5) That's some fast plane!
September 20, 2016

Precalculus
For the inside argument, the domain is all real numbers except where the denominator is zero. If your denominator is -x^2-4x-10 it is never zero, since the discriminant is 16-40 < 0 So, the domain is (-∞,∞) Now, for the log to be defined, we need 10+|x+6|/(-x^2-...
September 20, 2016

Algebra
g = b+16 g+13 = 2(b+13) now just solve for g and b.
September 20, 2016

math
no, 2+2 = 4
September 20, 2016

science
Since PV=kT, PV/T is constant. So, you want T where (1.41)(25.1)/T = (1.82)(18.7)/353
September 19, 2016

Calculus
yes, k=2
September 19, 2016

Pre algebra
-12/(3(-8+(-4)^2-6)+2) -12/(3(-8+16-6)+2) -12/(3(2)+2) -12/8 -3/2
September 19, 2016

Math
Do you mean 8*4^(2x) - 4 = 53 8*4^(2x-4) = 53 either way, isolate the 4^? and then take log of both sides to get x by itself on the left.
September 19, 2016

math
a. The power of an electric appliance is given by the formula P=I^2R, where I is the current and R is resistance. Use this information to explain how you can use radicals to determine the current if the power and the resistance is given. b. Find the current in amperes if a 40-...
September 19, 2016

MATH
can't see, but I'd bet that it's √2 times the value shown.
September 19, 2016

Math please help
It does not matter! Pick any number you like. Just be sure to use it both top and bottom. I know you have trouble with math, but I was hoping you could understand English...
September 19, 2016

Math please help
starting with 5/6, multiply both top and bottom by the same number, such as 3: 5/6 = 15/18 Now fill in the other blanks.
September 19, 2016

Grade 10 Math
As always, draw a diagram. She is standing 3 ft from where the wire is attached to the ground. Using similar triangles (in inches), the height h can be found by 69/36 = h/180
September 19, 2016

Algebra
Ab^2 = -18 A(3^(1/5))^2 = -18 A(3(2/5)) = -18 A = -18 * 3^(-2/5) = 18 / 9^(1/5) = 2 * 9^(4/5) It would be nice if you showed your work ...
September 19, 2016

Algebra
Ab^-3 = -6 Ab^2 = -18 divide to get rid of the A's and you have b^-5 = 1/3 b^5 = 3 b = 3^(1/5) Now use that to get A
September 19, 2016

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