Wednesday
September 28, 2016

Posts by steve

Total # Posts: 44,164

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

Algebra
just do what you always do. It does not matter whether the symbols are variables or constants. a(x+y) + bz + c = d ax + ay = d-bz-c ax = d-ay-bz-c x = (d-ay-bz-c)/a Clearly, a cannot be zero. Otherwise, all's fair in love and algebra.
September 16, 2016

Math
and even lots of apostrophes! (well, one, anyway)
September 16, 2016

maths
or, it is 5log3 - (3log2 + log3 + log5) - (log2 + 3log3) + (log3 + 2log5) + (3log2 + log3) - 3log3 - log5 + log2 = 0
September 16, 2016

math
Suppose there are x people in A and 2x people in B. Now figure the total weight and divide by the total population.
September 16, 2016

Physics
initial upward speed is 20 m/s h(t) = 160 + 20t - 4.9t^2 when is h=0?
September 16, 2016

Math
Let's say that the three times to traverse AB,BC,CD are x,y,z respectively. They add to 5 min. The time to accelerate is the same as the time to decelerate, so x=z. If the acceleration is a m/s^2, we have x+y+z = 5 1/2 ax^2 = axy 1/2 ax^2 = axz - 1/2 az^2 We can factor out...
September 15, 2016

physics
when the can passes, 256 - 4.9t^2 = 256 - 32.0t use that value of t for v = -9.8t
September 15, 2016

Physics
you know that (a) R = v^2/9.8 sin2θ (b) h(t) = v*sinθ - 4.9t^2 solve for h=0
September 15, 2016

Algebraic expression
yes, that is an expression
September 15, 2016

Physics
42 micro-tons
September 15, 2016

Maths
is this 4 separate problems? If so, do them all the same way: just add up the quantities: (a) 250+150 = 400
September 15, 2016

math
V(t) = 51500 - (51500-43200)/3 t Now just find t when V=0.
September 15, 2016

Calculus AB
f(0) is undefined, but the limit is -1 at x=0. So, there's a removable discontinuity at x=0. Naturally, at x=1, f is undefined; there's an asymptote there. Take a look at the graph for further justification of your analysis: http://www.wolframalpha.com/input/?i=ln%7Cx-...
September 15, 2016

Math
no. no matter how you "express" a number, it does not change its value.
September 15, 2016

Math
under power h = 14.7*4^2 = 235.2 v = 29.4*4 = 117.6 on a ballistic path, h = 235.2 + 117.6t - 4.9t^2 max height is at t = 117.6/9.8 plug that into h to find the height.
September 15, 2016

Math
ok - I'll assume that that you have had some physics exercises where you have learned that with acceleration a and initial velocity v, s = vt + 1/2 at^2 Since v went from 0 to 6 in 6 seconds, a = 6/6 = 1 m/s^2 So, to get the distance during acceleration, you have s = 0*6...
September 15, 2016

Math
if you have not studied calculus yet, what methods have you studied that relate distance to speed? There must be similar problems in your text.
September 15, 2016

Math
distance is the integral of the velocity. You have defined v(t) as a piecewise function. v(t) = t for 0<=t<=6 6-(3/2)(t-6) for 6<=t<=10 the distance is thus ∫[0,6] t dt + ∫[6,10] 15-(3/2)t dt
September 15, 2016

Algebra II
y = kx So, y/x = k is a constant. You want x such that (-5/8)/(3/2) = (2/5)/x x = -24/25
September 15, 2016

math
nope. not if all the socks of one color are identical. In any case, you have not defined what an event is. If the event is "pick a sock" then there are 2 outcomes: B or W.
September 15, 2016

Algebra
$54,922 But he's gonna get his legs broken long before the bill is that high.
September 15, 2016

Math
if there are $x at 13%, then the rest (7000-x) is at 2%. So, just add up the interest from each. It needs to be $300: .13x + .02(7000-x) = 300
September 15, 2016

Math
when you're dealing with quantities where getting the nearest 100 is good enough. That's the whole point of rounding. If you're estimating the size of a concert crowd, who cares whether there are 1623 or 1630 people there? You might want to say that there are ...
September 15, 2016

math
http://www.jiskha.com/display.cgi?id=1473970501 now start thinking some. You can answer all the other questions using those functions. Recall that x represents the number of months. Use it to figure the membership costs involved.
September 15, 2016

Math
well, how much do you add to get to the next consecutive integer?
September 15, 2016

math
Using the functions I already gave you: G = 59.00 + 19.50x W = 149.00 + 9.50x you want to find when the costs are equal. Well, duh -- set the two values equal and see which value of x makes it so: 59.00 + 19.50x = 149.00 + 9.50x 10x = 90 x = 9
September 15, 2016

math
already did. can you make a stab at this one? Use the equations I gave you earlier.
September 15, 2016

math
G = 59.00 + 19.50x W = 149.00 + 9.50x Next I suppose you'll ask which is a better buy, or when the costs are equal. First, try to figure that out using the above functions.
September 15, 2016

math
42x
September 15, 2016

Physics
I agree on B inst. vel. is the slope of the line at a point.
September 15, 2016

Math (pls check my answers!!)
correct
September 15, 2016

Geometry
If we call the midpoint M, then the coordinates of M are halfway from U to V. M = (5,-11) = (3,5)+(2,-16) V = (5,-11) + (2,-16) = (7,-27)
September 15, 2016

PHYSICS
still no question there. But the speed home is 7/3 the speed leaving
September 15, 2016

Math
correct
September 15, 2016

Algebra
nope. since |4| = 4, -|4| = -4
September 15, 2016

Algebra
42
September 15, 2016

Maths
sinA/(1-cosA) = cot(A/2) that should help. you are correct on the 2nd term.
September 15, 2016

math
the ratios are 3:1:2
September 15, 2016

math
5*1.5*1000/150
September 15, 2016

Math
since distance = speed * time, 120t = 105(t + 1/3) solve for t, then find the distance
September 15, 2016

Maths
on any two consecutive days, 1/15 + 1/20 = 7/60 of the job is done So, after 8 pairs (16) days, 56/60 = 14/15 of the job is done A finishes the job on day 17.
September 15, 2016

Algebra
the slopes of the line segments are: AB: 1/3 AC: 2 BC: -3 So, AB and BC are perpendicular You could also calculate the lengths of the sides, and see whether a^2+b^2 = c^2 for one of the pairs of sides. Too much work
September 15, 2016

mathematics
#1: x^2 + 9^2 = 9.6^2 #2: the triangle is isosceles.
September 15, 2016

College Algebra
for every $1 price increase, sales decrease by 150. So, Now you can use the point-slope form of the line: x-375 = -150(p-2.50) x = 750 - 150p
September 15, 2016

math
2y + 2xy' - 2yy' = 0 y'(2x-2y) = -2y y' = y/(y-x) y" = (y'(y-x) - y(y'-1))/(y-x)^2 = (-xy'+y)/(y-x)^2 = (-x(y/(y-x)+y)/(y-x)^2 = ((-xy+y(y-x))/(y-x)^3 = (y^2-2xy)/(y-x)^3
September 15, 2016

maths need help
no easy algebraic way to do it. You'll have to use a graphical or numeric technique (bisection, Newton's method, etc.) But, you know that 2^2 = 4 3^3 = 27 so, 2 < x < 3 2.6^2.6 = 11.99 2.7^2.7 = 14.61 so, 2.6 < x < 2.7 you can do this to get as close as you...
September 15, 2016

2.1 algebra
posted the same silly problem twice, each time with more typing errors. As it (sort of) says, "There are 27 campers."
September 15, 2016

2.1 algebra
uh, 27
September 15, 2016

Math
well, if 1/3 of x is 21 surely all of x will be greater than 21
September 15, 2016

math - incomplete
42
September 15, 2016

math
zero, if the 3rd corner is at (54,28) or any other point on the same line. Now, if you want to exclude the degenerate case above, you want to find the minimum distance between the line segment and another point with integer coordinates. Again, there is no minimum area, since ...
September 14, 2016

algebra 2
D = |1 -1 3| |-2 2 -6| = 0 |3 5 2| so, no solution exists Note that dividing #2 by -2, x-y+3z=19 -2x+2y-6z=9 can be written as x-y+3z=19 x-y+3z= -9/2 Those two lines are parallel, so they cannot intersect in a solution.
September 14, 2016

math
looks good to me. Another way to interpret the data is 0.2 of his salary,sh 32,800 per month meaning the salary is 32,800 Then you have to take 20% of that for fees and for savings
September 14, 2016

MAth
the equation describes a function, yes. if you want to write y as a function of x, then you have to rearrange things a bit: y = (5-3x)/8
September 14, 2016

Algebra
that should be "of -1" not "or"
September 14, 2016

Calculus
if f(x+2) = x^3+1, then replace x with x-2 and you have f(x-2+2) = f(x) = (x-2)^3 + 1 f^-1(x) = ∛(x-1) + 2 now just take the derivative of the inverse in the normal way.
September 14, 2016

Math
2(4x+5x)=70 find x, then you can get the dimensions, since 4x:5x = 4:5
September 14, 2016

Math
(6b^2)^2 = 6^2 (b^2)^2 = 36b^4
September 14, 2016

Calc
what are you trying to do? f(x) is defined piecewise. working with your equation, recalling that cos(5π) = cos(π) = -1 13 - 5π = k cos 5π 13 - 5π = k(-1) k = 5π-13 You cannot mix and match function arguments with other terms.
September 14, 2016

Math
8² +9(12÷3 x 2)-7 64 +9(4 x 2)-7 I think you get the picture, eh?
September 14, 2016

English
anonymous 3 years ago Which of the following about american romanticism is not true. a. romanticism originated in british literature and migrated to american literature. b. Romanticism valued imagination and emotion over reason and intellect. c. love is the primary theme in ...
September 14, 2016

Math
m/j = 5/7 j = m+18 (m+9)/(j-9) = (m+9)/(m+18 - 9) = ...
September 14, 2016

Math
I've done two of these. See what you can do with this one.
September 14, 2016

Math
that just means $0.20 per gram
September 14, 2016

Math
a/b = 2/5 (3/4 a)/b = (3/4)(a/b) = (3/4)(2/5) = 3/10
September 14, 2016

Math
a/b = 7/4 so, b = 4a/7 (a/2)/(4a/7 + a/2) = (a/2) / (15a/14) = 7/15
September 14, 2016

Physics
just solve for t in 3.18 + 2.1t - 4.9t^2 = 0 Pretty clumsy balloonist. Can't hold onto his compass for much over a second!
September 14, 2016

Pre-Calculus 11
Actually, the problem is misstated. You need k to be an integer. Otherwise, pick any positive rational number for x, and you have a different value for k. 1/3 + 2/3 = 1 3 + 3/2 = 11/2 = k 3/17 + 14/17 = 1 17/3 + 17/14 = k But those k values are not integers.
September 14, 2016

Pre-Calculus 11
so, did you follow the hint? 1/x + 1/(1-x) = k kx(1-x) - 1 = 0 kx^2 - kx + 1 = 0 Now, you know the roots are (k±√(k^2-4k))/2 For the roots to be rational, you must have k^2-4k a perfect square. See what you can do with that.
September 14, 2016

Physics
oops: 11.0 - 9.8t
September 14, 2016

Physics
solve for t in 26.5 + 11.0t - 4.9t^2 = 0 Then use that value for t in v = 11.0 - 9.8
September 14, 2016

English
Thank you
September 14, 2016

English
Is an autobiography considered to be a primary source?
September 14, 2016

math help azap
see other posting, "bella"
September 14, 2016

Math
I have no clue what the original statement was, but your choice is true.
September 14, 2016

Geometry - woefully incomplete
using technology? what does that mean? Usually constructions involve only a straightedge and compass. what "original circle"? Usually an inscribed circle is inside some polygon. You have provided no information on the various points you allude to.
September 14, 2016

algerbra help plzzz
That 1/3 (-5x) is incompatible with any of the choices. I suspect you have made a typo. Try entering in your expression at wolframalpha.com It will give you alternate versions, and it will show how it interpreted your input. Use enough parentheses that it agrees with your ...
September 14, 2016

math
1cm/1m = x cm / 40000m I suspect you meant 1cm = 1km
September 14, 2016

science
well, how is pH calculated?
September 14, 2016

maths
j/m = 7/4 m+10 = j-5 Now just solve for j
September 14, 2016

Science
depends on how much solution you want. For 1L, you will need 0.6 moles of NaHCO3. So, figure the wol wt (grams) and take .6 times that
September 14, 2016

ِAlgebra
since the lengths are 3:8, perimeter, also a length, is 3:8 area = length*length = 3^2:8^2 = 9:64
September 14, 2016

math
I suspect a "4" is involved somewhere here.
September 14, 2016

Algebra
y = kx so, y/x = k, a constant. So, you want y such that y/74 = -252/84
September 14, 2016

math
2x1/2 = 1/1
September 14, 2016

geometry
since vertical angles are equal, 3x = 5x-80
September 14, 2016

math
first term: a 2nd term a+d and ar so, a+d = ar r = 1 + d/a So, pick an a&d, say 1&2. AP: 1,3,5,7,9... GP: 1,3,9,27,81,... or, 10&5: AP: 1,11,21,31,... GP: 1,11,121,1331,... If no other information is given, that's about as far as we can go.
September 14, 2016

math
or, since the length is 18, 18 * (10/10)π
September 14, 2016

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>