Friday
December 2, 2016

Posts by Steve

Total # Posts: 46,760

math
better this time. B is correct
November 16, 2016

Algebra
If you went from 9|9-8x|=2x+3 to 8x=2x-6 you certainly did not divide by 9 (on BOTH sides)! All absolute-value problems have two possibilities. First, 9(9-8x)=2x+3 81-72x = 2x+3 78 = 74x x = 39/37 Second, 9(9-8x) = -(2x+3) 81-72x = -2x-3 70x = 84 x = 6/5
November 16, 2016

Algebra
|-4(-2)-8| + |-1-(-2)^2| + 2(-2)^3 |-4(-2)-8| + |-1-4| + 2(-8) |8-8| + |-1-4| - 16 0+5-16 -11
November 16, 2016

Math
no. 5:9 = ratio of squares:total squares:circles = 5:4
November 16, 2016

Math - OK
Huh. CDAC is correct. Don't know why I said otherwise. My bad. Sorry.
November 16, 2016

Math
NO stop guessing and do the math! I even gave you the numbers!
November 16, 2016

Math
#1 15/50 = 3/10 #2 D is correct #3 70/200 = 35/100 #4 820 * .04 * 3 = ? Looks like you need some review.
November 16, 2016

Calculus
You should know immediately that 27/4 is not correct, since it does not lie in the interval [0,3]! You want c such that f'(c) = (f(3)-f(0))/(3-0) 3c^2 = 27/3 c = ?3
November 16, 2016

Math
2(x+12) = 3/2 (2x+12)
November 16, 2016

algebra 1
16/6
November 16, 2016

math
44 is the answer, so I suspect a typo. k = 8*110/20 = 44
November 16, 2016

math
well, 25=5^2 and 9=3^2, so try (5x+3)^2 = ? Note that you will get two answers.
November 16, 2016

MATH
Odd. It agrees with the formula here http://www.had2know.com/academics/paraboloid-surface-area-volume-calculator.html Better double-check my numbers.
November 16, 2016

MATH
In cylindrical coordinates, you have z = r^2 r = 2 symmetry allows us to say v = 4?[0,2]?[0,?/2] r^2 * r dr d? = 4?[0,2]?[0,?/2] r^3 dr d? = 2? ?[0,2] r^3 dr = 2? * 16/4 = 8?
November 16, 2016

math
k = 8*110/20 = 44 I suspect a typo somewhere.
November 16, 2016

Calc
I think it is true.
November 16, 2016

Algebra
It is the same as saying that a 0 is picked, either as 1st or 2nd pick: (1/6)(1) + (5/6)(1/5) = 1/3
November 16, 2016

Algebra
(3x/5-7)+7 Just get rid of the parentheses: 3x/5 - 7 + 7 3x/5
November 16, 2016

math
(5x+3)^2 = ?
November 16, 2016

Math
or, to work with smaller numbers, divide by 7 and then multiply by 22.
November 16, 2016

math
since time = distance/speed, 30/a = 30/b + 2 30/(2a) = 30/b - 1
November 16, 2016

Algebra
If you add the two equations, you get 12x = 24 because -8y+8y = 0 Now you know x=2, so y=0
November 16, 2016

Algebra
rewrite #1 and you get 10x-8y=20 2x+8y=4 Now add the two equations and y goes away. Solve for x, then get y.
November 16, 2016

Fibonacci Sequence - malformed
I assume you mean Un+1 = 3Un + 1/(5Un+3) since no other interpretation makes any sense. But that's not an integer sequence. So, how about fixing your typos, using parentheses, and maybe say U<n+1> to avoid mixing subscripts with numeric values?
November 16, 2016

FLAGPOLE MATH!
the ratio of shadow_length to height is the same for pole and girl, so s/12 = 4/5
November 16, 2016

ALGEBRA
13P9 but that is not one of the choices. Typo? However, 1,235,520 = 13P6
November 16, 2016

Math
actually, it's 1/2 that.
November 16, 2016

Math
use law of cosines to get the included angle t. Then 20*30*sin(t) = 430
November 16, 2016

Calculus
this is one of the standard trig integrals. Recall that d/dx sec(x) = sec(x) tan(x) The integral should now be clear.
November 16, 2016

Maths
There are 100 numbers. So, There are 50 pairs of numbers with sum=202 sum = 20200/2 = 10100
November 16, 2016

math
T2 and T5 differ by 3d = 6 Now you can easily get d and a, and S16 = 8(2a+15d)
November 16, 2016

Maths
(a+4d)/(a+d) = (a+13d)/(a+4d) a+d + a+4d + a+13d = 9 AP: a=3/13, d=6/13 T2 = 9/13 T5 = 27/13 T14 = 81/13 Clearly the have a common ratio of 3
November 16, 2016

Math
14 + 2/3 x = 5/4 x
November 16, 2016

Calculus
wherever e^x - 3x^2 = 0 That is, where e^x = 3x^2 You might not know just where they are, but you do know that 3x^2 is a parabola with vertex at (0,0). Since e^x is kind of flat near there, you know that for x<0 there will be an intersection. Now the question is, will there...
November 16, 2016

solid geometry
Here is a good place to start. http://mathcentral.uregina.ca/QQ/database/QQ.09.07/s/juan1.html
November 15, 2016

geometry
try http://www.volumeofcube.com/sphere-tangent-edges-volume
November 15, 2016

Table of Values
clearly, y=3 for any values of x.
November 15, 2016

Algebra2
thank you both
November 15, 2016

Algebra2
Determine whether the function represents exponential growth or decay. Then find the y-intercept. y=4(5/6)^x
November 15, 2016

precalc
again? http://www.jiskha.com/display.cgi?id=1479252554
November 15, 2016

Algebra2
try this site - it shows all the steps http://www.mathportal.org/calculators/polynomials-solvers/synthetic-division-calculator.php
November 15, 2016

Algebra2
Use synthetic division to find p(3) for p(x)=x^4-2x^3-4x+4 Show steps
November 15, 2016

Algebra2
is y=1/4x^0.5 a power function. Explain why or why not.
November 15, 2016

Calculus
f(4) = 8 f(9) = 12 slope of secant = 4/5 f'(x) = 2/?x so, find c such that 2/?c = 4/5
November 15, 2016

Math
(x+10) + (3x+10) = 76
November 15, 2016

pre calc
vertical asymptotes at -3,3 zeroes at -4,2,5 multiplicity 3,2,1 hole at x = -1 (x+1) occurs in both top and bottom no horizontal asymptotes http://www.wolframalpha.com/input/?i=((x%2B4)%5E3(x%2B1)(x%E2%88%922)%5E2(x%E2%88%925))%2F((x%2B3)%5E2(x%2B1)(x%E2%88%923))+for+-5%3C%3Dx...
November 15, 2016

Math help
two weeks for the trip half the distance each week, right?
November 15, 2016

Math
2(x+y) = 186 xy = 2156 x(93-x) = 2156 44*49 = 2156
November 15, 2016

Algebra
geez, just use y=x-2 in the first equation: x^2 - x(x-2) + 3(x-2)^2 = 15 3x^2 - 10x - 3 = 0 ...
November 15, 2016

Chemistry
I have no idea, but I'm sure our chemistry guys will weigh in. In the meantime, I find it hard to believe that you would be given such a question without having studied something like it already. How can you possibly have "no idea" where to start? Check your text...
November 15, 2016

Chemistry
try google - useful hits right off
November 15, 2016

math
pi/6 * 30^3
November 15, 2016

Chemistry
5 times the volume, so 1/5 the molarity. similarly for the 2nd part.
November 15, 2016

Algebra2
thank you
November 15, 2016

Algebra2
Which correctly describes the roots of the following cubic equation? x^3-5x^2+3x+9=0
November 15, 2016

math
3500 * e^(.04*3)
November 15, 2016

Calc
why not just use x? f(x) = 2secx+tanx f' = 2secx tanx + sec^2x = sec^2(x) (2tanx/secx+1) = secx^2(x) (2sinx+1) critical numbers are where sec^2(x) = 0 -- no solutions there sinx = -1/2 -- x = 7?/6, 11?/6
November 15, 2016

math
433/(433+424) Actually, that is just the probability that they answered "yes." They may have been lying...
November 15, 2016

Calculus
typo alert dy/dt at y=2.5 is -1/160, not -1/120
November 15, 2016

Calculus
When the water is 2.5m deep, the section draining is just a rectangular prism with area 160m^2 and height 1/2 m. So, draining at 1m^3/min, the water level is dropping at a rate of 1/120 m/min When the water is y m deep (y<2), the side cross-section of the pool is a right ...
November 15, 2016

math
10*6, right?
November 15, 2016

maths need help word problem
a+b=9 (10b+a)/(10a+b) = 6/5 54/45 = 6/5
November 15, 2016

Algebra
nope. 9x+3y = -22 has slope -3 better review how to find the slope.
November 15, 2016

Math
6/(6+7)
November 15, 2016

Math
come on -- just add them up
November 15, 2016

Math grade 6, Fractions
64-28=36 stickers that Dan gave Perry 36 is 4/5 of the original amount so, 9 is 1/5 Thus Perry had 45 to start with
November 15, 2016

maths
the 2nd pole is 20m away the 3rd is 40m and so on
November 15, 2016

Maths
9,999 and 10,000
November 15, 2016

wisdom'
and threw up
November 15, 2016

math
w(3w-2) = 65 what are the factors of 65?
November 15, 2016

Math
subtracting less means the result will be greater
November 15, 2016

Maths
Suppose 4 of each color were drawn. That makes 16 balls. The 17th ball would have to be the 5th of one of the colors.
November 15, 2016

math
if you say so. tan(75/2) = (1-cos75)/sin75 now, 75 = 90-(30/2) so, use the half-angle formulas on that
November 15, 2016

College Algebra
left: y = (x+4)^3 up: y = (x+4)^3 + 8 scale: y = 0.75((x+4)^3 + 8) = (3/4)(x+4)^3 + 6 = (3/4)x^3 + 9x^2 + 36x + 54
November 15, 2016

Arithmetic
.20 * 29.50
November 15, 2016

Math
man - just use the formula! Prt = 4010 * .052 * 4
November 15, 2016

geometry
see previous post for method.
November 15, 2016

geometry
well, the central angle is the same as the exterior angle... Or, you have an isosceles triangle with vertex of 60. The interior angles are made up of two of the triangles' base angles.
November 15, 2016

Chemistry
see the related questions below
November 15, 2016

Algebra
note that y changes by 2 when x changes by 1.
November 15, 2016

Math
10096
November 15, 2016

math
in 4 days, A&B&C did 4(1/24 + 1/36 + 1/48) = 13/36 of the job In the last 3 days, B working alone did 3/36 = 1/12 of the job That left A&B to do 5/9 of the work 1/24 + 1/36 = 5/72, so it took A&B 8 days to do their part.
November 15, 2016

math
none of the above, that's for sure.
November 15, 2016

Chemistry
google is your friend. And it's faster than waiting around here.
November 15, 2016

College Calculus
20 * (1/2)^(t/27)
November 14, 2016

Math : )
1/6 + 1/3 = 1/2 red or blue 3/7 * 1/2 = 3/14 green 3/14 x = 27 x = 126 21 red 42 blue 27 green
November 14, 2016

Tim
oh please - just use their definition! f2(x) - f3(x) = (1/8 (x+16)^2-98) - (2x+24) You might want to simplify that to x^2/8 +2x -90
November 14, 2016

Tim
no idea what you want to do. We could make g(x) = f2(x) - f3(x) or whatever you want to do. What do you mean when you say "this function"?
November 14, 2016

math
no files here. Surely you can compare two numbers!!???!?
November 14, 2016

Math
pieces: x x/2 x/2+4 x + x/2 + x/2+4 = 10 2x = 6 x = 3 check: 3 + 1.5 + 5.5 = 10 How did they come up with 2 3/4? I suspect a typo. f(-1/2) = 2(1/4) - 1/4 - 4 = -15/4
November 14, 2016

Geometry
Pair up the sides. You will find that the three sides of the two triangles match up, so since the two triangles have matching sides, they are congruent: SSS
November 14, 2016

Algebra
x + 2x+3 = 51
November 14, 2016

maths
40 spaces, so 41 poles. I think you can gt (c). Figure out how far the nth pole is.
November 14, 2016

maths
well t wholes is 24/24 So what do you add to 7 to get 24?
November 14, 2016

Math
and have someone seal the edges tightly with duct tape. Soon your pain will be gone.
November 14, 2016

College algebra
you have to multiply by 1/2 every 1500 years. So, the fraction remaining after t years is (1/2)^(t/1500) So, after 2800 years, the fraction remaining is (1/2)^(2800/1500) = 2^-1.8667 = 0.2742 = 27.42% Note that 2800 is almost 3000, or two half-lives. At t=3000, 1/2^2 = 1/4 = 0...
November 14, 2016

Math
Start with T1 which has sides 1 and 1. Its hypotenuse is ?2 Now draw T2, with its base as the hypotenuse of T1, and its other side is 1. T2 has sides ?2 and 1, so its hypotenuse is ?3 Keep drawing new triangles on the hypotenuse, and you will get a spiral figure. Tn has its ...
November 14, 2016

Math checking answers (Calculus Differentials)
I got the same answers. I hope we're both right!
November 14, 2016

Algebra
since the flat fee is less than the hourly fee, the more hours, the more pay.
November 14, 2016

Algebra
since the number of hours worked is the same, of course adding another $50 fee will pay more.
November 14, 2016

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