Monday
June 27, 2016

Posts by STEVE

Total # Posts: 41,458

Math
surely, 3+3+3 feet, no? assuming the ribbon is to go once around the edges of the blanket...
May 1, 2016

Math
since u.v = |u||v|cosθ we must have cosθ = -1. In other words, v = -u
May 1, 2016

Algebra 1
B is good.
May 1, 2016

math
If you're using logs base 10, recall that log(32) = log(10*3.2) = log(10)+log(3.2) = 1+log(3.2) So, just look up log of 3.2 and add 1. Whoa - who uses tables these days?
May 1, 2016

Plane trigonometry
I don't know what "the five points" are, but here's the graph: http://www.wolframalpha.com/input/?i=2sin%28pi*%28x%2B1%2F2%29%29%2B1
May 1, 2016

trig
I'll use x for ease of typing tan(x)/(tan(2x)-tan(x)) tan(x)/((2tanx)/(1-tan^2(x))-tan(x)) tan(x)/((tanx(2/(1-tan^2(x)) - 1) 1/(2/(1-tan^2(x)) - 1) (1-tan^2(x))/(2 - (1-tan^2(x)) (1-tan^2(x))/(1+tan^2(x)) (1-tan^2(x))/sec^2(x) (1-tan^2(x))cos^2(x) cos^2(x)-sin^2(x) cos(2x)
May 1, 2016

Algebra
you are correct.
May 1, 2016

MEASUREMENTS
15m^2 * (3.28ft/1m)^2 * 1bag/20ft^2 * $2.00/bag = $16.14 you said M^2, then used YD^2. I used meters, but you can fix it. Your units do not work out right, and you lost the 15
May 1, 2016

Exponential Modeling
on the other hand, given the topic of the posting, 0.10(1+r)^40 = 1.25 (1+r)^40 = 12.5 1+r = 1.065 r = 6.5% per year
May 1, 2016

MATH
The scores are x x x x x x x x The median is 5, so they are x x x 5 5 x x x or x x x 4 6 x x x or 3 3 3 3 7 7 7 7 In the first case, 5 goals are scored. Otherwise, we need not have any scores of 5.
May 1, 2016

math
this is discussed at http://mathforum.org/sum95/suzanne/whattess.html google is your friend. Use it.
May 1, 2016

MATH- HELP PLEASE. IM LOST
the other side is either 3.7Ø or 3.7/Ø
May 1, 2016

Geometry ( helllppp pleaaassse )
#1. How can working with a single point on the ceiling tell anything about the length of the ceiling? #2. Drop the ladder to the floor, and mark where it hits. The use the ladder to construct a hexagon. Two of the main diagonals intersect at the center of the hexagon, just ...
May 1, 2016

Exponential Modeling
100 * (1/2)^7
May 1, 2016

Exponential Modeling
2000 * (1/2)^x
May 1, 2016

Exponential Modeling
p = 1013 * .88^x check for typos
May 1, 2016

Math
subtract 32 and multiply by 5/9 C = 5/9 (F-32)
May 1, 2016

Algebra
try this useful site: http://www.zweigmedia.com/RealWorld/LPGrapher/lpg.html
May 1, 2016

Math
5/6 * 1/2 = 5/12 you might as well ask, what is 1/2 of 5/6?
May 1, 2016

Math
a + a+d + a+2d = 24 a+3d + a+4d + a+5d = 51 now simplify the equations and solve for a and d.
May 1, 2016

Geometry
If the foot of the ladder started out at x ft away from the wall, then we know that the length of the ladder is 2x ft. With a 45° angle, then the two legs are x+8 ft, and the length of the ladder is (x+8)√2. So, now we have 2x = (x+8)√2 x(2-√2) = 8√...
May 1, 2016

Solid Mensuration
circles can be packed in many ways. If they are in a rectangular lattice then they may be in a 2x3 array, in which case, each circle's diameter is 1 foot. Surely by now you have made some attempt to solve the problem...
May 1, 2016

Matthhh
the straight-line distance is √(60^2+6^2) = 60.3 ft, so ...
April 30, 2016

Algebra
since there is a walkway on both sides, each dimension is increased by 2x. A(x) = (20+2x)(15+2x)
April 30, 2016

Algebra
since time = distance/speed, 6/(90-x) + 6/x = 4.5 x ≈ 1.35 km/hr
April 30, 2016

math
1 2 3 5 6 6 6 so, it can be 1. or even 1 5 5 5 5 5 6
April 30, 2016

Discrete Mathematics
26!/(8!12!6!) wow - who'd have thought that the entire set of books would contain only three different titles?
April 30, 2016

CES
1*22 + 9x = 8(x+22)
April 30, 2016

MATH
volume = 50*10*20 cm^3 1 liter = 1000 cm^3
April 30, 2016

algebra
I suspect the subtraction problem is 2x^2+5x-10 3x^2-x+9 ----------------- -x^2+6x-19
April 30, 2016

math
42 is the answer to the Ultimate Question of Life, the Universe and Everything -- surely it answers your feeble inquiry! Actually, I have no idea what you're talking about. which columns are you talking about? The only thing I can think of is that the line of cars looks ...
April 30, 2016

math
42
April 30, 2016

Math
well, 1 meter is 100 cm. So, how much is still needed?
April 30, 2016

rio claro west secondar
0.4^2 * 3.7 = 0.16 * 3.7 = ?
April 30, 2016

math
bzzt. The new value is 120% of the old one, so it increased by 20%.
April 30, 2016

math
3 of 8 = 3/8 = .375 = 37.5% t2o killed leaves 6 to share, so adjust the fraction. then subtract to find the change.
April 30, 2016

math
well, what are the nearby multiples of 500? ... 29,000 29,500 30,000 ... which is closest?
April 30, 2016

maths
you kidding me? You can't count by twos?
April 30, 2016

Maths
LCM(30,60,x) = 1500 30 = 2*3*5 60 = 2^2*3*5 1500 = 2^2*3*5^3 x could be 5^3 = 125 or any multiple of 25 consisting only of 2,3,5 as factors GCF(30,60,x) = 10 so, 125 is out, but 250 is in LCM(30,60,250) = 1500 GCF(30,60,250) = 10
April 30, 2016

Math
what is the difference between 6 and 10? How did you find it? Do the same step with the numbers above recall how to subtract negative numbers: 10 - (-5) = 10+5 = 15
April 30, 2016

Solid Mensuration
The diameter of the circle is 12 cm. The quadrilateral consists of two congruent triangles, with base 12 and altitude 4. So, its area is 48 cm^2
April 30, 2016

Maths
what is the difference between 6 and 10? How did you find it? Do the same step with the numbers above recall how to subtract negative numbers: 10 - (-5) = 10+5 = 15
April 30, 2016

GEOMTRY
1 yard = 3 feet 1 yard = 0.9144 meters 1 foot = 12 inches 1 foot = 0.3048 meters now just do the conversions
April 30, 2016

Calculus
If the rectangle has height x, then it has vertices (x,0), (x,x), ((20-x)/3,x), ((20-x)/3,0) so, its area is a = x((20-x)/3-x) = 20x/3 - 4x^2/3 da/dx = 20/3 - 8x/3 da/dx=0 at x=5/2, and a(5/2) = 25/3
April 30, 2016

Homework Dump
No ideas on any of these??
April 29, 2016

Homework Dump
no ideas on any of these?
April 29, 2016

Algebra
that is correct.
April 29, 2016

Algebra
nope. Subtract the exponents. 10^7/10^3 = (10^3 * 10^4)/10^3 = 10^4 or, more brute-force, 10*10*10*10*10*10*10 -------------------------- = 10*10*10*10 10*10*10
April 29, 2016

College Algebra
4-3(x+1)=2x 4-3x-3 = 2x 4-3 = 5x 1 = 5x x = 1/5 15x^2 + x = 2 15x^2 + x - 2 = 0 x = (-1±√(1+120))/30 = (-1±11)/30 = -12/30,10/30 = -2/5, 1/3 √(4x+5) = x 4x+5 = x^2 x^2-4x-5 = 0 (x-5)(x+1) = 0 x = -1, 5 only x=5 is a solution, since √(-4+5) = &#...
April 29, 2016

Algebra
6/(√3+2) = 6(√3-2)/-1 = 12-6√3 or, B
April 29, 2016

Algebra
6/(√3-2) recall that (a-b)(a+b) = a^2-b^2 multiply top and bottom by (√3+2) and you have 6(√3+2) ---------------- (√3-2)(√3+2) = (6√3+12/(3-4) = -6√3-12 check your text for typos. It looks like B except for the extra minus sign.
April 29, 2016

Math/Computer
try google, something like graphs ms word or something. (3,0) is just a point. Seems like a strange project.
April 29, 2016

Math
Since you have described no experiment, I will have to rely on the theoretical probability of 1/6, making my answer 50.
April 29, 2016

Algebra
Nope. What did you do? And use some parentheses: -3/(x+2) - 5/(x+3)
April 29, 2016

math
list the possibilities: P(WWW) = 2/4 * 1/3 * 0/2 P(BWW) = 2/4 * 2/5 * 1/4 ... P(BBB) = 2/4 * 3/5 * 4/6 then add up all the ones where the 3rd ball is black.
April 29, 2016

@Need Help
The subscripts are a trick of HTML. Most of the codes do not work on this site, but the sub and /sub tags work. For superscripts, the sup and /sup tags work. enclose the words in <> brackets to make them into HTML tags.
April 29, 2016

@Reiny
Some of these blokes use log6^(1/36) to mean log6(1/36), which is indeed -2 #2 ln(1/e^4) = ln(e^-4) = -4 #3 ok #4 ok #5 since the other logs specify a base, this must be just a common log, and log 10^8 = 8 #6 log3√3 = log33^(1/2) = 1/2
April 29, 2016

math -.-
just divide each term in the numerator by the denominator: (x^4+5x^3)/(3x^2) = x^4/(3x^2) + 5x^3/(3x^2) = x^2/3 + 5x/3 or, 1/3 x^2 + 5/3 x
April 29, 2016

Calculus
πr^2h = 200, so h = 200/πr^2 The cost is thus c = .02*2πrh + .06*2πr^2 = .04πr(200/πr^2) + .12πr^2 = 8/r + .12πr^2 dc/dr = -8/r^2 + .24πr dc/dr=0 when r ≈ 2.2 Now just crank out h and c
April 29, 2016

Math Check
Surely there should be π somewhere in the answer. And what is the shape of the solid? You have given a semi-circular base, but no other info.
April 28, 2016

Math
n+d+q = 22 5n+10d+25q = 175 n = 3d now crank it out
April 28, 2016

Math
just solve for t in -16t^2 + 120t+ 50 = 10 probably the quadratic formula will be helpful.
April 28, 2016

Calculus
Draw a side view. If the cylinder has radius r, and height h, then r^2+h^2 = 6^2 the volume of the cylinder is thus v = πr^2h = πr^2√(36-r^2) now just find dv/dr=0 and thus the maximum volume's radius.
April 28, 2016

Calculus
if the squares are of side x, then v = x(12-2x)^2 = 4x^3-48x^2+144x dv/dx = 12x^2 - 96x + 144 = 12(x-2)(x-6) so, v has a max at x=2.
April 28, 2016

Geometry
if the lateral area is 232pi, then pi rs = 232pi rs = 232 s^2 = r^2+h^2, so s = √(r^2+441) r√(r^2+441) = 232 r = 9.97 So, let's say r=10. Then a = 10√541 = 232.6 If the total area is 232pi, then use the adjusted formula for that.
April 28, 2016

Maths
the scale is 1cm:5km the area scale is thus 1cm^2:25km^2 multiply that by 405, and you have 405cm^2 : 10125km^2
April 28, 2016

homework
I assume the axis of rotation is the line y=49. So, the shells have thickness dy, and v = ∫[0,49] 2πrh dy where r = 49-y and h = (7+√(49-y))-(7-√(49-y)) v = ∫[0,49] 2π(49-y)((7+√(49-y))-(7-√(49-y))) dy = 26891.2π you can check...
April 28, 2016

Algebra
you can't look at the numbers 2,4,6,8,10 and see a common difference? man, you gotta not be trying!
April 28, 2016

Trigonometry
it is just the graph of csc(x) shifted left by pi/4 see it at http://www.wolframalpha.com/input/?i=csc%28x%2Bpi%2F4%29,+-pi+%3C%3D+x+%3C%3D+2pi
April 28, 2016

Math.
T4 and T9 are 5 terms apart. So, d=20/5 = 4 T15 = T9 + 6d = 35+6*4 = 59
April 28, 2016

Math
(x-15)*6 = 48
April 28, 2016

Algebra
since the denominators are the same, just add numerators. Just as 2/5 + 1/5 = 3/5, -4x/(x+7) - 8/(x+7) = (-4x-8)/(x+7) So, C -2/(x+3) - 4/(x-5) = [-2(x-5) - 4(x+3)]/[(x+3)(x-5) = (-2x+10-4X-12)/[(x+3)(x-5) = (-6x-2)/[(x+3)(x-5) So, A
April 28, 2016

Algebra
or C,S,U if drawn without serifs, and you don't count the end of a line as an angle.
April 28, 2016

Maths
1.16x = 1218
April 28, 2016

maths
86000 * 1.04^4
April 28, 2016

Algebra
#1 factored, you have (x+3)(x+3)/(x-1) * (x-1)(x-1)/(x-3)(x+3) The (x-1)(x+3) cancels, leaving (x+3)(x-1)/(x-3) so, A #2 The (x-2) cancels, leaving D
April 28, 2016

algebra 1
you are correct. Although, since formatting is not always clear online, you should say 1/(x-3) so it is not confused with 1/x - 3 which is how 1/x-3 would normally be interpreted.
April 28, 2016

Maths lit grade 11
#3.1.1: 175*15 + 275*20 + 250*30 = 15625 #3.1.12: each gallon is 3.785 liters, so just multiply #3.1.3: 1 mile = 1609 meters
April 28, 2016

Physics
2π radians in each circle, so the angular speed is 8π rad/s 2π*0.5 = π meters in each circle, so the linear speed is 4π m/s
April 28, 2016

Math, Pre-Calculus.
Actually I was wrong earlier, the answer is actually 26 minutes
April 28, 2016

Math, Pre-Calculus.
No way to tell. All we know is that the distance AC is somewhere between 28 and 154 miles. So, it will take between about 5 and 31 minutes. I suspect you have left something out,
April 28, 2016

Science
well, the total mass is 540g now do the divisions to get the fractions
April 28, 2016

Algebra
#1 ok #2 (x+2)/(5x-15) * (10x^2-25x-15) (x+2)/(5(x-3)) * 5(x-3)(2x+1) the 5(x-3) cancels, leaving (x+2)(2x+1) if x≠3
April 28, 2016

College Algebra (pt.3)
yes, you did it wrong. You left out the t part: 1000 e^.08t = 1750 e^.08t = 1.75 .08t = log(1.75) t = log(1.75)/.08 = 6.99 or, 7 years. surely you didn't think that the money wold almost double in a year and a half at 8%!
April 28, 2016

Algebra
when dividing, just subtract exponents 4^4/4^6 = 4^(4-6) = 4^-2 = 1/16 or, you could look at it as 4^4/4^6 = 4^4/((4^4)(4^2)) now the 4^4 cancels, leaving 1/4^2 = 1/16
April 28, 2016

College Algebra (pt.2)
ln(5x-3) = 0 5x-3 = 1 x = 3/5 Your notation is a bit odd. I think you mean log5(x) = 3 x = 5^3 = 125 log2(32) = x 5 = x because 32 = 2^5 log2(3x+1) = 4 3x+1 = 2^4 = 16 x = 5 ^ is usually reserved for exponents, not used in logs.
April 28, 2016

College Algebra
6^x = 6^(2x-1) x = 2x-1 x = 1 3^x = 1/27 3^x = 3^-3 x = -3 e^(3x) = 10 3x = ln(10) x = ln10/3 = 0.77 50e^(,09t) = 200 e^(.09t) = 4 .09t = ln4 t = ln4/.09 = 15.40 lnx = -0.25 x = e^-.25 = 0.7788
April 28, 2016

Calculus
lim(√(4+sinx)-2)/(3x) = lim (cosx/(2√(4+sinx)))/3 -> (1/(2√4))/3 = 1/12
April 28, 2016

MATH
great post!
April 28, 2016

Army school science
Sorry i was haste in my reply, the answer is actually defined by e=mc^2 unit vector as proven by einstein
April 28, 2016

Army school science
initial means "at the start" I assume you know what velocity is. So, you are talking about the speed of something at the start of some process.
April 28, 2016

Calculus
just use the usual distance formula. The distance between (a,b,c) and Ax+By+Cz+D=0 is |Aa+Bb+Cc+D|/√(A^2+B^2+C^2)
April 28, 2016

Algebra
You can use =/= for not equal. Or, you can find a site with math symbols, and copy/paste the ≠ character. How can you choose both A and C? (x+7) is a common factor, so A is the choice. Similarly, the second one is B. check your math.
April 28, 2016

programming
cool.
April 28, 2016

Complex Numbers
you've been posting this over and over. Did you think of google? Many problems posted here have appeared elsewhere. My first hit on google discusses this problem and one similar to it. Scroll down about halfway and you will find what you need. http://math.stackexchange.com...
April 28, 2016

permutations
there are 3! ways to arrange 3 things.
April 28, 2016

math
1/2 + 3/8 = ?
April 28, 2016

mathematics-Remainders theorem
using mod 21, 17^2^1 ~ 16 17^2^2 ~ 4 17^2^3 ~ 16 ... so, if n is odd, 17^2^n ~ 16 mod 21
April 28, 2016

algebra
x+y+z = 24 2x = z-2 z = x+y Now just solve for x,y,z
April 28, 2016

Math
12*6*3 ft^3
April 27, 2016

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