Friday
December 9, 2016

Posts by Steve

Total # Posts: 47,028

Math
1 - 1/2 = 1/2 1/2 - (1/2)(1/3) = 1/3 1/3 - (1/3)(1/4) = 1/4 Or, using the common denominator of 12, 12-6=6 6-2=4 4-1=3 3/12 = 1/4
October 24, 2016

Math
since the parabola opens upward, the set will be all the real number line except the interval between the roots.
October 24, 2016

Math
BD divides AC in the ratio 5:13. You can use that and the law of cosines to find BD Or, knowing all the angles in ABD, use the law of sines.
October 24, 2016

Please Help Math
if you mean the complement of A, it's everything except what is in A.
October 24, 2016

Math
recall that cos(180-x) = -cos(x) and just pair up the angles. The result will be quite simple.
October 24, 2016

Math
get the angle θ between the sides using the law of cosines. area = 9.2*7.4 sinθ
October 24, 2016

math
recall the properties of the parabola y^2 = 4px Your parabola has been shifted so the vertex is at (2,-1) because 4y^2+3x=2+8y 4y^2+8y = -3x+2 4(y^2+2y+1) = -3x+2+4 4(y+1)^2 = -3x+6 = -3(x-2) (y+1)^2 = (-3/4)(x-2) Now just apply the properties of the standard parabola.
October 24, 2016

Math
We are happy to help with answers, but don't make us supply the questions as well!
October 24, 2016

Math
That's what I get.
October 24, 2016

Math
angle R = 180-58-38 = 84° Now you can use the fact that AB║PR to use corresponding angles and their supplements to find the other two angles of the trapezoid.
October 24, 2016

Math
they are in the ratio 3:4 as provided by the angle bisector theorem.
October 24, 2016

maths
Write down the sum and product of the roots of the following quadratic polynomials: (a) 3x^2 - 6x - 7 (b) 3x^2 + 6x + 7
October 24, 2016

Math
a sum
October 24, 2016

physics
vf = 11.5 m/s or 11.5 ms^-1 but not m/s^-1 = m/(1/s) = ms
October 24, 2016

maths
I assume you can apply the quadratic formula. 3x^2 + 20x - 7 The factors must be of the form (3x?1)(x?7) or (3x?7)(x?1) where the proper + or - sign must be used to get the +20x. Hint: 3*7 = 21 To solve by completing the square, proceed as in the examples in your text to get a...
October 24, 2016

maths
No I haven't
October 24, 2016

Algebra 1
all correct. Good job.
October 24, 2016

Math- Please check my answer
you are correct.
October 24, 2016

Math
use the law of cosines.
October 24, 2016

Maths
the line intersects where -x^2-x-8 = ax+1 x^2 + (a+1)x + 9 = 0 In order for there to be a single intersection, the discriminant must be zero. That is, (a+1)^2 - 36 = 0 See what you can do with that. http://www.wolframalpha.com/input/?i=plot+-x%5E2-x-8,+y%3D5x%2B1,+y%3D-7x%2B1...
October 24, 2016

Maths
the differences are 13,15,17, ...
October 24, 2016

Math
d^2 = 2s^2
October 24, 2016

algebra
a+4d = 2(a+d)+1 a+9d = 2(a+3d)+3 Now crank it out.
October 24, 2016

Algebra
These do not factor over the rationals. You need to complete the square of use the quadratic formula.
October 23, 2016

Geometry
to get the vertex angle θ, sin(θ/2) = 7/24 Once you have θ, the other two angles are equal, and they all three add up to 180.
October 23, 2016

maths
Multiples of 11 which end in 7 are 11*17 = 187 11*27 = 297 ... 11*87 = 957 So, how many are there?
October 23, 2016

Math
more frequent compounding, more money.
October 23, 2016

Math
this is not hard. Just start listing the sums: ABDM 1983: 918+318+813=2049 ... There are only 24 ways to arrange the numbers. Crank it out. I think you can eliminate all the ones where A is not 1. That makes one of the other leading letters be 1; not a likely choice.
October 23, 2016

Math
start listing the powers. You will see a pattern which makes it easy to solve this problem.
October 23, 2016

math
If he has 93 fruits, how do you come up with 6 bags of 8 fruits?
October 23, 2016

Maths
If she shoots x baskets, she scores 2x points, so she needs 94 + 2x = 16*12 and that's "in all" not "at all"
October 23, 2016

Math
review Euler's Formula for polyhedra.
October 23, 2016

math
?? The sides appear not to be integers. I guess there must be a border included in the length. √800 = 20√2 So, I guess there are 10√2 small squares across and down.
October 23, 2016

Math
Since it's going down, subtract another 40 feet: -28-40
October 23, 2016

Math limits
#1 is correct, but could be done directly. 3/x^2 -> 0 so, the limit is just 4x, which -> ∞ For #2, no tricks are involved. x^2 -> 0, so -(x^2-4)/(x^2-1) -> -(0-4)/(0-1) = -4
October 23, 2016

Algebra
(11+2w)(8+2w) = 154 You add 2w because both sides have a border. Note that 154 = 14*11
October 23, 2016

math
"increased 5 times" could mean x(+x) 5 times = 6x or x*5 = 5x I'll assume the latter, but you can fix it if you need to (5x+3)/2 = x - 0.3
October 23, 2016

Math
df/dx = 3, so df = 3 dx dx = -0.1, so ...
October 23, 2016

Math
just write what they gave you 99 ∑ 1/(k(k+1)) k=1
October 23, 2016

phy101
geez - same problem, no fixes made.
October 23, 2016

N.E.U
You want to specify all the data and try again? and that's m/s^2, not some bogus m.s.s which is meaningless.
October 23, 2016

value
why all those tedious words? It appears that you mean x+9 = 2 1/4 x On the other hand, you opaque language makes it unclear.
October 23, 2016

math
Sue is 2 mi/hr faster. So, how long to make up the 1/2 mile?
October 23, 2016

Physics
momentum (mv) is conserved. So, if v is the same, m is the same.
October 23, 2016

math calculus
If the height is y and the width is x, then a = (x+10)(300/x + 20) now find da/dx = 0 for minimum area.
October 23, 2016

maths
a common ratio indicates a g.p. (or, as nasra calls it, a go) S10 = a(r^10-1)/(r-1) a(2^10-1) = 93 a = 93/1023 and that's "the sum ... is 93"
October 23, 2016

mathematics
(2/3)x = (5/8)(31-x)
October 23, 2016

Math Homework
I assume you have some formula for seeding the teams?
October 23, 2016

math
what's the trouble? Just write down what they tell you: p = x + 4x+10 + x+3
October 23, 2016

math
∫ sin2x/√(1+cos^2x) dx u = 1+cos^2x du = -2cosx sinx ... ∫ x/[(x^2-1) ln(x^2-1)] dx u = ln(x^2-1) du = 1/(x^2-1) * 2x dx ...
October 23, 2016

Algebra
40 days and 40 nights. Now, to find Ali's number, solve 6x-30 = 78
October 23, 2016

Math
LCM(12,18) = ?
October 23, 2016

Mathematics
g^-1(x) = log3x
October 23, 2016

Mathematics
or, you know that one root is at (0,0) and since the vertex is at x=2, the other root must be at (4,0). So, y = ax(x-4) y(2) = -8, so -8 = a*2(-2) a = 2 y = 2x(x-4) This agrees with Reiny's solution above.
October 23, 2016

science
take a look here: http://physics.stackexchange.com/questions/99117/why-gravity-decreases-as-we-go-down-into-the-earth
October 23, 2016

Maths
In a square (or rhombus), the diagonals are perpendicular. Since your diagonals have a 45° angle between them, the two semi-diagonals form an isosceles triangle with vertex angle 45° and equal sides of length 3. I expect you can draw that, eh? The length is 5.544 and ...
October 23, 2016

math
what - you can't count from 20 to 30?
October 23, 2016

Physics
it will be 10/3^2 as much try proofreading what you type before finally posting, ok?
October 23, 2016

math (horizontal tangent line)
You are correct. The slope is always positive. see the graph at http://www.wolframalpha.com/input/?i=x%5E3%2Bx
October 22, 2016

Present Value Math
just plug your numbers into your PV formula. You do have the formula, right? If not look it up in your text or online.
October 22, 2016

Math (Calculus)
If you truly have no idea, you clearly have not studied your text. In this case, google is your friend. It will provide many discussions (wikipedia is a good one), as well as youtube videos. When you are really lost, and need general instruction, start with google. This site ...
October 22, 2016

Math
OR, P - 2 1/3 = -8/12 = -2/3 ...
October 22, 2016

Math
12(p) - 12(2 1/3) = -8 ...
October 22, 2016

Calculus
a = πr^2 da = 2πr dr The error is ∆a which for small errors is approximately da. So plug and chug. Now, what does it all mean?
October 22, 2016

Physic
If we let A=(0,0) then the rider ends up at C=(2.6,1.5) Now just use the law of cosines to get the distance, and note that the angle from B to C is tanθ = 1.5/2.6 But that is the bearing of C from B. You want the opposite direction to get from C to B.
October 22, 2016

integrals
you can't use the power rule because that says ∫ u^n du = 1/(n+1) u^(n+1) But if you let u = x^2+4 du = 2x dx So, you do not have ∫ u^-2 du because you would need a 2x on top. Instead you need to use a trig substitution. (Well, I guess you don't need to, ...
October 22, 2016

Math
What's the trouble? Just write down what they told you: b = 3.40*19 + (35.00+14.95)d
October 22, 2016

Math
A car rental agency charges ​$35 per day to rent a car and ​$14.95 per day for a global positioning system​ (GPS). Customers are charged for their full tank of gas at ​$3.40 per gallon. A car has a 19 gallon tank and a GPS. a) Write a function rule for ...
October 22, 2016

math
you just need to remember your point-slope form of a line, and you get y-5 = -6(x+12) Then just rearrange as needed.
October 22, 2016

Math
Note that the maximum area is achieved when the fencing is divided equally among the lengths and widths: 1200 each.
October 22, 2016

Science
... emotions: Exhilaration!!!
October 22, 2016

physics numerical
since mv is the same for both bodies, m1/m2 = v2/v1 15/2000 = v2/v1 Now if you can see your way to specifying v1, you can find v2.
October 22, 2016

Math
A car rental agency charges ​$35 per day to rent a car and ​$14.95 per day for a global positioning system​ (GPS). Customers are charged for their full tank of gas at ​$3.40 per gallon. A car has a 19 gallon tank and a GPS. a) Write a function rule for ...
October 22, 2016

math
http://www.jiskha.com/display.cgi?id=1477157306
October 22, 2016

math
this is just like the other one. The car dropped in value by $7500 in 5 years. That is $1500/year, so the slope of the line y = mx+b is -1500 That means y = -1500x + b Now you just have to find b so it fits the data.
October 22, 2016

Math
3700(1 + .07/2)^(2*12.5) = ?
October 22, 2016

Computer
good grammar and spelling!
October 22, 2016

Repost(Physics)
well, it clearly grows by 2 km/hr every hour. So, that means it grows by 1/1800 km/hr every second.
October 22, 2016

bctc
Think of the lines y=3x, y=5x See where that takes you.
October 22, 2016

calculus
There are lots of similar questions answered below in the related questions section. And unless it's a rain tank, you probably mean "radius."
October 22, 2016

Calculus
surely you can find the y-intercept!! Just set x=0 As for x- intercepts, note that y = x^2 √(3-x) √(3+x) now where does x^2 √(3-x) √(3+x) = 0 ??
October 22, 2016

Math, Functionsons
as I mentioned in your previous post, The domain of all polynomials is (-∞,∞) Now, note that x^2 >= 0 so, x^2-2 >= -2 The range is thus [-2,∞) Think of the graph. Its vertex is at (0,-2).
October 22, 2016

Describing Data
well, the average frequency for those years is (6605+712+88011+1790)/4 = 24,280 But, as you can see, any linear model will be a pretty poor predictor, since the values are so widely scattered. But, if you broke the data into groups of 5-10 years, things might even out some.
October 22, 2016

Math
|-4| = 4 |+4| = 4 ... and so on
October 22, 2016

algebra 1
y = 2 + (20-2)/6 x = 2+3x This comes about because in 6 lessons you have learned 18 words. That's 3 words/lesson, starting with 2.
October 22, 2016

math
get what? They told you that the value dropped from 20K to 14K in two years. If you can't see how that relates to the slope of the graph, then you seriously need to review your text or look at examples online. Since it dropped 3K in one year, and a year after it was bought...
October 22, 2016

math
it dropped 6K in 2 years. That's 3K per year. So, it started at 3K more than 20K. y = 23000 - 3000x
October 22, 2016

Algebra
5646000 * 1.047^n = 13000000000
October 22, 2016

Algebra
$15/hr
October 22, 2016

Algebra
do you not see the relation between hours and money?
October 22, 2016

Math, Functions
the domain of all polynomials is (-∞,∞) There is no value of x which is not allowed. Since the graph is a sloping straight line, it extends forever in both directions, so the range is also (-∞,∞)
October 22, 2016

Math - correction
nope. only 13 are boys. 22:13
October 22, 2016

Math
counting boxes, with x sold on Monday, x + x-3 = 15 12x is the number of pencils.
October 22, 2016

math
the lot will be 37.5 by 25 where the extra piece is parallel to the short sides.
October 22, 2016

math
the monthly charge for A is clearly 14.45 (0 minutes) So, for B, $(22.10-14.45)/45min = $0.17/min
October 21, 2016

Algebra
yes
October 21, 2016

Math
just multiply by 45 512.
October 21, 2016

Math
56000+9x = 16x
October 21, 2016

calculus
M'(x) = .0009x^2 - .132x + 4.64 Now just evaluate M' for your years.
October 21, 2016

Algebra
A is correct B is correct if the line goes through (-4,0)
October 21, 2016

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