Thursday

September 29, 2016
Total # Posts: 44,241

**Math**

(30-2w)(20-2w) = 375

*August 28, 2016*

**Math**

v = π/4 d^2 h now use your numbers

*August 28, 2016*

**Math or Maths???**

prolly from mathematics -- "maths" retains the "s"

*August 28, 2016*

**maths**

Oops. I worked an A.P., not G.P. a = ar + 4 ar + ar^2 = "2 by 2/3" Now just solve for a and r and then list the first 4 terms.

*August 28, 2016*

**maths**

a = (a+d)+4 (a+d)+(a+2d) = "2 by 2/3" (whatever that means) Anyway, now just solve for a and d, and then list the first 4 terms.

*August 28, 2016*

**Math Need Help**

Just do a long division first: ((2x+4)(2x-1))/(3x-2) = 4x/3 + 26/9 + 16/9 * 1/(3x-2) so, ∫((2x+4)(2x-1))/(3x-2) dx = 2x^2/3 + 26/9 x + 16/27 log(3x-2) + C

*August 28, 2016*

**Maths**

If the 3rd side is x, then we must have 8-6 < x < 8+6

*August 28, 2016*

**math**

google is your friend. See http://www.mathopenref.com/coordtrianglearea.html

*August 28, 2016*

**percentage**

20% of (12000-2000) = 2000 30% of the remaining 10000 is 3000 so now you can see how much she saves monthly, and thus can figure the annual savings.

*August 28, 2016*

**Calculus**

Your typo does not help, but the problem is discussed here: http://math.stackexchange.com/questions/217026/show-that-f-has-at-most-one-fixed-point remember that google is your friend.

*August 28, 2016*

**Math College 115**

(7.5-6.5)/(2009-2004)

*August 28, 2016*

**math**

when you said quadrilateral, that means four sides.

*August 28, 2016*

**maths**

The two angles form a straight line, so how many degrees is that in total?

*August 28, 2016*

**Math**

well, let XY=2 and YZ=5 XY/XZ = 2/7

*August 27, 2016*

**College Math**

(4*50)/350 = 4/7 = 57%

*August 27, 2016*

**Math**

use either point in your equation: -3/13(-10)+b = 3 30 + 13b = 39 13b = 9 -3/13(-2)+b = -5 6+13b = -65 13b = -71 Hmmm. They should come out the same. Let's check your slope: m = (-5-3)/(-2+10) = -1 So, y = x+b -(-10)+b = 3 10+b = 3 b = -7 -(-2)+b = -5 2+b = -5 b = -7 So, ...

*August 27, 2016*

**Algebra 1**

how vewwy vewwy wude!

*August 27, 2016*

**Math**

differences: -1/3, 1, -3 ratios: 0, ∞, -2 since neither is constant, it is neither an A.P. or a G.P. So, how to figure the next terms? Note that the differences form a G.P., with the next terms 9,-27,81 Adding those to -2, we get 7,-20,61, or choice (A)

*August 27, 2016*

**Maths**

If you take the time to list the possible events qnd the contents of the jqr qfter eqch, the qnswer will become cleqr. qnnoying, isn't it?

*August 27, 2016*

**Maths**

2/3 * 2/3

*August 27, 2016*

**real analysis**

google is your friend http://math.stackexchange.com/questions/283987/interior-closure-and-boundary-of-the-sets-of-all-rational-and-irrational-number

*August 27, 2016*

**Higher Math**

tan10x = 2tan5x/(1-tan^2(5x)) so, 2tan(5x)/(1-tan^2(5x)) = 1/tan(5x) 2tan^2(5x) = 1-tan^2(5x) 3tan^2(5x) = 1 tan 5x = ±1/√3 Now use that to get your reference angles and produce as many solutions as your domain requires.

*August 27, 2016*

**Math**

height: h width: h+4 length: w+8 = h+12 h(h+4)(h+12) = 512 all the factors of 512 are powers of 2, so we have 2^9 = 512 2+3+4 = 9 2^2 * 2^3 * 2^4 = 512 4*8*16 = 512

*August 27, 2016*

**math**

when n=1, A1 = -7*1+8 = -7+8 = 1 now just start subtracting 7 again and again.

*August 27, 2016*

**math**

since you keep multiplying by -1, there will be (n-1) of them by the nth term.

*August 27, 2016*

**math**

Check the ratio between terms. If it constant, choose it. For example, -6/2 = ?

*August 27, 2016*

**math**

F is the first term None of the choices identifies the first four terms

*August 27, 2016*

**maths**

9999999 - x = 6543210

*August 27, 2016*

**Math**

heads: s+a=10 legs: 8s+6a=68 Now just solve for s and a.

*August 27, 2016*

**math just for fun**

111*16 = 1776 pages Looks like 4 reams will do the job. So, how much will that cost? If only paying for the paper used, that would end up as 1776/500 * 3.88

*August 27, 2016*

**math**

.70p = 35

*August 27, 2016*

**Math**

Also, note that you have not said which numeric grade is equivalent to a B. Nor have you said how many items remain to be graded. If you can't specify the requirements, how can you expect a solution?

*August 26, 2016*

**Math**

512 = 8^3 = 2^9

*August 26, 2016*

**math**

it has an inverse, since f^-1(x) = ∛(x-8) + 2 Also, you know that g(x) = x^3 is 1-to-1, and f(x) is just g(x) shifted by (2,8). More formally f(x) is one-to-one if f(a) = f(b) means that a = b so, let's say that f(a) = f(b) That means that f(a) = f(b) (a-2)^3+8 = (b-...

*August 26, 2016*

**Physics**

you forgot the depth: 1cm Though it makes the units come out, it does not affect the final numerical value. Looks good.

*August 26, 2016*

**12th grade physics**

1000 cosθ where sinθ = 15/40

*August 26, 2016*

**algebra**

what do you mean by reasonable? Is 23.62 less reasonable than 23 ?

*August 26, 2016*

**maths**

minimum cost is at the vertex of the parabola. As usual, that occurs at x = -b/2a = 10/0.5

*August 26, 2016*

**geometry**

clearly AB has been rotated 1/4 turn to the left. Since the triangle is still the same size (AB has the same length as A'B'), we just need to find the translation. (-3,4) --> (-2,-3) so it has been moved by (1,-7) Now just convert those two changes to your standard ...

*August 26, 2016*

**geometry**

With no figures to consult, it's very hard to say ...

*August 26, 2016*

**Math**

seven digit number xxxxxxx digit 3 in my ten thousands and tens places xx3xx3x carry on from here

*August 26, 2016*

**calculus**

see whether you can come up with the answer shown at http://www.wolframalpha.com/input/?i=inverse+%7B%7B16,1%7D,%7B1,16%7D%7D

*August 26, 2016*

**calculus**

Review the definition of matrix multiplication. See if you can come up with the answer shown at http://www.wolframalpha.com/input/?i=%7B%7B3,8%7D,%7B6,3%7D%7D*%7B%7B4,5%7D,%7B4,4%7D%7D

*August 26, 2016*

**algbra**

I believe √100 = 10, not 5 anything that is only concerned with integers and fractions is rational. √19 is irrational nope pi is irrational the √ values are irrational only (a) is rational I think you have some reviewing to do...

*August 26, 2016*

**calculus**

eh? just subtract corresponding elements: [1 5 2] ...

*August 26, 2016*

**Math**

1.08x <= 18

*August 26, 2016*

**algebra 1**

both correct. Although, I don't think Best Buy sells cereal...

*August 26, 2016*

**Maths**

As always, draw a diagram and review your basic trig functions. If B is at height h above A, then h/600 = sin11° Now, if the distance CA is x, x = 600cos11° + h cot23°

*August 26, 2016*

**maths**

since 3/4 of each, that means 3/4 of their total. (3/4)t + (3/4)c = (3/4)(t+c)

*August 26, 2016*

**Math**

recall that for odd powers, a^n + b^n = (a+b)(a^(n-1) - a^(n-2)*b + ...) since 4+6=10, the product is a multiple of 10, so dividing by 5 leaves a remainder of zero. (D)

*August 26, 2016*

**physics**

solve 35t - 4.9t^2 = 0

*August 26, 2016*

**Lost**

3000c - 900 = 3750 3000c = 4650 c = 4650/3000 or, more directly c = (p+e)/n

*August 26, 2016*

**Math**

if n is any value except zero, n/n = 1

*August 26, 2016*

**Math**

list the pairs of factors of 60 and 75 The more factors, the more ways they can be arranged.

*August 26, 2016*

**Analogy**

eighteen:even::thirty-three:odd

*August 26, 2016*

**Chemistry**

convert to moles, then multiply by Avogadro's Number

*August 25, 2016*

**Math**

see related questions below

*August 25, 2016*

**Physics I - Modern**

it's mv/√(1 - v^2/c^2) see http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relmom.html

*August 25, 2016*

**Math**

well, a 150lb person on the moon would weigh (150/120) * 20 = 25lb

*August 25, 2016*

**Math**

no idea. try google

*August 25, 2016*

**physics**

40 mi/hr * 1609m/mi * 1hr/3600s * 60s/min * 3min = 1073.7 m

*August 25, 2016*

**7th grade math**

clearly, two of the three possible discounts will give enough discount so that the final price with tax will be less than $25. So, probability is 2/3

*August 25, 2016*

**7th grade math**

There are 8 possible outfits with the shoes and bottoms. So, what is the smallest multiple of 8 that is at least 35? Using n tops, he gets 8n outfits.

*August 25, 2016*

**Pre-calculus**

Since the axis is horizontal, the general equation is x = a(y-k)^2 + h Since the vertex is at y=k, k = h and that means x = a(y-k)^2 + k Using the two points, we have a(-2-k)^2 + k = 6 a(4-k)^2 + k = 3 solve those, and you wind up with x = 1/4 (y-2)^2 + 2 x = 5/36 (y-14/5) + ...

*August 25, 2016*

**math**

1/4 + 5/8 + x + 3/4 = 2 1/2 Now just solve for x did you get 7/8 ?

*August 25, 2016*

**Math**

since distance = speed * time, if your speed is x, then 2*x + 2*2x = 258

*August 25, 2016*

**physics**

The ball's height is modeled by h(t) = 15t - 4.9t^2 The ball will be 8m high twice: on the way up and on the way down. These times can be found by solving 15t - 4.9t^2 = 8 See http://www.wolframalpha.com/input/?i=15t+-+4.9t%5E2+%3D+8 If you include the units in your ...

*August 25, 2016*

**MATH**

(36-30)/30 * 100

*August 25, 2016*

**Maths**

there are 48*16 food portions after 4 days, 48*4 portions have been eaten. So, there is enough for (48*16 - 48*4)/(48-12) = 16 days or, after 4 days, 1/4 of the food is eaten. That leaves enough for 12 days for the full population. But, the population is now 3/4 what it was, ...

*August 25, 2016*

**value**

m/d = 8/5 d = 15, so m=24 so, what is m-6?

*August 25, 2016*

**Maths**

start with cot(x/2) = sinx/(1+cosx) and see where you can take that.

*August 25, 2016*

**maths**

just list the factors of 72, and work with that, depending on how many piles you want: 1 72 2 36 2 2 18 2 2 2 9 ... 3 3 8 3 24 and so on

*August 25, 2016*

**alg. Connections**

total points for an 85 average: 85*3 = 255 Points so far: 81+86 = 167 So, haw many does she still need?

*August 25, 2016*

**algebra HELP MRS SUE**

B is better :-)

*August 25, 2016*

**lauren**

If $x at 11%, then the rest $(6300-x) is at 7%. So, just add up the interest: .11x + .07(6300-x) = 565

*August 25, 2016*

**value**

And surely the ratio is 4:3, not 40:3 maybe for bread 40:3 would be appropriate, as it is not so sweet as a cake.

*August 25, 2016*

**Geometry**

You may be right, but I have no diagram, so it's hard to say; but they do add up to 180°, so they are also supplementary.

*August 25, 2016*

**maths**

visit https://www.learnnext.com/nganswers/ask-question/answer/OPQR-is-a-rhombus-three-of-its-vertices-lie-on-the-circle-/Areas-Related-to-Circles/18625.htm

*August 25, 2016*

**Science**

1.5 m/hr * 1hr/3600s = 1/2400 m/s now, recall that time = distance/speed and use that what are you, a slug? Maybe you meant 1.5 km/hr. If so, jack up the speed by a factor of 1000.

*August 25, 2016*

**math**

well, just add the fractions: 1/4 + 1/3 + 1/2 + 7/12 + 3/4 + 5/6 + 1 = 3/12 + 4/12 + 6/12 + 7/12 + 9/12 + 10/12 + 12/12 = (3+4+6+7+9+10+12)/12 = 51/12

*August 24, 2016*

**Math**

assuming straight-line depreciation, then it will have lost (10/4)(.25) = .625 = 5/8 of its value So, it will be worth 3/8 of 21000 or $7875

*August 24, 2016*

**Math - Composition of Functions**

huh? really? g(x) = 1/x so, f(x) = g◦h = 1/h = 1/(x+1)

*August 24, 2016*

**math**

1xxx1 or 1xxx7 now just fill in the other 3 digits in the 6 ways possible

*August 24, 2016*

**math**

Hmmm. I see it as $54(1/6) + (1/2)($18(1/6)) = $12

*August 24, 2016*

**Math**

x y

*August 24, 2016*

**Math**

why are you guessing? I hope you actually did some kind of calculation. since cos(kx) has period 2pi/k, cos(pi/3 x) has period 6 the rate of change is y' = -pi/3 sin(pi/3 x) so, it is zero at pi/3 x = 0 or pi or 2pi; that is, x = 0,3,6 sin(pi/3 x) is at a max when pi/3 x...

*August 24, 2016*

**physics vectors**

the final vector will have x- and y-components. The direction θ is such that tanθ = y/x

*August 24, 2016*

**physics vectors**

so, get out your graph paper, plot the vectors and measure the final vector.

*August 24, 2016*

**Math**

12(3+2)

*August 24, 2016*

**math**

if the three numbers are x-1, x, x+1 then you know that x+1 = (x-1)/2 + 2 or x+1 = (x-1+2)/2 depending on how you parse the words

*August 24, 2016*

**MATH - again?**

Damon already did this one for you.

*August 24, 2016*

**calculus**

x^2+4y^2+16z^2−64 = 0 16z^2 = 64-x^2-4y^2 2z ∂z/∂x = -2x 2z ∂z/dy = -8y so, ∂z/∂x = -x/z ∂z/∂y = -4y/z ∂^2z/∂x^2 = -(x^2+z^2)/z^3 and you can do the others similarly, using the quotient rule or the product rule

*August 24, 2016*

**math**

subtracting a smaller number results in a greater difference.

*August 24, 2016*

**Economics**

Assuming that all the variable cost is labor, that would make wages for (50-30)/2 = 15 units

*August 24, 2016*

**Math**

note that this is also just (x+y)/2 + (7+17)/2

*August 24, 2016*

**Math**

(x+y)/2 = 10 (x+7 + y+17)/2 = (x+y + 24)/2 = (x+y)/2 + 24/2 = 10+12 = 22

*August 24, 2016*

**Physics**

lnx x^y + lny y^x - ----------------------------------- x^(y-1) + y^(x-1)

*August 24, 2016*

**business**

total_grade=0fori=1to4readscore[i]totalgrade+=score[i]nextiaverage=total_score/4fori=1to4displayi,": ",score[i]nextidisplay"average: ",average

*August 24, 2016*

**math**

area is circumference times height, so 14πd = 396 assuming open ends.

*August 24, 2016*