Tuesday
September 27, 2016

Posts by STEVE

Total # Posts: 44,152

calculus help me asap
this is just stupid. y^6 = tanh^-1(u)^9 6y^5 y' = 9 tanh^-1(u)^8 * 1/(1-u^2) du/dx where u = tan^-4(v^2) and v = 4x^2+y^2 = cot^4(v^2) du/dx = 4 cot^3(v^2) (-csc^2(v^2)) (2v dv/dx) dv/dx = 8x + 2yy' mash all that together and solve for y' I see little to be gained ...
September 19, 2016

Maths
well, 40 = 5*8 55 = 5*11
September 19, 2016

Maths
not sure what the :||+|| means and it appears you have too many = signs but yes, 2*2 = 4
September 19, 2016

math
3d+2t = 8 3d+3t = 9 clearly, t=1
September 19, 2016

Math 115
for 100 < P, C(P) = 100 + 0.72(P-100) or C(P) = P - 0.28(P-100)
September 19, 2016

Math 115
for 30 < t <= 40, D(t) = D(30) = 2 for 40 < t <= 65 D(t) = 2 + (1/60)(t-40)
September 19, 2016

math
60/x = sin30°
September 19, 2016

Math115
t is in minutes, and D is in miles. Since the speed is given in mi/hr, you have to divide that by 60 to get mi/min
September 19, 2016

Math115
why all the words? Just say D(t). I'll do the first piece. See what you can do with the rest. Starting from t=0, having gone 0 miles so far, D(t) = 0 + 4/60 (t-0) for 0 <= t <= 30 = 1/15 t That may seem cumbersome, but therein lie hints for the other parts.
September 19, 2016

Algebra
since the slope m is constant, (13+5)/(3-r) = m You have not included the value of m, but once you divulge that secret, you can find r.
September 18, 2016

math
since the model is 1/16 as big, just divide all the dimensions by 16: boat: (17/16) ft car: (20/16) ft You might want to express those in inches
September 18, 2016

Math
x^2 - 2x it's as valid as any other expression.
September 18, 2016

Physics
v = 9.8t s = 100 - 4.9t^2
September 18, 2016

College Algebra
why the inconsistency? Either say 4 less than t less than or equal to 6 or, my favorite, 4 < t <= 6 For that piece, we have C(t) = 4 for 4 < t <= 6 see what you can do with the others.
September 18, 2016

Math
how come you can say + but cannot say - ???? 1/4 + 2/7 + 11/12 - 3/4 = 2/7 + 11/12 - 1/2 = 24/84 + 77/84 - 42/84 = ...
September 18, 2016

Math
(81+11 - 8*4)*1 = 60
September 18, 2016

math
355-2 < v < 355+2
September 18, 2016

physics
without relying on friction, I assume you mean that the cars scrape along the wall, since they cannot grip the road without friction.
September 18, 2016

Math
total = each * number
September 18, 2016

physics
just figure total load weight so that it equals the weight of the air displaced.
September 18, 2016

math
you need to distinguish between asking a question and giving instructions. Question: What is the total number of acres planted? Instructions: Compute the total number of acres planted. Now that the English lesson is done, on with the math ... Just add up the amounts. The LCD ...
September 18, 2016

MathEmatics
yes why not just write 1/20?
September 18, 2016

Physics
going across the puddle, s = 20t - 1/2 at^2 = 25 v = 20 - at = 5 solve for a and t.
September 18, 2016

Math
how many face cards are there? chance of getting 1: ? with one missing, chance of getting another: ? multiply the two.
September 18, 2016

Calculus III
For P:(x,y,z) distance from P to the x-axis: √(y^2+z^2) distance from P to the yz-plane: x So, √(y^2+z^2) = 4x y^2+z^2 = 16x^2 x^2/1 - y^2/16 - z^2/16 = 0 I'll get back to you on the rest.
September 18, 2016

English
only #1 is clear and concise. #5 is more explicit, but in a classroom setting, I think #1 implies #5. You certainly don't want to talk about the summary, rather than the passage.
September 18, 2016

Math
14*2/7-3+9 = 10
September 18, 2016

Math
it's even easier to see if you call them x-2, x, x+2 what's the sum?
September 18, 2016

Math
there are 5 choices, but only 1 is a success. So, that means there are 4 wrong choices. The odds are 4:1 against, or 1:4 in favor. The probability of a 5 is 1/5. odds are the ratio of success:failure
September 18, 2016

Math
3*4 = 12 3*5 = 15 so, ...
September 18, 2016

math
e^x: 2.718 7.389 20.08 54.598 148.413 403.428 so, it grows faster than e^x as x gets large maybe e^(kx^2) can be adjusted some. Since it is not at all obvious (to me), and since there are only 6 data points, it will be e possible to fit any suitable polynomial or exponential. ...
September 18, 2016

Math 2
Hmmm. √3 sinx = 2+cosx 3sin^2(x) = 4 + 4cosx + cos^2(x) 3 - 3cos^2x = 4 + 4cosx + cos^2(x) 4cos^2(x) + 4cosx + 1 = 0 (2cosx + 1)^2 = 0 cosx = -1/2 Looks like that is a good starting point. Check for extraneous solutions.
September 18, 2016

math
I'm sure you can find the area A of a right triangle. The volume of the prism is just V = A*length
September 18, 2016

Math
the area scales as the square of the ratio, so it will be 800 * (3400/5000)^2
September 18, 2016

Math
total points: 60*100 top 30: 30*80 Now see how many points you have to divide among the other 70 students.
September 18, 2016

math
576/9 = 64 So, there were 4*64 muffins 5*64 cookies
September 18, 2016

math
x + 38b = 2.13 x + (38-26)b = 0.96 now just solve for x.
September 18, 2016

Algebra
first, find t. I assume these are speed * time calculations. Once you have t, use either expression to find the distance.
September 18, 2016

Maths
9/30 = 30% which had marks. So, we assume that 60 = 30% of the total.
September 18, 2016

Math
online we use ^ for powers. So, a^2 + x^2 = 4^2 x^2 = 16-a^2
September 18, 2016

Math
(x+5)/x = 4/3
September 18, 2016

Algebra2
thank you
September 18, 2016

Algebra2
well, it is clear that x = 8-y-z plug that into the other two equations. Then make a final substitution there for y or z.
September 18, 2016

Algebra2
Solve the system by substitution -x-y-z=-8 -4z+4y+5z=7 2x+2z=4
September 18, 2016

Algebra2
visit http://www.gregthatcher.com/Mathematics/GaussJordan.aspx for all the details.
September 18, 2016

Algebra2
Solve the system by elimination. -2x+2y+3z=0 -2x-y+z=-3 2x+3y+3z=5
September 18, 2016

mount ayliff comprehensive high school
Go west, young man.
September 18, 2016

algebra
x: side of smaller square x+4: side of larger square (x+4)^2 = 4x^2 - 14
September 18, 2016

math
3:1 = 540:180
September 18, 2016

Algebra
see related questions below
September 18, 2016

maths
50 sin70° time to review the basic trig functions and right triangles. And ships sail on headings, not bearings.
September 18, 2016

mathematical physics
well, you have M = xy N = x^2y^2 so the integral is just ∫∫R (Nx - My) dx dy Along y=0, dy=0, Along x=1, dx=0, Along y=2x, dy = 2dx Now just break the boundary into three parts, and evaluate each part. Watch the direction of the limits.
September 18, 2016

Maths
net fill rate: 40L/min so figure the volume filled in 15 min.
September 18, 2016

science
Try retyping using the characters < <= > >=
September 18, 2016

Maths Exponents
11 x 10^-5 = 1.1 x 10^-4 The distance would be 1.496E11 - 3.84E8 = 1.496E11 - 0.00348E11 = ...
September 17, 2016

mathematics
work with the costs for x km: 250+.22x 96+.5x
September 17, 2016

Math
Online you needed parentheses so things are not ambiguous. You want a common denominator, so note that x^2+x-12 = (x+4)(x-3) x^2-16 = (x+4)(x-4) Now you can see that the LCD is (x+4)(x-4)(x-3) and work with that.
September 17, 2016

Math
as with all problems of addition of fractions, you want the LCD. In this case, that is 30m. Now add things up the way you always do with fractions.
September 17, 2016

maths need help
I'll take a stab and say that the road is 1m away from the field. So its inner radius is 41 and its outer radius is 42. So, the cost is rate * area = π(42^2 - 41^2) * 26
September 17, 2016

math
what are all these broken lines? Just type the numbers you want to use. And if you want to use fractions, just type them normally, as in 3/4, 1/8, etc. I spell copy/paste from some word processor. A big clue is the garbled line feeds and the em-dash minus signs.
September 17, 2016

English
thank you
September 17, 2016

English
What type of pronoun is used in the following Sentence Under the most splendid house in the city is still to be found the cellar where they store their roots as of old? a- personal b- reflexive c- indefinaite d- interrogative my answer is a
September 17, 2016

Advanced Functions 12
You need f(f^-1(x)) = x -√(x^2-2 + 2) = -√(x^2) = -x this fails because x^2 is not one-to-one
September 17, 2016

PRE-CAL
can't see the table, but you have correctly solved for t.
September 17, 2016

Math
so, what are you trying? Apparently you have done some work, so show us how far you got. It's probably just something simple.
September 17, 2016

math
since e+e = e e=0 now pick any h&m that add to less than 10
September 17, 2016

algebra
Fix your typo. You have two "=" signs Your choices are garbled, as well.
September 17, 2016

Business maths
if the cost is c and the marked price is p, then .70 * p = 1.25c = c+91 .25c = 91 c = 364 p = 1.25*364/.7 = 650
September 17, 2016

Math
using the quadratic formula, we have x = [-(k+2)±√((k+2)^2 + 12k)]/2k For the roots to be real, we need (k+2)^2 + 12k >= 0 -8-√60 <= k <= -8+√60 Now, we want the roots to be positive, so we need [-(k+2)±√((k+2)^2 + 12k)]/2k > 0
September 17, 2016

math
π*45^2*130 --------------- 1.2445
September 17, 2016

Math
rice: 11/18 (7/18 left) tomatoes: (3/7)(7/18) = 3/18 (4/18 left) spinach: (1/4)(4/18) = 1/18 (3/18 left) ...
September 17, 2016

maths
ok. that was fun.
September 17, 2016

Maths
.3x + 20 = .8x
September 17, 2016

College Algebra
your functions are correct. You need to find out what syntax the software expects. Maybe you could try using fractions: D(t) = t/20 0<=t<=25 5/4 25<t<=40 5/4 + t/60 40<t<=70 or maybe the x's confused it.
September 17, 2016

Maths
try figuring how many do contain a five? Then subtract that from the number of 3-digit values.
September 17, 2016

maths
eh? eh? try using some parentheses, as you can see that the online formatting is poor. At least some spaces, to indicate breaks. And are those exponents, as in m^3 = m cubed
September 17, 2016

algebra
(3 ozAg) * (1 ozAu)/(s oz Ag) * $d/(10 ozAu) = $(3d / 10s)
September 17, 2016

Math
correct
September 16, 2016

Math
$3.60 * (2/6) = $1.20
September 16, 2016

algebra
w(w+4) = 7w+18
September 16, 2016

Algebra
4*86 <= 84+84+88+x <= 4*90
September 16, 2016

Advanced Functions 122
for every integer k, x = k*360°, y is undefined.
September 16, 2016

Advanced Functions 12
if I decipher the question correctly, the answer is no. y = x^3 + 4 has odd end behavior, but is not an odd function.
September 16, 2016

linear programming
or visit http://www.zweigmedia.com/RealWorld/LPGrapher/lpg.html and it will show you how it's done
September 16, 2016

partial maths
wolframalpha.com can verify your answer. http://www.wolframalpha.com/input/?i=partial+fractions+x%5E3%2F(5x%5E3-1) This one is kinda nasty, since 5x^3-1 does factor, but not with integer coefficients. It's a difference of two cubes, so it factors as (∛5 x - 1)(∛...
September 16, 2016

statistics
total points: 10*24 = 240 after removal of 42, you have 9 scores with a total of 198. So, ...
September 16, 2016

maths helpppppp me asap plz
∑1/n diverges, so there is no LUB
September 16, 2016

math
Come on - this one is easy. You have z+7+5 ends in 4 7+5=12, so z=2 Now work with that same idea to get x. Remember that no one said that x,y,z had to be different from all the other digits already present.
September 16, 2016

calculus plz help me
r = (1+y'^2)^(3/2) / |y"| y^2 = 4ax, so y = 2√(ax) y' = a/√(ax) y" = -a^2/(2(ax)^(3/2)) = -a/(2x√(ax)) so just plug it in: (1+y'^2) = 1+a/x r = ((a+x)/x)^3/2 * 2x√(ax)/a = 2(a+x)^(3/2) / √a
September 16, 2016

algebra - incomplete
I guess that would depend on the size of the lids, eh?
September 16, 2016

College Algebra
1/4 of a complete circle, so π/2 (16^2 - 12^2) in^2 that's assuming that the blade extends to the end of the wiper arm. how do you now what automobiles suppose?
September 16, 2016

calculus need help
Just use the formula: r = (1+y'^2)^(3/2) / |y"| 3ay^2 = x^3-2ax^2+ax 6ay y' = 3x^2-4ax+a y' = (3x^2-4ax+a)/(6ay) y" = [(6ay)(6x-4a) - (3x^2-4ax+a)(6ay')]/(36a^2y^2) Now just plug in (3a,2a) and crank it out. Messy algebra, but not difficult.
September 16, 2016

Physics
for each body, F=ma So, get the acceleration, and then using s = 1/2 at^2 add the two distances and find t when their sum is 504m
September 16, 2016

math
2/9 v - 2/3 v = -4/9 v so, you have -4/9 v = 1 v = -9/4 You are clearly just guessing, or there are typos in your problems Did you actually try your answer to see whether it made the equation true?
September 16, 2016

math
I assume you mean (1/3)(b+4) = 1/2 b+4 = 3/2 b = -5/2 If you really want b=2, then 1/3 * (2+4) = 1/3 * 6 = 2 not 1/2
September 16, 2016

Physics
h(t) = 3.00 + 17.8 sin53.0˚ - 4.9t^2 find t when h=0 Then, recall that the upward speed is vy = 17.8 sin53.0˚ - 9.8t vx = 17.8 cos53.0˚ the final v is of course found by v^2 = vx^2 + vy^2
September 16, 2016

Science
well of course you don't. That's why I told you that distance = speed * time So, for each part of the trip, multiply the speed by the time. Then add those two numbers.
September 16, 2016

Science
wrong. distance = speed * time, not speed/time (and you can't figure 80/1 = 80?) If you had watched your units, you'd have seen that (60km/hr) / (2hr) = 30 km/hr^2 when you wanted km
September 16, 2016

math
$200/30hr = $6.67/hr
September 16, 2016

math
since all 4 sides are equal, the base is 6. A = bh = 42 h = 7
September 16, 2016

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