Thursday
September 18, 2014

Posts by Damon


Total # Posts: 18,530

Physics
R = 10 + 8 + 27 i = 9/R for each Vn = i * Rn the sum of Vn better equal 9
June 2, 2014

Math
a + c = 390 a = 2.25 c so 2.25 c + 1 c = 390, solve for c then for a Revenue = 8 a + 3 c
June 2, 2014

Math
You are welcome.
June 1, 2014

Math
tan angle = 34/12
June 1, 2014

science
When you post a question again and again and no one replies, perhaps there is something missing in the question that renders it incomprehensible. We have no idea where or what you are talking about, on a beach or in a bottle or what else is behind your question.
June 1, 2014

algebra2/ Trigonometry
24+22+14+12 = 72 marbles yellow = 14/72 = .1944.... or about 19.4 % do the others the same way
June 1, 2014

Geometry
You are welcome.
June 1, 2014

Geometry
Volumes scale as the CUBES of corresponding lengths of similar figures (25/35)^3 = (5/7)^3 = 125/343
June 1, 2014

typo
I have no idea what you mean there are about 6*10^23 anythings per mole just like there are 12 anythings per dozen
June 1, 2014

trigonometry ans.
You are welcome.
June 1, 2014

trigonometry ans.
right, you asked for nearest foot
June 1, 2014

trigonometry ans.
tan 53 = height/distance yes, 66 to nearest foot The right angle is at the foot of the tree. ALWAYS draw a picture tan 53 = opposite (tree) / adjacent(along ground the hypotenuse is along your line of sight, not used here
June 1, 2014

physics
momentum after momentum before sum of m after v after = sum of m before v before .16 (27.5) + (68) v = 68.16 (2.55) solve for v second skater: (60.5+.16) v = .16(27.5) solve for second skater v
June 1, 2014

Geometry
ok, always sketch a graph
June 1, 2014

Geometry
It gets smaller.
June 1, 2014

help
You are welcome.
June 1, 2014

help
tan 12 = 40/d d = 40/tan 12 = 188 meters ! If that diver is wearing a hard hat, he is going to be a wreck himself by the time he gets there and it will take so long that he will need to make decompression stops upon ascent to avoid getting the bends. Move the stupid ship !
June 1, 2014

Geometry
You are welcome.
June 1, 2014

Geometry
https://www.khanacademy.org/math/geometry/similarity/triangle_similarlity/v/similarity-postulates
June 1, 2014

Geometry
http://www.regentsprep.org/Regents/math/geometry/GP11/LsimilarProof.htm
June 1, 2014

Geometry
ratio of areas of similar figures is ratio of corresponding lengths squared 20/16 = 5/4 so 25/16
June 1, 2014

algeba/can you please ck my answer
1598 * 1.05 = 1677.90 total cost with tax 1677.90 * .14 * 3 = 704.72 total interest so total amount to be paid = 2382.62 divide by 36 months = 66.18 per month Note this "add on rate" is a rip off. As you pay the principal back, the amount you owe should decrease. If ...
June 1, 2014

Algebra 1
Nasty !!! at 2:30 m
June 1, 2014

Algebra 1
Oh delete the x = 5, denominator of original is 0 Not in domain
June 1, 2014

Algebra 1
{ (6x-14) + (x^2-5x) ] /[2(x-5) ] =16/[2(x-5)] x^2 + x - 14 = 16 x^2 + x - 30 = 0 (x-5)(x+6) = 0 x = 5 or -6
June 1, 2014

math
7 n = 400 - 190
June 1, 2014

statisticsWere did i go wrong thank you
I am happy to help. You are welcome :)
June 1, 2014

statisticsWere did i go wrong thank you
mean = 97 correct difference and square of difference -14 196 -1 1 3 9 3 9 9 81 sum of squares = 296 variance = 296/5 = 59.2 square root of variance = standard deviation = 7.69
June 1, 2014

whoops, order wrong
then divide by n then take the square root
June 1, 2014

statisticsWere did i go wrong thank you
http://www.mathsisfun.com/data/standard-deviation-calculator.html
June 1, 2014

statisticsWere did i go wrong thank you
then take the square root, then divide by n
June 1, 2014

statisticsWere did i go wrong thank you
The differences SQUARED
June 1, 2014

Physics
u = 1540 cos 52 = 948 the whole time Vi = 1540 sin 52 = 1214 at start v = Vi - 9.8 t 0 = 1214 - 9.8 t t = 124 seconds to top so 2 t = 248 seconds in the air (part B) range = u * 2t = 234,871 meters or 235 km
May 31, 2014

Statistics/I am confused
difference from mean = 115-105 = 10 below mean variance = 25 so standard deviation = 5 so z = -10/5 = -2 it is two standard deviations below mean for z = 2 look up in normal table http://davidmlane.com/hyperstat/z_table.html probability = .0228
May 31, 2014

algebra
|+1 +0 | |-2 +3 +8 | |+0 -1 | |-3 +5 -1 | = | -2 +3 +8 | | +3 -5 +1 | so (-2,3), (3,-5), (8,1)
May 31, 2014

geography
Just some suggestions 1. Location maybe in Southern California on the west coast of USA. 2. Place What defines this place? Hollywood? Freeways? 3. Human interaction with environment You have to mention smog and the use of cars and air conditioning. You have to point out that ...
May 31, 2014

math
(y+6)^2 + (-6)^2 = 100 y^2 + 12 y + 36 + 36 = 100 y^2 + 12 y - 28 = 0 (y-2)(y+14) = 0 y = 2 or -14 y = 2 is on your list
May 30, 2014

Math
Note the tangent is perpendicular to the radius where it hits the circle.
May 30, 2014

Math
21/2 is rational but not integer and it is more than 5 and more than 2 so a square would solve the problem. put points at (21/2, 21/2) in quadrant 1 then its image (-21/2, 21/2) in quadrant 2 then (-21/2, -21/2) in quadrant 3 and (21/2,-21/2) in quadrant 4.
May 30, 2014

Statistic
5. 115 - 100 = 15 z score means how many standard deviations away from mean so 15/10 = 1.5 A+ :)
May 30, 2014

Statistic
http://easycalculation.com/statistics/standard-deviation.php
May 30, 2014

Multiply write the result in scientific notation.
(9*10^4)(8*10^6) = 72^10^10 = 7.2*10^11
May 30, 2014

physics
10 * 44 = 440 meters
May 30, 2014

geometry
volume = (1/2) (4/3) pi r^3 = (2/3)pi r^3 so 486 pi = (2/3) pi r^3 so r^3 = (3/2)(486) = 729 area of half of hemisphere = (1/2) 4 pi r^2 = 2 pi (729)^(2/3) = 162 pi
May 30, 2014

physics
a = F/m a = (2.36 cos 44.8 ) /.22
May 29, 2014

algebra
Evaluate 3p/q when p=2 and q=6. Answer:1 YES Use < > or = for __ to write a true sentence: 0.001 __ 0.0010 Answer:< Question 3 _______________ = ___________________ Evaluate -3/8 - 5/8. Answer:7 Question 4 ____________________ -8/8 = 1 __________________ Evaluate: 84...
May 29, 2014

engineering mechanics
Just look at the solved problems linked below. This problem may be the most common in all of algebra and beginning physics :) Remember and hour is 3600 seconds.
May 29, 2014

math
Equations have = signs
May 28, 2014

trig
(1 + tan^2A)(1 -sin^2A) but (1 - sin^2 A) = cos^2 A and (cos^2A/cos^2A + sin^2A/cos^2 A) = 1/cos^2 A so we have (1/cos^2 A)(cos^2 A) which is 1
May 28, 2014

math
tan theta = 9/175
May 28, 2014

Math
Nor do I. Have you mixed up two problems?
May 28, 2014

math
11 + 5 = 16
May 28, 2014

Science
Mass does not depend on gravitational constant anywhere. 5 kg is 5 kg b) m g = 5*9.81 N
May 28, 2014

ENGLISH
Pretty Calf says exactly why.
May 28, 2014

math
Find LCD 40 = 2*2*2*5 25 = 5*5 10 = 2*5 so 2*2*2*5*5 = 200 so 15/200 , 32/200 and 20/200 3/40 1/10 4/25 B
May 28, 2014

precal help asap
There are in fact an infinite number of solutions I would try each of the choices I have my calculator set on degrees so 2pi = 360 tan^2 (360/3 ) = 3 Yes that works tan 180 does not work tan -60 does not work tan 300 = nope so only A
May 28, 2014

algebra/please help I have been wrong twice
You are welcome.
May 28, 2014

algebra/please help I have been wrong twice
p(oil) = 1/40 p(gas) = 1/20 p(oil and gas) = 1/800 so (1/40)(395,000) = 9875 (1/20)(125,000) = 6250 (1/800)(520000) = 650 So I get 16,775 income - 25,000 expense = -8225 They expect to lose money I think.
May 28, 2014

PRECAL MULTIPLE CHOICE
sin A/a = sin B/b sin B = (b/a) sin A = 1.036 no solution (sin may not be greater than 1)
May 28, 2014

math
f' = -12 x^2 + 16 x + a f" = -24 x + 16 sheds water when when f" is negative holds waster when f" is positive f" is 0 when x = 2/3 sheds water when x < 2/3 holds water when X>2/3 so B
May 28, 2014

math
f(4) = 64 f(1) = 1 63/3 = 21 = average slope in interval f' = 3 x^2 = 21 x = +/- sqrt 7 in interval x = sqrt 7 = c so A
May 28, 2014

Physics
g is about 32 ft/s^2 in these obsolete units 61.8 miles/hr * 5280 ft/mi * 1 hr/3600seconds = 90.6 ft/s 7 * 32 = 224 ft/s^2 a = change in v/change in tim 224 = 90.6/t t = .4 seconds
May 28, 2014

Science
+2e
May 28, 2014

Science
By the way, remember transportation losses and expenditures including expense and losses of electrical cables particularly under sea.
May 28, 2014

Science
Actually I did not intend to write a PhD thesis before lunch. Post your attempt first please. Use the sources you have learned about (coal, oil, natural gas (fracked or otherwise) , nuc, hydro, wind, waves, solar panels etc )
May 28, 2014

physics
away of course in general for non-relativistic Doppler effect f heard = f emmitted (c+vr)/(c+vs) c = v of wave vr = v receiver (plus if toward source) vs = v source, (plus if source moving away from receiver) use your c of sound 78 = 80 (c+0)/(c+vs)
May 28, 2014

calculus
Horizontal speed constant forever = 80 cos 45 = u = 56.6 ft/s Initial vertical speed Vi = 80 sin 45 = 56.6 ft/s Now you did not give me the quadratic so I will have to solve it with physics v = Vi - g t where g = about 32 ft/s^2 in these obsolete units then h = Hi + Vi t - 16 ...
May 28, 2014

English
I think it could mean one of two things: 1. Instead of arguing about who would pay how much, I "simply" picked the bill up. 2. I "just" picked the bill up a minute ago.
May 28, 2014

Math
2/50 - 75/50 = -73/50
May 28, 2014

technology
work in = work out 10 * 100 = F * 20 F = 50 N
May 28, 2014

Physics
volume of man = 75 liters so density of man = 80 kg/75 L = 1.067 kg/L x(fat density ) + (1-x)(bone density) = 1.067 .9 x + 1.1 (1-x) = 1.067 1.1 - 1.067 = (1.1-.9)x x = .167 or 17%
May 28, 2014

Algebra 1
sorry, read reply wrong. You have it fine
May 28, 2014

Algebra 1
number or blacks = b number of whites = b+10 total - b +b+10 = 2 b+10 black first b/(2b+10) now we have b-1 blacks we have b+10 whites still total = 2b+9 b/(2b+10) * (b+10)/(2b+9) note - not 2b+10 in numerator
May 28, 2014

trig
rise = .1 run tan theta = .1 theta = 5 deg
May 27, 2014

algebra
36 possible outcomes if order matters If it is the sum that matters you have to figure a different probability for every sum for example there are 4 ways of getting a sum of 5 1+4 or 4+1 2+3 or 3+2 to get a sum of 6 though, there are 5 ways 1+5 or 5+1 2+4 or 4+2 3+3 On the ...
May 27, 2014

algebra
I suspect they mean including 1 and 100 and not 2 through 99 so 100 numbers total so 5, 10, 15 ...... 100 are multiples How many? 10 * 2 = 20 20/100 = 1/5 so 1 - 1/5 = 4/5
May 27, 2014

Trig
current north speed = 3.2 sin 38=1.97 N current west speed = 3.2 cos 38 = 2.52 W Total North speed = 8.5+1.97 = 10.47 Total west speed = 2.52 tan theta = 2.52/10.47 theta = 13.53 degrees west of north or 47.47 degrees north of west Is the direction you are GOING (you are still...
May 27, 2014

trig
cos 35 = h/15
May 27, 2014

Physics
Yes, if the friction was less than the force required to accelerate the upper block, it would accelerate more slowly than the bottom one. In other words slip :)
May 27, 2014

Physics
You are welcome :)
May 27, 2014

Physics
F = - k x = -130 (.1) = -13 N if they do not slip m = 6.25 kg a = 13/6.25 = 2.08 m/s^2 force required to accelerate small block = 1.25 *2.08 = 2.6 N do we have that much? weight = m g = 1.25 * 9.81 so max friction = .3*1.25*9.81 = 3.68 N so no slip :)
May 27, 2014

Math? Check Answers Please!!
You are welcome :)
May 27, 2014

Math? Check Answers Please!!
1) yes 2)4^4 * 4^6 = 4^(4+6) = 4^10 3)4^(4+44) = 4^48 4) 3^(4-4) = 3^0 = 1 note ANYTHING^0 = 1 5) 3^-3 = 1/3^3 = 1/27 yes
May 27, 2014

Physics
2.05 2.04
May 27, 2014

Physics
initial momentum forward = (69.5+.47)(2.15) = 150.4 so 150.4 = 69.5 v + .470*16 in second part v ball = 2.15 + 16 = 18.15 m/s 150.4 = 69.5 v + .470*18.15
May 27, 2014

Science
Thanks for catching that !!!
May 27, 2014

Science
You have to add heat so endothermic 129 J per 2 mol 1 mol = 23 + 1 + 12 + 48 = 84 grams 2 mol = 168 grams we only have 18.5 grams so (18.5/168)129 = 14.2 Joules
May 27, 2014

Physics
change in x momentum = 2 * mass * x velocity = 2 * .275 * 4.5 sin 35 force on ball by wall = change in momentum /time = change in momentum/.008 wall on ball is -x so ball on wall is + x direction
May 27, 2014

Math Homework: Check Answers
You are welcome.
May 27, 2014

Math Homework: Check Answers
1. Suppose you earned 8t - 3 dollars on Monday and 6t + 5 dollars on Tuesday. What were you total earnings? Simplify your answer. A) 2t + 2 B) 2t - 8 C) 14t + 2 D) 14t - 8 Answer: A ------------------------------- 8t+6t= 14 t !!! so 14 t + 2 -------------------------------- 2...
May 27, 2014

physics
r w^2 = Ac = 6*10^5*9.81 w^2 = 58.9 * 10^5 /.02 = 29.4 *10^7 = 2.94 * 10^8 w = 1.72 * 10^4 = 17,200 radians/sec
May 27, 2014

probability
-->1 2 3 4 5 6 1 ----- * 2 ----* 3 --* 4 * 5 6 36 possible outcomes get 5 from four of them so p = 4/36 = 1/9 (1/9)180 = 20 times
May 27, 2014

geometry
Area of base = (1/2)(.25)(.25 sin 60) = .0271 m^2 .0271 * h = 7.5 h = 277
May 27, 2014

physical science
You are welcome :)
May 27, 2014

physical science
see below I got 94 %
May 27, 2014

physical science
100( power out ) /power in 100*3760/4000 = 94 %
May 27, 2014

Geometry
between 0 and 1 hour Ann went 3 miles per hour between 1 hour and 4 hours, Ann went 2 miles (5-3) so 2 miles /3 hours = .67 mph between 4 hours and 7 hours Ann went zero miles (5-5) so zero miles/hour (lunch break?) between 7 ours and 10 hours (3 hours) Ann went 5 miles (10-5...
May 27, 2014

ALGEBRA! URGENT. Check Answers!
You are welcome.
May 27, 2014

ALGEBRA! URGENT. Check Answers!
yes
May 27, 2014

ALGEBRA! URGENT. Check Answers!
in #3 + 5x - 7x = NEGATIVE 2 x #4 negative 7
May 27, 2014

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