Saturday
August 27, 2016

Posts by Steve

Total # Posts: 42,820

Math
see related questions below
August 23, 2016

Math
(5600*.95)*1.10 = .95p
August 23, 2016

math
6 = 2*3 so, 3 times as far as he went in 2 hours.
August 23, 2016

maths
since cos(a+b) = 0, a+b = pi/2 so, b = pi/2 - a and sin(a-b) = sin(a-pi/2+a) = sin(2a-pi/2) = -sin(pi/2 - 2a) = -cos(2a) or, since a = pi/2 - b = -cos(2(pi/2-b)) = -cos(pi-2b) = cos(2b)
August 23, 2016

Geometry
just use the distance formula for each segment.
August 23, 2016

Math
if the first vertex is at (1,0), then the others are at (cos 2kπ/7, sin 2kπ/7) for k=1..6
August 23, 2016

Math
$5.50 no matter how many hours. Now, if you want an hourly rate, well, duh -- divide the money by the time: $/hr
August 23, 2016

physics
series: R = 6 parallel: R = 1/6 Other arrangements will produce values in between those.
August 23, 2016

Maths
well, with those two roots, f(x) = (x+2)(x-3) so expand that and you can see what p and q must be.
August 23, 2016

Math
5 is 3 * 5/3 So, the distance is (5/3)(189)
August 23, 2016

algebra
google your question. Much faster than waiting around here: https://www.google.com/#q=metric+ton
August 23, 2016

Urgent help! Physics
Vx = v cosθ Vy = v sinθ h(t) = Vy*t - 5t^2 ball stops when h=0 ball has traveled Vx * t along the ground.
August 23, 2016

Algebra
n = 6+4 "exceeds" and "more than" indicate addition. See what you can do with q.
August 23, 2016

Math
2/5 + 1/5 + 1/x = 1 x = 5/2
August 23, 2016

Math
Just list the possibilities. You know there are 36 total outcomes. How many fit the conditions? R B R-B 1 1 0 1 2 -1 1 3 -2 2 1 1 2 2 0 2 3 -1 2 4 -2 ... 4 6 -2 Then divide the successes by the total of 36
August 23, 2016

Math
so, she picked 2*35 + 15
August 22, 2016

maths
If there are x liters of 25/L then we have the value of the milk as 25x + 30(60-x) = 1600
August 22, 2016

math
distance = speed * time, so (1/2 hr) * (y mi/hr) = y/2 mi
August 22, 2016

Math
4/(5+4+y)
August 22, 2016

phy
the waves are a sin(x) and b sin(x-k) add them up and you have a sinx + b(sinx cosk - cosx sink) = (a+b*cosk)sinx - (b*sink)cosx This is basically just Asinx + Bcosx which can be reduced to a single sine wave of amplitude √(A^2+B^2) See a nice discussion at https://en....
August 22, 2016

pre caluclus
since you give only one focus, I assume it's a parabola. Since both points lie on the line y=2, the parabola opens horizontally. Recall that y^2 = 4px has focus at (p,0) and vertex at (0,0) Your parabola has obviously been shifted up by 2, so it will be (y-2)^2 = 4px Your ...
August 22, 2016

Math
just recall that supplementary angles add to 180, so 4x+3 + 3x-5 = 180 Now just solve that for x.
August 22, 2016

Algebra 1
the first step is usually to clear all the fractions by using the LCD. In this case 12. Do that and you have z/3 - 3 = z/4 + 7 4z - 36 = 3z + 84 z = 120 Or, you can collect terms as usual, and then clear fractions z/3 - 3 = z/4 + 7 z/3 - z/4 = 10 (1/3 - 1/4)z = 10 1/12 z = 10 ...
August 22, 2016

algebra
These are all difference of squares or sum/difference of cubes. You need to be able to recognize such values, and apply the formulas: a^2-b^2 = (a-b)(a+b) a^3±b^3 = (a±b)(a^2∓ab+b^2) For example, 16x^4a-y^8a = a(16x^4-y^8) = a(4x^2+y^4)(4x^2-y^4) = a(4x^2+y...
August 22, 2016

Algebra
since V is proportional to r^3, V(2r)/V(r) = 2^3 gather all the constants into a single k, and you have V(r) = kr^3 V(2r) = k(2r)^3 = k(2^3)(r^3) = 2^3*V(r)
August 22, 2016

math
one every polynomial of degree n has exactly n solutions.
August 22, 2016

Algebra 1a
no kidding. In big letters on the home screen it says Post homework questions online a general whine is not a homework problem.
August 22, 2016

Math
2450 - 2549 but I must say I do not care for the way the question was worded.
August 22, 2016

Algebra
√(3x-6) = 4 3x-6 = 4^2 = 16 3x = 22 x = 22/3
August 22, 2016

Algebra
3c^2 - 5c - 7.8 = -2.2 3c^2 - 5c - 5.6 = 0 Now just use the quadratic formula
August 22, 2016

Math
correct
August 22, 2016

Algebra
well, you know that y = 3.8x+2.2 so use that in the other equation to get 4.5x - 6.7(3.8x+2.2) = 8.6 4.6x - 25.46x - 14.74 = 8.6 now it's easy, right? Then, once you have x, use that to get y.
August 22, 2016

Math
1st step: subtract 5.514 from both sides: 9.2x = 152.72 I guess you can figure out what's next, no?
August 22, 2016

Algebra
65.9 - 32.4k/9.9 = 13.3k 65.9 - 3.28k = 13.3k Think you can handle that now?
August 22, 2016

Absolute Value
all correct.
August 22, 2016

Algebra
why all the words? You showed the math. Just solve the way you normally would; don''t let the fractions confuse things. 1/2.75 = 1/3.2 - 1/x 1/x = 1/3.2 - 1/2.75 1/x = (2.75-3.2)/(3.2*2.75) x = (3.2*2.75)/(2.75-3.2) = 8.8/-0.45 = -19.556 Or, just convert to decimals at...
August 22, 2016

math
sheet area: 32*24 buttons area: 64 * π * 3.5^2 now just subtract
August 22, 2016

algebra 1 please help
just plug in your numbers: (81+125)/2 * 75
August 22, 2016

MATHS (EQUATIONS)
.8x + .9y = 240
August 22, 2016

Maths
ooops. Misplaced the decimal point. I'm sure you can fix it.
August 22, 2016

Maths
juice: 9% of 120L = .09*120 = 1.08L And so on
August 22, 2016

Maths
it's a line: http://www.wolframalpha.com/input/?i=-3x%2B2y%3D-6
August 22, 2016

American Government
nope - that's what the Supreme Court decides
August 22, 2016

math
well, 36000000 * 6 = 600^3
August 22, 2016

Math
same answer using the exterior angles, which sum to 360°
August 22, 2016

science
straight lines have a constant slope. That is often written y = kx In this case, the quantities have different names, but it should be clear which choice is correct if you just use your names instead.
August 22, 2016

science
hint: it's called a half-life for a reason.
August 22, 2016

algebra
i = kpt, so if p is the same, i/t = pk is constant. Thus, you want i such that 960/6 = i/7 That is, since 7 is 7/6 as big as 6, the interest will be 7/6 * 960
August 22, 2016

math
If the cardboard is x by y, then xy = 160 2(x-4)(y-4) = 144 Now just solve for x and y.
August 22, 2016

ALGEBRA
time = distance/speed, so if he rode x miles on the bike, x/43 + (281-x)/3 = 7 solve for x, and then x/43 is the time on the bike.
August 22, 2016

maths
If the number is x, then x = 10t+5 so, 10t+5 = 7(mod 11) 10t = 2(mod 11) so, which multiple of 10 leaves a remainder of 2 when divided by 11? How about 90 = 88+2? So, t=9 95 = 10*9+5 = 11*8+7
August 22, 2016

Math 2
That's phi, not phe Ø-1 = 1/Ø Ø^2-Ø-1 = 0 Ø = (1±√5)/2 pick the positive value
August 21, 2016

physics
time = distance/speed( m / m/s = s) avg velocity is totaldistance/totaltime so, that gives (95.0+95.0)/(95.0/1.26 + 95.0/3.61)
August 21, 2016

Calculus
you know that sin(x) is negative in QIII and QIV sin(.294) = 0.29 so, you want the numbers π+.294 and 2π-.294
August 21, 2016

Calculus
You know that lim sinu/u = 1, so sin2x/5x = sin2x/2x * 2/5
August 21, 2016

Algebra
If you meant |t| -2 = -1 |t| = 1 then B
August 21, 2016

Maths Mensuration
2π*3 * 14
August 21, 2016

Maths Mensuration
A(r) = πr^2 A(r+h) = π(r+h)^2 now subtract.
August 21, 2016

Mathematics
then f(0) = -1 But then, that may not be what you were after ... Hard to say, since you did not. But it does factor easily, right? It's just Algebra I
August 21, 2016

chemistry
So, first step: decide on the partial equations. There's a good discussion here: http://chem-guide.blogspot.com/2010/03/balancing-chemical-equations.html
August 21, 2016

chemistry
how many moles in 5g of Al? The equation says you will use 3/2 that many moles of Ag2S So, convert that back to grams of Ag2S of course, the amount of jewelry will be proportional to its surface area, not its volume.
August 21, 2016

maths
Hmmm. 24 = 2*10 + 4 24 = 2*11 + 2 You want to try that again?
August 21, 2016

Calculus
The two pieces are of length x and 100-x Since a square has four equal sides, A(x) = (x/4)^2 + ((100-x)/4)^2
August 21, 2016

Math
15mn = 15nm = (15n)m (15n)m/m = 15n
August 21, 2016

maths
but it's not!
August 21, 2016

control structures
I assume you can do the I/O The calculation is discount = (purchases > 30000) ? 0.10 : 0.02; drop that into a while loop and The I/O and you're done
August 21, 2016

pre-cal
draw a diagram review your trig functions. You will see that the height h can be found using h cot48 - h cot64 = 22
August 21, 2016

Math
area goes up as the square of the scale, so you would have 180 * 100^2 m^2 Now just convert that to hectares
August 20, 2016

Math
again? the real question is why you keep tossing in spurious apostrophes!
August 20, 2016

Math
a+w+c = 25 25a+400w+50c <= 2500 You will get a range of fruits. Or, just start with 6 watermelons cost $24 so, what can you buy with the other dollar? Not enough to make up 25 fruits. So, consider 5 watermelons for $20 Now you have $5 for the other 20 fruits. and so on
August 20, 2016

Algebra
the domain is all reals except where the denominator is zero. So, when is x^2-49 = 0 ? For the hole, note that 2x+14 = 2(x+7)
August 20, 2016

algebra
it hits the ground when the height is zero. So, just solve 256-16t^2 = 0 (16-4t)(16+4t) = 0 ...
August 20, 2016

PHYSIC
work = force * distance so, plug in your numbers.
August 20, 2016

MATHS
try using some easy numbers first. if buying 10 lbs, his scale says he is only getting 11 lbs. His selling scale says he is selling 9 lbs. See what you can do with that. Looks to me like he's losing money. Unless somehow the buying/selling is from the customer's ...
August 20, 2016

calculus
lim (e^-u^2-1)/u^2 = lim (-2u e^-u^2)/2u = -1 Now let u^2 = x^2+y^2
August 20, 2016

Math
I'll have to see where you went wrong. Too bad you didn't show your work, like me. wolframalpha says you are off: http://www.wolframalpha.com/input/?i=3+sin(+pi%2F3+(t-+((4-pi%2F2))))+-1
August 20, 2016

Math
v = A sin(B(t-C))+D max v = D+A = 2 min v = D-A = -4 So, D = -1 and A = 3 v = 3sin(B(t-C))-1 max of sinθ occurs at θ = π/2 max of sinθ occurs at θ = 3π/2 so, see what you can do with that, the way I git A and D above. Recall that the period of sin...
August 20, 2016

math
The Remainder Theorem states that the remainder is f(a). So, that means we have a^3-a^2+4a = a^3+6a+10 a^2+2a+10 = 0 This has no real solutions. I suspect a typo As written, P is never greater than Q. See http://www.wolframalpha.com/input/?i=plot+x%5E3-x%5E2%2B4x+,+x%5E3%2B6x%...
August 20, 2016

math
The look good to me. Nice work.
August 20, 2016

science
why bother asking here? google will give you immediate feedback. as will your class text!
August 20, 2016

science
uh, which data?
August 20, 2016

Math
The shares are 3x and 4x. They tell you also that 4x = 3x+6
August 20, 2016

Algebra
ok. you have x+y = 13 The value of the number is 100x+y So, reversed, it's 100y+x. So, your second equation is 100y+x = 100x+y + 297 Now just solve for x and y.
August 20, 2016

math
72 = 2^3 * 3^2 504 = 72 * 7 So, now what do you think?
August 20, 2016

math
Since 57 and 22 have no common factors, stones of 50cm will do the job. In cm, the GCF(5750,2200) = 50 So, how many stones will that take?
August 20, 2016

Math
use the info they gave you: 2x + 40 = 75 - 3x Now just find x.
August 20, 2016

Maths Algebra
d = 2v d-v = 11 Now just find d and v. Not sure what you mean by saying that after 18 years ,their ages will be twice They can't both be twice as much.
August 20, 2016

Maths Mensuration
as always for parallelograms, area = base * height and of course, cost = area * rate you can either convert the rate to cost per dam^2, or convert the area to m^2
August 20, 2016

Maths discount%
.80 * .90 = .72 so how much discount is that?
August 20, 2016

math
use the SSS property, since the diagonal is common to both triangles, and the parallel sides are congruent.
August 20, 2016

CHEMISTRY
it has no fixed crystal structure. google can provide further discussions on the topic.
August 20, 2016

Finance
just plug your numbers into the formula for the present value of an annuity. I'm sure you have one. If not, google does.
August 19, 2016

Math
well, that's (x+1)(1+2+3+...+1000), right?
August 19, 2016

physics
well, work = force * distance force = mass * g so,...
August 19, 2016

Calculus
well, what happens at each dividing point? At x = -1, the limit is 0 on the left, and -1 on the right. No good. Try the others; if the left and right limits are the same, lim f(x) exists.
August 19, 2016

Math
17.6 - 16.7 = ?
August 19, 2016

math
t = 3j t-j = 32 so, 3j-j=32 2j=32 j=16 so, t=3j=48
August 19, 2016

please help with this trigonometric identity!
For clutter reduction, let's let x = (a+b)/2 y = (a-b)/2 using the sum-to-product formulas, cosa-cosb = -2 sinx siny sina+sinb = 2 sinx cosy sina-sinb = 2 cosx siny cosa+cosb = 2 cosx cosy Now we just have -tany + tany = 0 seems legit to me.
August 19, 2016

Math
well, 5x^2+4x = x(5x+4) that should help
August 19, 2016

Science
PV=kT since P and T are constant, so is V. That is, V = (23 * 4/3 pi * 15^3)
August 19, 2016

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