Friday
January 20, 2017

Posts by steve

Total # Posts: 47,946

pre-algebra
depends on what you mean by solve the question. Drawing a graph is one way to illustrate the relation between x and y. Another way is to fill in a table of matching values. Pick values for x and calculate the matching y values. Other questions might be to determine the axis ...
January 12, 2017

math
it is an odd function, so it is symmetric about (0,0)
January 12, 2017

Geometry
just use the distance formula.
January 12, 2017

Precalculus
well, every 2pi brings theta back to the same point, so ...
January 12, 2017

math unit 7 test
it should be clear that the inside of the arch cannot be covered by another arch.
January 12, 2017

math
ask google many many discussions
January 12, 2017

Math
5 ...
January 12, 2017

Graphing in the coordinate plane unit test
try google on some key topics...
January 12, 2017

algebra
try here. It shows all the steps. http://calc101.com/webMathematica/long-divide.jsp
January 12, 2017

Mathematical measurement
sure looks like 5:12 to me
January 12, 2017

Computing
n=1 s=1 for (i=1;i<=5;i++) { print s; n += 2; s += n }
January 12, 2017

Computing
depends on what information you want No idea what the "output of a triangle" is
January 12, 2017

C
add the numbers and divide by 10. If they are in an array called n, then sum=0 for (i=0 to 9) sum += n[i] avg = sum/10
January 12, 2017

math
4x-6 = x+15
January 12, 2017

Physical science
use the lengths as the legs of a right triangle. But, if the are not acting perpendicularly, you're out of luck.
January 12, 2017

math8
-9p-17=10 -9p = 27 p = -3 too bad you didn't bother to show your work.
January 12, 2017

math
the roots of D^2-6D+3 are -3±?6
January 12, 2017

Maths
5*9 = 45
January 12, 2017

Maths
what are two small factors of 45?
January 12, 2017

Linear Algebra
google the topic. You will find many good discussions, such as this one: http://math.stackexchange.com/questions/584132/proof-of-linear-independence-of-vectors-after-applying-a-linear-transformation
January 12, 2017

Math
us the law of cosines. You have two sides and the included angle.
January 12, 2017

Algebra 2 check my answer please?
500*2^(t/16) = 800 2*(t/16) = 1.6 t/16 log2 = log 1.6 t/16 = log1.6/log2 = 0.67807 t = 10.849
January 12, 2017

Algebra
what, you can't just plug in the number and find t? 0.81t^2 = 3 t^2 = 3/.81 = 3.7037 t = 1.9245
January 12, 2017

math
3*(2*6 + 2*8)
January 12, 2017

sdsdd
91/100
January 12, 2017

4th grade math
well, 5+15 = 20
January 12, 2017

Calculus
forget the integral. It's not elementary. besides, no one asked what f(x) was. The question was, where does it achieve its minimum value?
January 11, 2017

Math
e^(-?i) = cos(-?)+ i sin(-?) = -1
January 11, 2017

Algebra
it's the same as the number of ways to permute 2 of 3 things: 3P2 = 6
January 11, 2017

Math
c^2 = a^2+b^2 a = 1/2 bh If the perp from B to AC is BD, then using similar triangles, BD/AB = BC/AC
January 11, 2017

Math
assuming you meant speed (since the average velocity is zero after every lap!) You are correct. The distance covered is 352*1.5 Since it took four hours, the average speed is 352*1.5/4 mi/hr You can use the derivative if you insist, but since this is apparently a linear ...
January 11, 2017

math
y-1 = 3(x+2) y-1 = 3x+6 y = 3x+7 -7 = 3x-y 3x-y = -7 Looks like (A) to me
January 11, 2017

math
the slope is 3, so the point-slope form is y-1 = 3(x+2) or y-10 = 3(x-1) Now just massage that into one of the choices.
January 11, 2017

IPC
98 * 1.49/9.8
January 11, 2017

Maths
since their longitude differs by 180°, the lie on the same great circle, which passes through both poles. It would have been more challenging to prove that they lie on a slanted great circle.
January 11, 2017

Science
50m/2.8s = 50/2.8 m/s = ...
January 11, 2017

Calculus Please Help
Assuming the x values for the table are 1,2,3,4 then d/dx g(f(2x)) = g'(f(2x)) * f'(2x) * 2 = g'(f(2)) * f'(2) * 2 = g'(1) * 2 * 2 = 5*2*2 = 20 consider something like y = e^sin(2x) y'(x) = e^sin(2x) * cos(2x) * 2
January 11, 2017

Calculus
looks good to me
January 11, 2017

Calculus
Hmmm. h is constant at 12, so V = ?r^2h = 12?r^2 dV = 24?r dr ...
January 11, 2017

Math parallel lines and angles
no diagrams visible here. Just recall what you know about alternate angles and adjacent angles of transversals.
January 11, 2017

Angle Math Help!
well, you could always consider the 5-12-13 right triangle.
January 11, 2017

Geometry
I don't see how YO can divide the square. It just goes from a side to the center.
January 11, 2017

Math Calc
Hmmm 3.14*4.2^2 * 12.2 = 665.75 other than that, your logic is sound. Also, note that the error using 4.0-0.2 in for the low-side value differs by a smaller amount.
January 11, 2017

Math Calc
if 3.8 <= r <= 4.2, ?*3.8^2*12 <= v <= ?*4.2^2*12 544.32 <= v <= 665.01 ...
January 11, 2017

math algebra
15.99 + 0.93m = 259.65
January 11, 2017

math
ok
January 11, 2017

Calculus
see the further discussion on your earlier post.
January 11, 2017

Calculus
That is because x=0 is the single point where f'(x) = 0 the number zero is a single choice, not an absence of choices! The answer is 1 There is 1 (one) point on the interval [-1,1] where f(1)-f(-1) ------------ = 0 1 - (-1) That point is at x=0. Just take a deep breath and...
January 11, 2017

Calculus
Excuse me? Did you look at the graph? Did you actually read what I wrote? I don't mind helping you arrive at a solution, but I do expect you to actually read it, rather than just hold out your hand and say "gimme the answer." In fact, I did give you the answer.
January 11, 2017

Calculus
absolute value problems can get tricky, because the functions are not differentiable at any cusps. However, since (x^2-9)(x^2+1) is negative on [-1,1], f(x) = -(x^2-9)(x^2+1) This is a nice smooth polynomial, so it satisfies the requirements of the MVT on [-1,1]. Now take a ...
January 11, 2017

Calculus
v(t) = 0 at 0,?,2? If you exclude the endpoints of the interval, your answer is correct. But, we are working with the closed interval, including the endpoints. So, there are 3 points where v(t) = 0. Better review interval notation.
January 11, 2017

Calculus
v(x) = -sin(x) e^cos(x) since e^cos(x) is never zero, how many times in sin(x) = 0 in the interval? Your answer is correct on the interval (0,2?), but not on [0,2?]
January 11, 2017

Vectors
This is discussed here: http://math.stackexchange.com/questions/1408917/finding-vector-form-of-an-angle-bisector-in-a-triangle
January 11, 2017

Maths
Using x and y for syntactical reasons, See http://www.wolframalpha.com/input/?i=%7B%7B7,9%7D,%7B5,7%7D%7D*%7B%7Bx%7D,%7By%7D%7D+%3D+%7B%7B3%7D,%7B1%7D%7D
January 11, 2017

Calculus
try (lim x^3) * (lim sin(1/x)) x^3 -> 0 |sin(1/x)| <= 1
January 11, 2017

Maths
1 degree of latitude is about 111 km. So, 800 km/hr ? 800/111 = 7.2°/hr so, ...
January 11, 2017

Maths
Check the diagram. The radius of the latitude at angle ? is r*cos?. Since speed is proportional to the radius of rotation, if B is at angle ?, r cos22° = 2r cos?
January 11, 2017

math;););)
so, do you know the rotation matrix?
January 11, 2017

Math;);)
Actually, it's even better than that: |u + v|^2 ? |u|^2 + |v|^2 ? (|u|+|v|)^2
January 11, 2017

Calculus
since when is x^2/x^2 = 2? 10/10 = 1 z^3/z^3 = 1 don't forget your Algebra I now that you're taking calculus. Using the usual method, divide top and bottom by x^2. That gives you (1 + 2/x^2)/(1 - 36/x^2) as x^2 gets huge, 1/x^2 -> 0 and the fraction becomes 1/1 NOT 2!!
January 11, 2017

Calculus
as x gets huge, the 2 and the 36 become insignificant: y -> x^2/x^2
January 11, 2017

Physics
40 S = <0,-40> 70 N30ºW = <-35,60.6> add them up, then convert back to compass directions.
January 11, 2017

Math
1700 * .96*9
January 10, 2017

calculus
a = t^2-5t+3 v = 1/3 t^3 - 5/2 t^2 + 3t + C1 s = 1/12 t^4 - 5/6 t^3 + 3/2 t^2 + C1*t + C2 Now use the conditions to solve for C1 and C2.
January 10, 2017

pre-Calculus
a: odd b: even c: unknown check by using the fact that odd: f(-x) = -f(x) even: f(-x) = f(x)
January 10, 2017

Math
100/(b+24)
January 10, 2017

Trig
If the base is 2x, then 12.5/x = tan 55° The area is just 12.5x
January 10, 2017

Math
-.25x^2+5.5x-5.25 = -1/4 (x^2-22x) - 21/4 = -1/4 (x^2-22x+121) - 21/4 + 121/4 = -1/4 (x-11)^2 + 25
January 10, 2017

Math
8C4
January 10, 2017

Math
w(w+5) = 50 Now, which factors of 50 differ by 5?
January 10, 2017

Algebra
4a-2b+c = 5/2 c = 3/2 16a+4b+c = -121/2 F(x) = -5/2 x^2 - 11/2 x + 3/2
January 10, 2017

Math
just plug in the numbers. What do you get?
January 10, 2017

Math
there are only a few factors of 32, all of them powers of 2. It must have 2 digits, so there is only one that fits.
January 10, 2017

Math
well, they surely end in 3, so look up a list of primes and add them up.
January 10, 2017

Trig/PreCalc
as t changes from 0 to 1, x changes by -7 y changes by -6 x = 5-7t y = 2-6t
January 10, 2017

Trig/PreCalc
t = y-2 x = 5-3t = 5-3(y-2) It is clearly a line.
January 10, 2017

Trig/PreCalc
If we label the points A,B,C, then AB=?84 BC=?41 AC=?85 85 = 84+41-2?84?41 cosB Now you can use law of sine or cosine for one other angle, and then the angles sum to 180.
January 10, 2017

Math
A = 2/3 b b = 3/4 c a+b+c = 8200 Now just solve for c.
January 10, 2017

Chemistry
For the following reactions, determine the equilibrium constant equation. 1) CO2(g) + H2(g) CO(g) + H2O(g) 2) 2NO(g) + 2H2(g) N2(g) + 2H2O(g) 3) Cu(s) + 2Ag+(g) Cu2+(g) + 2Ag(s) 4) H2(g) + I2(g) 2HI(g)
January 10, 2017

Pre Calc
{1}
January 10, 2017

Math
if the dimensions are x,y,z then there are 3 pairs of parallel faces. The area is thus 2xy + 2xz + 2yz Now just plug in your numbers.
January 10, 2017

algebra
what two factors of 32 differ by 4? y = (x-8)(x+4) the discriminant is b^2-4ac = 16+128 = 144
January 10, 2017

Algebra
use what you know about arithmetic sequences, in this case a = 1 d = 2 n = (49-1)/2 + 1 = 25 S25 = 25/2 (1+49)
January 10, 2017

algebra
you know that the axis of symmetry is at x = -b/2a = 4/2 = 2 Symmetry means that the two roots are equally spaced on either side of the axis.
January 10, 2017

algebra
42
January 10, 2017

algebra
4*3*2 = 24 5184/24 = 216 = 6^3 ... Or, more usually you will be asked to solve 4x * 3x * 2x * 5184
January 10, 2017

algebra
2b+2 = 4b-46
January 10, 2017

Graphing in the Coordinate Plane Unit Test
if you cannot plug in the values and evaluate the expression, you are in deep trouble. For example, is (5,3) a solution? -4(5)-9 = -29 Nope, not equal to 3.
January 10, 2017

trig
duplicate posts are a waste of time, both yours and ours...
January 10, 2017

math
draw a diagram review your basic trig functions. (h-5)/90 = tan 81°
January 10, 2017

Math
all correct.
January 10, 2017

geometry
Totally!
January 10, 2017

Math grade 6, quadrilateral logic
Hmmm. I thought a trapezoid was a quadrilateral with only one pair of parallel sides. I guess it depends on who is doing the defining...
January 10, 2017

Math
see your previous post.
January 10, 2017

algebra 2
What is the s9mplermform of the radical expression? sqrt36g^6 my answer is 6lg^3l
January 10, 2017

Algebra2
?5 * 3?5 = ?5*?5 * 3 = ...
January 10, 2017

Algebra2
Find the product sqrt 5 times 3sqrt5
January 10, 2017

math
Looks like C to me. Draw a line and locate points P and Q. Now, note that R can be on either side of P.
January 10, 2017

geometry
see http://www.ask-math.com/constructing-triangles.html
January 10, 2017

Math science etc
google is your friend: http://www.ask-math.com/constructing-triangles.html
January 10, 2017

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