Saturday
December 3, 2016

Posts by steve

Total # Posts: 46,787

math
you have two points: (0,55) and (12.5,70). The slope of that line is 15/12.5 = 1.2 y = 1.2x + 55
October 25, 2016

Math, Quadratic Functions
because when x is small, x^2 changes slowly. As x gets larger, then x^2 starts changing more rapidly. There are no sudden changes in growth rate.
October 25, 2016

Math
13/1.88 Don't be baffled by the decimal stuff. Just use easy numbers. If one Mars year were two earth years, birthdays would happen half (1/2) as often.
October 25, 2016

math
still 12
October 25, 2016

math
(5x-4)(x-4) = 448 x=12
October 25, 2016

Math
so how is 1/3 of 60 = 19.8? just as a suggestion, 1/12 of 60 = 5 Make your fractions into */12 and things get easy. Or, since only 1/3 are yellow, you could take out 2/3 of the beans with no yellows. 2/3 of 60 = 40. So, you'd have to take out 41 ti be sure of getting a ...
October 25, 2016

Science: The Similarities
no, but I'm sure google can.
October 25, 2016

math
2-3+2 = 1
October 25, 2016

Math
You lost a minus sign and made a typo. The steps should be (2^-16 x 5^10) x (5^-2/ 2^3)^4 x 2^28 (2^-16 x 5^10) x (5^-8/ 2^12) x 2^28 Now just collect powers on each base factor. 2^(-16-12+28) x 5^(10-8) = 5^2 = 25
October 25, 2016

Sequence
ar^2 = 4a ar^5 = 3(ar^3)+32 Now crank it out
October 25, 2016

algebra
no idea, but there are lots of handy calculators online. Or, you can just do the work, and we can check your answer ...
October 25, 2016

Algebra 2
well, 1/2 = 4/8, so ...
October 25, 2016

Mathematics
you need a common difference, so (4k+3)-(3k+2) = (6k-1)-(4k+3)
October 25, 2016

mathematics
38756 * .96^n = 21578
October 25, 2016

Probability and Stats
1/4 * 100 = 25
October 25, 2016

Math
699/0.40 = ?
October 25, 2016

math
and now there's no money left. What a shame.
October 25, 2016

maths
so, after the substitution, what do you have?
October 25, 2016

maths
so, did you try the hint? Time to start showing some of your work ...
October 25, 2016

maths
(i) assuming the usual sloppiness with parentheses, 3^(x+1) - 1 = 5 3*3^x = 6 3^x = 2 x = log32 (ii) 3*4^x = 4*4^(1-2x) 3*4^x = 4^2 /4^(2x) 3*4^(3x) = 16 4^(3x) = (16/3) 3x = log4(16/3) x = (1/3) log4(16/3)
October 25, 2016

Math
(12 3/8) / (3/4) = 16 1/2
October 25, 2016

maths
see below
October 25, 2016

Mats Exercise 1.7
so what? and why the backslash? Is that some new operator?
October 25, 2016

maths
check the discriminants
October 25, 2016

maths
geez - AGAIN? see the related questions below
October 25, 2016

algebra
nice try.
October 25, 2016

Statistics Probability
1/5 zero
October 24, 2016

Calculus
wait. 12 is the average slope: (f(3)-f(1))/(2-1) The average value is the integral ∫[1,3] f(x) dx ----------------- = 14     2
October 24, 2016

Calculus
I also get 12.
October 24, 2016

math
well, 23/100 = 23% so, what do you think.
October 24, 2016

math
x=-1 is the equation for the axis of symmetry y = a(x+1)^2 + k y=32 is the maximum value so a is negative y = -a(x+1)^2 + 32 3 is the x intercept This cannot be the only x-intercept, or the maximum value would be 0. So, assuming y(3) = 0, -a(4^2)+32 = 0 x = 2 y = -2(x+1)^2 + 32
October 24, 2016

Math
L1: 5x+3y=7 has slope tanθ = -5/3, so θ = -59° So, L2 needs a slope of tan(-6.6°) = -0.115 or tan(-111.4°) = 2.55
October 24, 2016

MATH HELP
you and your alternate identities need to check the related (and in fact identical) questions below. Stop posting it over and over.
October 24, 2016

Mathematics
the radius of the earth at that latitude is r = 3960 cos13° so the speed there is 2πr/24 mi/hr
October 24, 2016

Maths
oops. not so, due to h0 so, find t when h(t)=0 then use that to get v(t) at that time.
October 24, 2016

Maths
the same as when it went up.
October 24, 2016

Math
see other post.
October 24, 2016

Math
at that latitude r = 3960 * cos(13) so the speed is 2*pi*r/24 mi/hr
October 24, 2016

math
just count the possibilities on each dial, and multiply them.
October 24, 2016

Algebra II
A) note that the common difference between terms is 4. B) The common ratio between terms is 5 if I assume a typo and the first entry is -3. Otherwise, it is more complicated, and 3 terms don't give much to go on.
October 24, 2016

help sir steve
I'll let wolframalpha do it: http://www.wolframalpha.com/input/?i=arccosh(-18%5E(1%2F5)) Recall that arccosh(x) = ln(z + sqrt(z^2-1))
October 24, 2016

Math
As written, each is a function. Now, if you want to check whether y is a function of x, just check to be sure that for each x value there is a single y which satisfies the equation. hint: (-3)^2 = (+3)^2 for example
October 24, 2016

True or False Math
False a ∊ {a, b, c} c ∊ {a, b, c} {a, c} ⊂ {a, b, c}
October 24, 2016

Math
(2/9) / 2 = 2/9 * 1/2 = 2/18 = 1/9 Or, just consider that 2/2 = 1 so, 2 ninths / 2 = 1 ninth 2/7 / 2 = 1/7 2 dogs / 2 = 1 dog just half of what you start with.
October 24, 2016

pre-calc.
#1: well, f(x) = 1 for every x≠0 similarly for #2, f(x) = (x+1) for every x≠1 use your favorite online grapher to show that there is just a hole at the point in question. The limit is clear.
October 24, 2016

Math HELP!
what? You do the hard stuff, and can't rearrange terms? y = 2x-4 2x-y = 4
October 24, 2016

math
30-19 = 11 so split the difference. It will be the same as 19 - 13 1/2
October 24, 2016

Math
see your standard Z table. Here is a useful site: http://davidmlane.com/hyperstat/z_table.html
October 24, 2016

calc
uh, ... do it for each piece.
October 24, 2016

Algebra
Clearly the time working together will be less than for either working alone. 75 cannot be the answer. You need to find x such that 1/x = 1/90 + 1/60 x = 36 You have to consider how much work each one does in a minute. That is what you can add; not the required time.
October 24, 2016

Five Number Summary
have you learned how to find the mean and median? What do you get?
October 24, 2016

Math
well, the circumference is 50π
October 24, 2016

geometry
huh? If 20 is not the vertical, what is it? maybe the horizontal distance is √(30^2 - 20^2) Hard to tell from your garbled posting.
October 24, 2016

physics
√(12^2+24^2)
October 24, 2016

maths
In (a), y=4z+25 so, use that in (1) and (2). Then you just have to solve two equations. Similarly in (b), #3 gives y = 3x+2z+7 Use that in (1) and (2)
October 24, 2016

Math
If x have heard and y have not, and if r is the spread rate, r = kxy That is, r/(xy) = k is constant. So, you want r such that r/(500*300) = 20/(200*600)
October 24, 2016

maths
You and "Steve" need to get together. See related questions.
October 24, 2016

maths
all is explained in your previous posts.
October 24, 2016

maths
1a) Solve each of these questions by factorising the left hand side into a product of linear factors: (i) x^2 - 6x - 40 = 0 (ii) 3x^2 + 20x - 7 = 0 For each question in part (a), check your solutions by substituting them back in to the equation.
October 24, 2016

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

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