Thursday
September 29, 2016

Posts by STEVE

Total # Posts: 44,207

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

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

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