Saturday
December 10, 2016

Posts by Damon

Total # Posts: 28,463

?
dilated how much?
August 31, 2016

Math
n and n+1 1/n + 1/(n+1) = 17/12 12(n+1) + 12 n = 17 n(n+1) 12 n + 12 + 12 n = 17 n^2 + 17 n 17 n^2 - 7 n - 12 = 0 hummm, suspect typo
August 31, 2016

Science
Yes
August 31, 2016

ah, magic ?
I do not see the figure.
August 31, 2016

Algera check answers
Which of the following is the most appropriate unit to describe the rate at which data is transferred using the internet? =========================== Time needed is a function of megabits of data. D yes ========================== 2 + (x + y) = (2 + x) + y is an example of ...
August 31, 2016

math
4 10/15 - 3 6/15 = 1 4/15
August 31, 2016

Physics
50 * 9.81 * 2.4 = about 1200 J If you say g = 10m/s^2 you get exactly 1200 J
August 31, 2016

Physics
a = change in velocity/change in time = -20/4 = -5 m/s^2 F = m a = -300*5 = -1,500 Newtons
August 31, 2016

math
x^-n = 1/x^n 5 * 10^-2 = 5/10^2 = 5/100 = 0.05
August 30, 2016

math
( distributive property :)
August 30, 2016

math
if I have 100 dollars and increase that by 5% I then have 100*1 + 100*0.05 which is 100 (1.05)
August 30, 2016

Physics
s is initial speed Vi = s sin 6 v = Vi - g t at top v = 0 t = s sin 6 / 9.81 u = s cos 6 11 = u t t = 11/(s cos 6) so 11/(s cos 6) = s sin 6/9.81 solve for s, the initial speed get t then h = .39 + Vi t - 4.9 t^2 for part b u = s cos 6 new u = .25 s cos 6 then t to fall from h...
August 30, 2016

Physics
Now I did the squash one. Based on that you should be able to do this one.
August 30, 2016

Pre-Calculus
sec = 1/cos note cos is 0 at pi/2 so sec is undefined there (infinite + or -) in quadrant I cos is + so sec is + but in quadrant II cos is - so sec is - note cos always </= |1| so |sec| always >/= |1| that should help with your graph
August 30, 2016

math
It is divisible by 2
August 30, 2016

Pre-Calculus
y = sin x what values can x have? any real number right? y = sin^-1 x what values can x have? Only between -1 and + 1 right?
August 30, 2016

physics
you drove how long at 95? 180 km / 95 km/hour = 36/19 hour (45/10 - 36/19)hours at 65 about (90/20 - 36/20)65 = 54*65/20 = 175.5 km approximately 175 + 180 = 355 km approximately I do not feel like turning my calculator on. You can do it accurately.
August 30, 2016

Math
1 gallon (12 miles/0.3 gal) = 120/3 = 40 miles
August 30, 2016

Math
You are welcome.
August 30, 2016

Math
k^10 v^13
August 30, 2016

History
yes
August 30, 2016

Math
4,020,561,340 add 0*10^0 4*10^1 3*10^2 1*10^3 6*10^4 5*10^5 0*10^6 2*10^7 0*10^8 4*10^9 :)
August 30, 2016

History
I would vote for the riches :) He was quite sure the world was round as were most navigators but he far underestimated the diameter and therefore thought he was in the East Indies when in fact he was in the West Indies :)
August 30, 2016

Science
All correct.
August 30, 2016

Math
60 person days/job (1/60) job/person day (1/60)job/person day *(4) persons = 4/60 job/day = 1/15 job/day so 15 days
August 30, 2016

math homework
5^2 + 12^2 + 9^2 = 250 length = sqrt 250 = 5 sqrt 10 so (1 / 5sqrt10) (-5,-12,9)
August 30, 2016

typo, please check what youi posted
-9, 12, 21 You have a typo Please proofread before you post http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
August 30, 2016

Physics
time outbound = d/48 time back = d/340 so d/48 + d/340 = 1.2 (.0208333 + .00294)d = 1.2 d = 50.5 meters
August 30, 2016

Math
q q * - n * - d * n q * - n :( - d :( d q * - n :( - d :( so 5/9
August 29, 2016

Math - Check please!
I agree you.
August 29, 2016

ALGEBRA
put these two points on a number line one is four to the left of zero and the other is 21 to the right of zero so the total distance between them is 21 + 4 = 25 or write 21 - (-4) = 21 + 4 = 25
August 29, 2016

physics
Xa = -5.3 + 8.1 t Xb = 4.7 - 7.8 t so when they meet Xa=Xb -5.3 + 8.1 t = 4.7 - 7.8 t 15.9 t = 10 so t = 10/15.9 then Xa = x for example = -5.3 + 8.1(10/15.9)
August 29, 2016

Math
6*9 = 54 so -54 beads
August 29, 2016

Math
done that above, -54
August 29, 2016

Chemistry
Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
August 28, 2016

physics
What if the highway runs north-south?
August 28, 2016

typo
They have to tell you the mass.
August 28, 2016

PHYSICS
He ends up going 200 meters west in 252 seconds. Therefore we an figure out his west velocity component: Vw = 200/252 m/s Meanwhile he is carried south at .5 m/s so he will have to have a north component of Vn = .5 m/s So we can figure the angle north of west he has to head. ...
August 28, 2016

physics
weight down = 8 * 9.81 T up so m = hanging mass m a = F 8 a = 8*9.81 - T and top mass T = 5 a so 8 a = 8*9.81 - 5 a 3a = 8*9.81 a = 8 * 9.81/3 T = 5 * 8 * 9.81
August 28, 2016

physics
a = -3 m/s^2 v = Vi + a t at stop 0 = 20 - 3 t t = 20/3 (they should have started at 21 m/s) d = Vi t + (1/2) a t^2 d = 20 (20/3) - 3/2 (20^2/3^2) = 20^2/3 - 20^2/6 = 20^2/6 = 400/6 = 200/3 or easy way for second half is average speed during stop = 10 10 (20/3) = 200/3
August 28, 2016

Maths
y = 2x+8 y = 50 - x so 2x+8 = 50-x 3x=42 x = 14 y=36
August 27, 2016

Math
huh? (y2-y1) = -5-3 = -8 (x2-x1) = -2 +10 = 8 so slope = -8/8 = -1 so y = -1 x + b use either point now 3 = -1(-10) + b b = -7 so I get y = -x -7 ================ check that with the other point -5 = 2 -7 sure enough
August 27, 2016

physics
a = change in velocity/change in time = 495/1.78 m/s^2 braking is opposite velocity a = -495/2.16 m/s^2 note the acceleration of gravity is about 10 m/s^2 so this is more than 25 g,scary.
August 27, 2016

Chemistry
Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
August 27, 2016

physics
weight = normal force = m g = 50 * 9.81 Newtons static force = .4 * 50 * 9.81 moving force = .3 * 50 * 9.81 assume use entire static force or it will not accelerate .1*50*9.81 = m a = 50 a so a = .981 m/s^2 v = a t = .981 * 5
August 27, 2016

physics
g = 9.81 m/s^2 v = Vi - g t at top v = 0 t = 25/9.81 seconds to top double that for time in air m g h = (1/2) m Vi^2 h = 625/(2*9.81) v is 0 at top of course a is -9.81 m/s^2 forever until it hits the mud.
August 27, 2016

Computer Applications
maybe something like this: n = 101 sum = 101 1 if n = 199 quit n = n+2 sum = sum + n go back to 1 quit ---> print the sum and end
August 27, 2016

physics
In the Google search engine input: 40 mph = km/h You will find 64.3738 km/h which is 62373.8 meters/h which is 62373.8 meters/h (1 h/60 min) in meters/min times 3 for 3 minutes 64.3738 km/h * 1 h/3600 s) * t = 1 km so t = 3600/64.3738 seconds
August 27, 2016

Physics. Pleaseee helpppp
calculate the potential energy in the center 4 k 2 Qe^2/half diagonal^2 then calculate it at the center of a side 2 k 2 Qe^2/ half side^2 + 2 k 2 Qe^2/diagonal^2 the difference in potential energy is the work done
August 27, 2016

Physics
short answer: 40% above water 60% below water :) long answer: volume of wood = 60 kg (1 m^3/600kg) = 0.1 m^3 volume of wood under water (see Archimedes) = 60 kg (1 m^3/1000kg) = 0.06 m^3
August 27, 2016

Science
step by step do [sqrt(16+9)]^2 = 5 sqrt(25+144) = sqrt(169) =13 or simply sqrt (16+9+144)
August 27, 2016

math
half length of diagonal = 8 look at B to center of that diagonal now have 8, 6, 10 right triangle area of that triangle = (1/2)8 *6 there are 4 of those trianges on the rhombus 16 * 6 = 96 or half product of diagonals (1/2)(16*12) = 96
August 27, 2016

math
http://www.wikihow.com/Calculate-the-Area-of-a-Rhombus
August 27, 2016

Chemistry
Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
August 26, 2016

math
make a list take differences ---- 71 ** 16 87 ** 16 98 ** 16 110 the differences are all 16 71-16 is the answer :) 55
August 26, 2016

Algebra
It is a straight line when y = 0, x = 8 so put a dot on the x axis at x = 8 when x = 0, y = -8/5 = - 1.6 so put a dot on the y axis at y =-1.6 Draw a straight line through those two dots. The end
August 26, 2016

MATH HELP
|-3| = 3 |+3| = 3 so two numbers on a number line have the same absolute value , |-3| and |+3|
August 26, 2016

Physics
d = (1/2) g t^2 = 4.9 t^2 at t = 0, d = 0 at t = 1, d = 4.9 at t = 2, d = 4.9*4 at t = 3, d = 4.9 * 9 so from t = 1 to t = 3 it falls 4.9 (9-1) = 4.9*5
August 26, 2016

Math
60 = 10*6 = 5*12 12-5 = 7 remarkable
August 26, 2016

Algebra
(x-1)^2+(y-2)^2 = r^2 (-4-1)^2 + (-3-2)^2 = r^2 that should get you under way.
August 26, 2016

Algebra
I told you all but B and E Make sure you understand C, how to express a repeating decimal as a ratio of whole numbers (rational) using infinite geometric sequence.
August 26, 2016

Algebra
any number with pi in it is not rational. any number with sqrt 7 in it or sqrt 2 in it is not rational all the others can be expressed as a ratio of whole numbers. 13/1 3.454545454545..... = 3 + 45/100 + 45/10,000 + 45/ 1,000,000 etc = 3 + 45/100 + 1/100 (45/100)+ 1/100^2 (45/...
August 26, 2016

Geomentry
5526316/10,000,000
August 26, 2016

english
her wrist weighs 100 pounds???? LOL
August 26, 2016

Physics
you need to know how many cm of rain fell and the area of the city. 1 cm^3 = 10^-3 kg = 10^-6 tons need depth of water in cm * area of city in cm^2 to get volume in cm^3 multiply that by 10^-6 to get tons.
August 26, 2016

math
do you mean? | 3 7 8 | | 2 2 6 | | 7 9 3 |-| 6 7 8 | | 7 9 9 | | 5 8 6 | is | 1 5 2 | | 1 2-5 | | 2 1 3 |
August 26, 2016

math
hey, I did the one above.
August 26, 2016

math
That comes out 4,34/3,26 so I think you gave me another typo.
August 26, 2016

math
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
August 26, 2016

math
1/6 x = 1/8 y - z = -24 assume you mean 1/6 x + 1/8 y - z = -24
August 26, 2016

math
3 5 seems pretty obvious
August 26, 2016

math
a) 12 * 250 = b) 12 * 250 * 100 / 22,000 =
August 26, 2016

12th grade physics
1000cos[ sin^-1 (15/40) ] or 1000 [ sqrt(1600-225)]/40
August 26, 2016

Social Studies (Check Answers) Last Time
14 I disagree with you.
August 25, 2016

Pre-calculus
vertex at point (v,v) axis parallel to x, opening right (y-v)^2 = 4a(x-v) so (-2-v)^2 = 4 a (6-v) and ( 4-v)^2 = 4 a (3-v) ======================now plug and chug 4 + 4v + v^2 = 24 a - 4 a v 16- 8v + v^2 = 12 a - 4 a v ----------------------------- -12 +12v = 12 a or a = v-1 4...
August 25, 2016

Calculus
dV = surface area * dr for a sphere dV = 4 pi r^2 dr dV/dt = 4 pi r^2 dr/dt 5 = 4 pi r^2 (3) r^2 = 5/(12 pi)
August 25, 2016

METRIC CONVERSION
0.86 http://www.google.com/search?q=8.6+dm+meters&ie=utf-8&oe=utf-8
August 25, 2016

Algebra check answers
Choose the best definition for the following term: variable A. A letter that holds the place for some unknown value in mathematics*** Yes Question 2 Choose the best definition for the following term: substitution C. A process where if two things are equal, one can be put in ...
August 25, 2016

World history.
I vote for c. but miss e. it had tax collectors and slave drivers
August 25, 2016

physics
potential energy at top = kinetic energy at bottom m g h = (1/2)m v^2 so h = v^2/(2g) = 225/(2*9.81) about 11 meters
August 25, 2016

Algebra
yes, the second number has to be -1 :)
August 25, 2016

Physics
m = spaceship mass = 3.3*10^5 M = asteroid mass = 8.7*10^17 R = 7,300,000 m = 7.3*10^6 meters F = m a = m v^2/R F = G m M/R^2 + k |Q1| |Q2|/R^2 (both forces +, attraction) so v^2 = G M/R + k |Q1| |Q2|/(m R)
August 25, 2016

math
yes, distributive properrty
August 25, 2016

MATH
(11+x)/(15+x) = 7/8 88 + 8 x = 105 + 7 x x = 17
August 25, 2016

?
How did you go from 134.05 hp to 13.05 hp ?
August 25, 2016

ALG 2
It said the length was twice, not half.
August 25, 2016

ALG 2
4*9 = 36 so garden length is 9 so n = 4.5
August 25, 2016

Math
∫cos^6 x dx note: ∫cos^n dx=[cos^(n-1)x /n sin x]+(n-1)/n ∫cos^(n-2)x dx and ∫cos^2 x dx = x/2 + sin 2x /4
August 25, 2016

SOUND
compression wave in material
August 25, 2016

Maths
draw triangle center to bisect chord. draw altitude from circle center of to chord center. right triangle legs 5 and 4, hypotenuse is radius sqrt (25 + 16) = sqrt(41)
August 25, 2016

math
30*6.50 = 195 300 - 195 = 105 needed in tips 105 = .20 * x x = 525
August 24, 2016

Math
j = b - 2 b = .5 m so j = .5 m - 2 m = 2 b b = j + 2 etc etc etc
August 24, 2016

PHYSICS
huh? circumference = 2 pi R
August 24, 2016

Math
You are welcome.
August 24, 2016

Math
3^3 = 27 (x^4)^3 = x^12 so 27 x^12 y^3
August 24, 2016

math
n-1 , n , n+1 n+1 = .5 (n-1) + 2 I guess, English not clear n+1 = .5 n - .5 + 2 .5 n = .5 n = 1 so 0 , 1 , 2
August 24, 2016

math
If you subtract nothing from twenty you still have twenty.
August 24, 2016

physics vectors
x direction: 6 a - 8 b + 25 = 0 y direction: -8 a + 3 b + 22 = 0 ========================== 24 a - 32 b + 100 = 0 -24 a + 9 b + 66 = 0 -------------------------add - 23 b + 166 = 0 b = 7.22 a = 5.46 check my arithmetic !
August 24, 2016

MATH
LOL, yes :) good
August 24, 2016

MATH
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html Xn = a +(n-1)d 96 = a + 13 d 173 = a + 24 d --------------- -77 = -11 d d = 7 then a = 96 - 13*7 = 5 so X19 = 5 + 18*7 = 131 etc
August 24, 2016

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