Monday
September 26, 2016

Posts by Steve

Total # Posts: 44,051

physics
s = 1/2 at^2, so 1/2 a * 4.54^2 = 8.1 Now use that to figure how far it goes in the next second. v = a*t s = v*1 + 1/2 a * 1^2
September 1, 2016

science help pls pls
google planetary orbit period You will find lots of explanations, with the formula. I cannot believe that this question was asked of you without providing the formula, either in class or in the text. I also cannot believe that you expect someone to provide it for you.
September 1, 2016

science help pls pls
Just plug these numbers into your formula for orbital periods and subtract.
September 1, 2016

math
first place in standard form: x^2/8 + y^2/3 = 1 Since a^2 = 8 is greater than b^2 = 3, the major axis is horizontal. So, we have a^2 = 8 b^2 = 3 c^2 = a^2-b^2 = 5 Now just read off the info you want: center: (0,0) foci: (±c,0) vertices: (±a,0)
September 1, 2016

Math
consider 8^12 = 8*8*8...*8 12 times 8*9 = 8*8*8...*8 9 times nine of those factors cancel out, leaving 3 in the top, or 8^3 This is why x^m / x^n = x^(m-n) since n of the factors cancel out when reducing the fraction.
September 1, 2016

Discrete Math Proof Exercise
first, you need to show that only even+odd = odd even+even = 2m+2n = 2(m+n) = even odd+odd = 2m+1 + 2n+1 = 2m+2n+2 = even even+odd = 2m + 2n+1 = 2(m+n)+1 is odd so, if 3n^2+5 is odd, 3n^2 is even Since 3 is odd, n^2 must be even, which means that n is even, since odd*odd = (2m...
September 1, 2016

Calculus
Let M = ∫ e^(2x) cos3x dx u = cos3x du = -3sin3x dx dv = e^(2x) dx v = 1/2 e^(2x) M = uv - ∫v du M = 1/2 e^(2x) cos3x + (3/2)∫e^(2x) sin3x dx Now consider ∫e^(2x) sin3x dx u = sin3x du = 3cos3x dx dv = e^(2x) dx v = 1/2 e^(2x) ∫e^(2x) sin3x dx = 1...
September 1, 2016

MATH
3/5 * 3/4 = 9/20 so, if the full amount is x, then 9/20 x = 360 x = 360 * 20/9 5/8 of x is thus (5/8)(360)(20/9) = ?
September 1, 2016

Math
slope = 4, so the point-slope form of a line is y+1 = 4(x+5) massage that into whichever other form you desire
September 1, 2016

Mathematics
since the distance is the same, rate*time is constant. So, you want m minutes where 36m = 15*60
September 1, 2016

algebra,geography
see related questions below.
September 1, 2016

Math asap
and you are wrong. -3 < 2
September 1, 2016

Math asap
see related questions below. I know I've seen this answered at least once for you.
September 1, 2016

Math
still 3, right?
September 1, 2016

Math
15500
September 1, 2016

Geometry
no idea what you are saying: M 6 + 16 + z -1 and 14 ???!?!?!?
September 1, 2016

Geometry
wow, use language much? As I strain mightily to make sense of what you wrote, I get The midpoint of UV is (5,-11), and the coordinates of U are (3,5). well, since the midpoint M is halfway from U to V, and that distance is (2,-16), add those values to M to get all the way from...
September 1, 2016

Math
It takes 3 points to form a triangle, so there are 6C3 ways to choose them.
September 1, 2016

Geometry - mangled
fix the typos and repost, ok? It's basically gibberish as it stands.
September 1, 2016

MATH
nope. -3 < 2
September 1, 2016

MATH
what is 98?
September 1, 2016

Physics
convert each vector to x-y values add the x and the y values convert back to directional form
September 1, 2016

math
45km/hr * 1hr/60min * 1rev/(1.5π m) * 1000m/km = 159rev/min
September 1, 2016

Math
c(x) = 2*5x + 2*4x = 18x
September 1, 2016

Math
30 trips * 2*15 mi/trip * 1gal/28mi * $4/gal = $128.57
September 1, 2016

Technology
correct
September 1, 2016

College Algebra - incomplete
sorry - one equation in three variables has no unique solution by any method.
September 1, 2016

Math
consider how much of the job gets done in one hour. Mary does 1/2 Gina does 1/3 So, ever hour, 1/2 + 1/3 = 5/6 of the job gets done. If 5/6 gets done in one hour, the whole job takes 6/5 hours. 1/2 + 1/3 = 1/x For further discussions, I refer you to (a) your class text (b) ...
September 1, 2016

physics
If you have two vectors u and v, resultant is w = u+v equilibrant is w such that u+v+w = 0. That is, w = -(u+v)
September 1, 2016

Maths
let's call the roots a and b, just for ease of typing. f(x) = x^2-6x+k recall the sum and product of the roots: a+b = 6 ab = k Now, we have a^2 + b^2 = 40 but, a^2 + b^2 = (a+b)^2 - 2ab So, 36 - 2k = 40
September 1, 2016

Math question for Steve
yes. just figure the calls each day and keep adding them up. The table looked pretty clear to me. When the total exceeds 300, that's the day the 300th call was received.
September 1, 2016

Math
the slopes must be the same, so (8-1)/(-2-a) = (1-5)/(a+2-12) -7/(a+2) = -4/(a-10) 7(a-10) = 4(a+2) 7a-70 = 4a+8 3a = 78 a = 26
September 1, 2016

Math problem soving
Huh? Surely you can see that on day 6 the 300th call came in.
August 31, 2016

Differentiation
Rats. How about y x^(y-1) y' + lnx x^y + x y^(x-1) y' + lny y^x = 0 (y x^(y-1) + x y^(x-1))y' = -lnx x^y - lny y^x Note that x^(y-1) = x^y/x, so (y/x x^y + x/y y^x)y' = -lnx x^y - lny y^x ...
August 31, 2016

Differentiation
To differentiate u^v, where u and v are functions of x, use a combination of the easy formulas you already know: y = u^n y' = n u^(n-1) u' y = a^v y' = lna a^v v' x^y + y^x = 1 x^(y-1) y' + lnx x^y + y^(x-1) y' + lny y^x = 0 (x^(y-1) + y^(x-1))y'...
August 31, 2016

Math
The receiver is 10 yd downfield and 53 1/3 - 25 - 5 = 23 1/3 yds to the right. So, the distance is clearly √(10^2 + (70/3)^2) yds QB: (25,25) Rcvr: (35,48 1/3) So, take their averages to find the midpoint.
August 31, 2016

Precalculus
V(t) = 2600 - 145(t-13)
August 31, 2016

9th grade algebra
don't be scared by that x. It's juts a denominator. To get rid of it, multiply both sides by x. Now, to find x when h = -2, just do what you did: 12/x = -2 now just multiply by x: 12 = -2x x = -6
August 31, 2016

Math
x + 2(x+2) = x+4 + 20 Now just solve for x, the smallest
August 31, 2016

Math
(d/7) weeks, so (d/7)/4 = d/28 months
August 31, 2016

math
how do you drop by -5.7° Maybe you mean either it dropped by 5.7° or, it changed by -5.7° In that case, after 3.5 hours, the change is clearly -5.7 * 3.5° So, add that to the starting 23°, and what do you get?
August 31, 2016

Math
Or, it occurs to me that maybe you have garbled the question, and it should read $75 per month plus $0.30 per minute after the first thousand minutes In that case, it's just y = 75.00 for 0 <= x <= 1000 y = 75.00 + 0.30(x-1000) for x > 1000
August 31, 2016

Math
there is a flat fee of 75.00, so start with that: y = 75.00 Now, add .30 for each minute. For x minutes, that is .30x, so y = 75.00 + 0.30x No information is given on what happens after the first 1000 minutes, so all we can do is restrict the domain to what we know: y = 75.00...
August 31, 2016

Pre-Calulus
15000/15 - 15000/18 = 166.67 or, since the old car used 1000 gallons, the new car, with 20% (6/5) better mileage uses 5/6 as much gas, saving 1/6 of 1000 = 166.67 gallons.
August 31, 2016

Algebra
yes, just as with normal fractions 2/3 + 4/7 has an lcd of 4*7 3/4 + 1/6 has an lcd of 12 instead of 24, since 2 is a common factor of both 4 and 6. LCD(m,n) = mn/GCF(mn)
August 31, 2016

Algebra
x^2-9 = (x+3)(x-3) so that is the lcd 1/(x-3) + 1/(x+3) = 10/(x^2-9) multiply through by x^2-9 and you have (x+3) + (x-3) = 10 2x = 10 x = 5 For #2 if you mean 5/(2x) - 5/(3(x+5)) = (5/x) the lcd is 2x(3(x+5)) so 5(3(x+5) - 5(2x) = 5(2)(3(x+5)) 15x+75 - 10x = 30x+150 If I got ...
August 31, 2016

algebra
f^-1(9/x) = 9/x since f^-1(f(x)) = 9/(f(x)) = 9/(9/x) = x swap variables and solve for y: x = (2y+1)/(3-2y) x(3-2y) = 2y+1 3x-2xy = 2y+1 3x-1 = 2xy+2y 3x-1 = y(2x+2) y = (3x-1)/(2x+2)
August 31, 2016

Algebra
you only need an lcd if you are adding fractions with unlike denominators. Multiplication and division just work on the tops and bottoms separately.
August 31, 2016

Algebra
(5/8)/(-2/3) = (5/8)(-3/2) = -15/16 (x^-1+y^-1)/(x+y) = (1/x + 1/y)/(x+y) = ((x+y)/(xy))/(x+y) = 1/(xy)
August 31, 2016

algebra
s/3600
August 31, 2016

Math
The bill for x + 1/4 miles is .75 + .35x <= 7.40
August 31, 2016

Math
105 cannot be their least common factor, as it has its own smaller factors. Though I think the question has been garbled, since I cannot understand "two pairs of numbers of 105"
August 31, 2016

biology
surely you know what "complex" means and also the molecular level, as opposed to the more large-scale aspects. You know about molecules, right? So, given those ideas, and a little thought (and maybe some help from google) what do you think?
August 31, 2016

linear algebra - can't grok
your economy of typing (laziness?) makes your posting almost unintelligible. We don't mind helping you find the answers, but don't ask us to figure out the questions as well, ok? and what the heck is a signal lac?
August 31, 2016

math
24 students makes 12 pairs. There are 3 pairs to go. So, how many magnets is that?
August 31, 2016

Math
.30x = 90
August 31, 2016

geometry
how are the angles arranged? That is, what is the order of D,F,G,H around point E? Are there any right angles or straight angles in the picture?
August 31, 2016

math
yes
August 31, 2016

Math
7x1=7 7x2=14
August 31, 2016

Biology
Explain the following statement: "life is complex on a molecular level. How is your environment different from the biosphere?
August 31, 2016

Math
multiply all the powers by 4. 2^4 = 16
August 31, 2016

Math
two points cannot intersect B is also false, since the sign of the y-values are not both positive. This whole question appears bogus.
August 31, 2016

Math
If they lost x, then x + 2x+15 = 78
August 31, 2016

Math
(8/5) * 40
August 31, 2016

Algebra 1
5 more than x: x+5 5 more than (half Karen's salary): (k/2)+5 Your answer is half of (5 more than Karen's salary).
August 31, 2016

Algebra 1
correct
August 31, 2016

Algebra help
I like D!
August 31, 2016

Algebra help
oh, and speed is not measured in feet. Distance is measured in feet. Speed is measured in feet per second miles per hour or something else like that
August 31, 2016

Algebra help
I think so. speed depends on time and distance. None of the answers really is complete, but they all say something depends on something else. For a given distance, speed depends on the time it takes to travel that distance. So, if you want to determine Andy's speed, ...
August 31, 2016

Algebra help
speed = distance/time
August 31, 2016

Math
Draw a number line. You will see that -5 is to the right of -8. So, -5 > -8 and yes, -6 < |-8| = 8
August 31, 2016

Mathematics
yep
August 31, 2016

Math
Draw any convex polygon of n sides. From any vertex, there are n-1 other vertices to reach. But two of those are adjacent, so a joining line is just a side. That leaves n-3 other vertices. Joining to them will form diagonals.
August 31, 2016

math work
as long as we're using determinants, u•v×w = |9 -7 -3| |-6 1 -5| |2 8 -9|
August 31, 2016

math work
see related questions below
August 31, 2016

Math
maybe it's 7/12, since 1/3 + 1/4 = 7/12
August 31, 2016

Science
v^2 = 2as, so 25 = 10a a = 2.5 m/s^2 F = ma = 1.25N
August 31, 2016

math
9 1/4 - 15 2/6 = -(15 4/12 - 9 3/12) = -6 1/12
August 31, 2016

math
5 4/12 - 3/12 = 5 1/12
August 31, 2016

math
well, the chance that both are girls is 8/14 * 7/13
August 31, 2016

Math
rice: 11/18 tomatoes: 3/7 * 7/18 = 1/6 spinach: 1/4 * 2/9 = 1/18 1 - 11/18 - 3/18 - 1/18 = 3/18 so, 1/6 of the field is yams
August 31, 2016

math
88/2 = 44 44/2 = 22 22/2 = 11 2^3 * 11 = 88
August 31, 2016

Math
.20 * .65 * 25 = ?
August 31, 2016

Pre-calculus
see related questions below
August 31, 2016

math
why the decimals? We're practicing mixed numbers here 7 1/2 - 5 3/4 = 6 6/4 - 5 3/4 = 1 3/4
August 31, 2016

math
Take a look at the following article, and see what you can come up with: https://betterexplained.com/articles/navigate-a-grid-using-combinations-and-permutations/
August 31, 2016

Geometry
x^2+y^2+3x-8y+16=0 is the circle (x + 3/2)^2 + (y-4)^2 = 9/4 So, the center of the circle is at (-3/2,4) The distance to the line 4x+3y-12=0 is thus |4(-3/2) + 3(4) - 12|/√(4^2+3^2) = 6/5 So, the desired circle is (x + 3/2)^2 + (y-4)^2 = 36/25
August 31, 2016

Geometry
find the distance from the center of the circle to the line. Use that for the radius of the circle.
August 31, 2016

maths
9/12 = 75%
August 31, 2016

maths
Simon's distance: 6x Jade's distance: 11y 11*6 + 6x = 114
August 31, 2016

algebra
Start with the url below and fix your typos till you get one of your choices: http://www.wolframalpha.com/input/?i=solve+1%2F3x+%2B+3%2F4+y+-+2%2F3+z+%3D+-8,+x+%2B+1%2F2+y+-+1%2F3z+%3D+18,+1%2F6+x+-+1%2F8+y+-+z+%3D+-24
August 31, 2016

math
add the two equations and y drops out: 2x^2-22x = -48 x^2-11x+24 = 0 (x-3)(x-8) = 0 Now just find the y for each x.
August 31, 2016

math
If all you can do is multiply and divide, I don't see how it can be done. 5 and 7 are primes, and there is no way to cancel them as factors
August 31, 2016

physic
speed (m/s) = wavelength (m) * frequency (1/s) v = λf so, for a given frequency, the velocity is directly proportional to the wavelength. Get v in air, and then you can figure v in glass.
August 31, 2016

physics
T = kML
August 31, 2016

math
(a+b+c)^3 = a^3 + 3a^2b + 3a^2c + 3ab^2 + 6abc + 3ac^2 + b^3 + 3b^2c + 3bc^2 + c^3 so, (x^2+x+1)^3 expands as x^6 + 3x^5 + 3x^4 + 3x^4 + 6x^3 + 3x^2 + x^3 + 3x^2 + 3x + 1 which is what was above
August 31, 2016

Algebra
the first train is 40 miles ahead when the 2nd train starts. The 2nd train is going 10 mi/hr faster, so how long do you think it will take to cover the extra 40 miles?
August 31, 2016

Math
16/(26+19+21+26+32)
August 31, 2016

Algebra
google is your friend.
August 31, 2016

Algebra 2
all polynomials have a domain of all real numbers. Any straight line which is not a simple y = k horizontal line also has a range of all real numbers. To see this, just draw any line. It extends forever both left and right, and up and down. (unless ut is horizontal)
August 31, 2016

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