Friday

February 12, 2016
Total # Posts: 25,219

**Precalculus**

try 3) (1/3)^(3x+5)=(9)^(8-x) (3x+5) log .333333333 = (8-x) log 9 (3x+5)(-.4771) = (8-x) (.9542) (3x+5) = (x-8) 2 that was lucky :) 3 x + 5 = 2x-16 x = -21 agree ===================== or this way (1/3)^(3x+5)=(9)^(8-x) 1^(3x+5)/3^(3x+5) = 3^(16-2x) 1 = 3^(x+21) x+21 = 0 x = -21
*December 1, 2015*

**Precalculus**

1) for example: log5 (14) = 2x-9 5^[log5 (14)] = 14 = 5^(2x-9) so the question is 5 to the what = 14 ? say 5^z = 14 (we know that z is (2x-9)) z log 5 = log 14 using base 10 logs (or e or whatever, I use base 10) z = log14/log5 = 1.146 / .699 = 1.64 so 2x-9 = 1.64 2x = 10.64 x...
*December 1, 2015*

**Precalculus**

so did you try?
*December 1, 2015*

**Physics**

acceleration = (final velocity - initial velocity)/change in time a = (0 - 40) m/s /20 s a = - 2 m/s^2 F = m a F = 1000(-2) = -2000 Newtons
*December 1, 2015*

**Physics**

u = horizontal component = 19.5 cos 30.6 = 16.8 m/s the whole time so time in air = 28/16.8 = 1.67 seconds What is vertical component? Vi = 19.5 sin 30.6 = 9.93 m/s but v = Vi - g t v = 9.93 - 9.81(1.67) v = -6.46 m/s headed down total speed = sqrt (16.8^2+6.46^2) = 18 m/s
*December 1, 2015*

**Pre Calc**

If A is in quadrant 3, then 2 A is in quadrant 1 or 2 5^2 + 12^2 = 169 = 13^3 so sin A = -5/13 and cos A = -12/13 cos 2A = cos^2 A - sin^2 A = (144 - 25)/169 = 119/169
*December 1, 2015*

**Math**

well, you can take 3 out 3 (2 m - 7 p) not much else to do
*December 1, 2015*

**Math**

circumference = 2 pi r = 188.5 feet 188.5 feet ( 1 second/ 3.6 feet) = 52.4 seconds
*December 1, 2015*

**SS**

Well, it is not two islands but two sections of one island. If it were two islands the problem might be easier to resolve.
*December 1, 2015*

**SS**

Oh my :( try http://www.aljazeera.com/indepth/interactive/2014/07/cyprus-future-unity-division-20147198124976694.html
*December 1, 2015*

**Algebra**

(y -2)/(x-5) = 3 y-2 = 3 (x-5)
*December 1, 2015*

**Math**

passes through I assume. slope of A = (-1 +13) / (1+5) = 12/6 = 2 y = 2 x + b put either point in to find b so slope of B = -1/slope of A = -1/2 so 5 = -(1/2)(6) + b 5 = -3 + b b = 8 so y = -x/2 + 8 2 y = -x + 16
*December 1, 2015*

**Physics**

Hey look, sketch these questions out on a graph.
*December 1, 2015*

**Physics**

I just answered this a few minutes ago.
*December 1, 2015*

**Algebra 1- Last question, PLEASE HELP!**

I am not going to do this for you. You can use : http://www.wolframalpha.com/input/?i=linear+regression&a=*C.linear+regression-_*Calculator.dflt-&f2={104%2C+117%2C+131%2C+145%2C+160%2C+171}&f=LinearFitCalculator.data\u005f{104%2C+117%2C+131%2C+145%2C+160%2C+171}&a=*FVarOpt-_**...
*December 1, 2015*

**Maths**

A/B = 3.33/6.67 1/B = 3.33/6.67 B = 6.67/3.33 = 2
*December 1, 2015*

**Physics**

velocity = change in position/change in time = slope of position time graph. If the slope is negative, the velocity is negative why not? constant y, going right or left why not? constant x, going up or down
*December 1, 2015*

**Algebra 1- Please help whenever you get the chance**

(6-2)/(9-7) = 4/2 = 2 yes d (-9+4)/(6-3) = -5/3 so I think b
*December 1, 2015*

**Physics**

1) positive V = dX/dt = slope of position time curve 2) negative is negative period !
*December 1, 2015*

**Chemistry**

Fr+ is positively charged and has one atom
*December 1, 2015*

**High School Paliganj**

If you are only looking at tangential acceleration (not centripetal) then only tangential velocity matters v = 4 t cm/s * 1 m/100 cm = .04 t m/s tangential acceleration = dv/dt = .04 m/s^2
*December 1, 2015*

**Algebra 1**

Ah, hmmmm 1/46 is hours/mile but 46/1 is miles/hour which is a unit rate. B and C are really the same, but I think B is the answer they want
*December 1, 2015*

**History**

2. Well yes but keep in mind: http://www.history.com/this-day-in-history/fdr-wins-unprecedented-fourth-term ".....Up to that time, presidents had either voluntarily followed George Washington’s example of serving a maximum of two terms, or were unsuccessful in ...
*December 1, 2015*

**Math**

I got 1385 so c
*December 1, 2015*

**Math**

pi d = 50 mm d = 15.915 mm agree 16 mm pi d^2/4 = pi (42)^2/4 = 1385 mm^2 I disagree with you here
*December 1, 2015*

**Math**

.35 * 215 = ?
*December 1, 2015*

**Comm Tech**

You only listed one with brown hair. That is number 4 However you seem to be missing one
*December 1, 2015*

**Comm Tech**

I believe so but not really my thing.
*December 1, 2015*

**physics**

The mass is irrelevant (1/2) m v^2 = m g h note mass cancels h = (1/2) v^2 / g = 3.347 = 3.35 meters correct
*December 1, 2015*

**Binalbagan, math**

5x - 3x = 24 2 x = 24 x = 12 5 x = 60 3 x = 36 so 60 and 36
*December 1, 2015*

**geometry**

scale ratio = 100 mm / 1 mm = 100/1
*December 1, 2015*

**math**

120 ft * (1 unit/ft) = 120 units 75 ft * (1 unit/ft) = 75 units
*December 1, 2015*

**Math**

64 * (1/2)^x = 1 2^x = 64 x = 6 It goes like this 64/2 = 32 32/2 = 16 16/2 = 8 8/2 = 4 4/2 = 2 2/2 = 1 so after n rounds teams left = 64 * (1/2)^n
*December 1, 2015*

**physics**

force on side walls = p halfway up * area of walls = (rho g h/2) pi d h force on bottom = rho g h (pi d^2/4) so 2 rho g h^2 pi d = rho g h pi d^2 2 h = d h = d/2
*December 1, 2015*

**Math**

well, a bedroom is likely to be around 12 feet long if you make it 1 in/2 ft then the model length will be 12 ft (1 in/2 ft) = 6 inches long (reasonable) if you make it 1 in/12 ft then 12 ft (1 in/12 ft) = 1 inch (kind of tiny to work with)
*November 30, 2015*

**Math**

3 times as wide so 3 times as long 18 inches
*November 30, 2015*

**Math**

36000+.015 s = 32000 + .020 s .005 s = 4000 s = 800,000
*November 30, 2015*

**PreCalculas**

16,000 (.8)^3 = 8192 2^5 = 32
*November 30, 2015*

**Physics**

at t = 0 v = 6 k momentum = (7.08*6) k now to get angular momentum we need a center I omega = m V cross R = m V x R it is at the center (R=0) so its angular momentum about the center is zero.
*November 30, 2015*

**algebraic**

let k = baseball cards/friend let x = number of friends let y = total number of cards then y = k x or y = 32 * 4 = 128
*November 30, 2015*

**math**

4/5 q3 = 4 so q3 = 5 4/3 q1 = 4 so q1 = 3 5+3+4 = 12 million
*November 30, 2015*

**physics**

normal force = m g cos 30 friction force up ramp = mu m g cos 30 gravity force component down ramp = m g sin 30 so m g sin 30 - mu m g cos 30 = m (1.25) mu = (g sin 30 - 1.25)/(g cos 30)
*November 30, 2015*

**geometry**

Try is with a line segment on your desk and use your fingers for a compass.
*November 30, 2015*

**geometry**

Oh come on cassie. Try it! If the opening does not reach halfway, no way you can swing it off to the side and get the swings from both ends to intersect!
*November 30, 2015*

**algebraic**

number of gallons * dollars/gallon = dollars 20 gal * (1.6 $/1 gal) = 32 $
*November 30, 2015*

**Do not do magic**

No figure here, hiding behind curtain?
*November 30, 2015*

**Math Ms Sue please help me**

You are welcome.
*November 30, 2015*

**Math Ms Sue please help me**

perpendicular to x = 4 is y = some constant (sketch it) That constant is 6 y = 6
*November 30, 2015*

**geometry**

ANGLE ABC, center at B swing compass radius R (any R) around B to make a circle of radius R around B now put the point of your compass on C and the pencil of it on A. Get distance x between point and pencil move point of compass to A. label point where compass pencil crosses ...
*November 30, 2015*

**physics**

It crossed home plate horizontally ? - clever vertical plane curve ball :) before: Vx = 42 momentumx = Px = .141*42 = 5.922 kg m/s after: Vx = -50 momentum = Px = -.141*50 = -7.05 kg m/s impulse = change of momentum = -7.05-5.922 = - 12.972 kg m/s so 13 kg m/s (part A) force...
*November 30, 2015*

**Math**

The important thing is that your conversion factor has to be the same top and bottom although in different units 60 min IS 1 hour so 60 min/1 hour is the same numerator and denominator
*November 30, 2015*

**error repair**

60,000 min (1 hour/60 min) = 1,000 hours do units so the ones you do not want cancel Here I used 1 hr/60 min so min cancelled If I had hours and wanted minutes I would multiply by ( 60 min/1 hour ) This is easy when you only have one conversion but when you get to Chemistry ...
*November 30, 2015*

**Math**

60,000 min (1 hour/60 min) = 1,000 min do units so the ones you do not want cancel Here I used 1 hr/0 min so min cancelled If I had hours and wanted minutes I would multiply by ( 60 min/1 hour ) This is easy when you only have one conversion but when you get to Chemistry and ...
*November 30, 2015*

**Math**

You are welcome.
*November 30, 2015*

**Math**

ah well, so much for Singapore math :) 6 pm - 6 = noon we need to go back 3 3/4 more noon - 3 = 9 am we need to go back 3/4 more 9 am - 3/4 hour = 8:15
*November 30, 2015*

**Math**

4 hours after 11 am is 3 pm so 3:05 pm 6 pm end time one way is to say that 6 pm = 6+12=18 am (that is regrouping. It is also military time :) 18 am - 10 + 1/4 also regrouped 9 3/4 into 10 - 1/4 and 18 - (10-1/4) = 18 - 10 + 1/4 so 8 and 1/4 = 8:15 am
*November 30, 2015*

**PreCalculas help**

an = a r^(n-1) = 50,000 (1.05)^(n-1) a5 = 50,000 (1.05)^4 = 60,775.31 sum 1 to 10 = a (1-r^n)/(1-r) = 50,000 (1-1.05^10)/(-.05) = 50,000 ( -.6289 / -.05) = 628,894.63
*November 30, 2015*

**math Help plz**

an = a1 r^(n-1) = 6 * (2/3)^(n-1) = 6 * 2(n-1) /3^(n-1)
*November 30, 2015*

**math Help plz**

Plug and chug: http://www.mathsisfun.com/algebra/sequences-sums-geometric.html
*November 30, 2015*

**Algebra 2**

They do not say what flavor so I assume any How can I have 4 different toppings and also have 10 different toppings? I think if your answers are wrong it might be because the question is messed up.
*November 30, 2015*

**math**

200 miles/5 inches = 40 miles/inch scale ratio 40 miles/inch * 7 inches = 280 miles miles on earth = inches on chart * scale ratio
*November 30, 2015*

**Physics Check my work please**

If it is horizontal and you pull it .3 m to the right then the potential energy is (1/2) k(.3)^2 = (1/2)(40)(.09) = 1.8 Joules The work done by the spring is indeed the change in potential energy in going from .3 m back to .1 meters stretch (thee work appears as kietic energy ...
*November 30, 2015*

**?**

I saw this but do not have the picture. Is this vertical or horizontal? Is the equilibrium position .1 metert of stretch? Final when? Does it not oscillate? Change of U when you do what? Work done by spring during what motion?
*November 30, 2015*

**Physcial Science**

I suspect that at 0 C you had water and ice, solid and liquid. The temperature should stay at the melting point, 0 C, until all the ice is melted. That is why ice is used in drinks. If the water goes up above 0 C, the ice will use the heat to melt ice and bring it back down to...
*November 30, 2015*

**Physics**

Power is the product of voltage and current but resistance loss in the transmission wire is due to current (i^2*R). To minimize power loss due to wire resistance, use high voltage and low current. However high voltage is dangerous in a home or business. Therefore a step up ...
*November 30, 2015*

**PHYSICS !!!**

rate is proportional to area and inversely proportional to length 4 * 10*-11 kg/s = k * .5cm^2 /.22 k = 1.76 * 10^-11 rate = 1.76*10^-11*.3/.1 = 5.28 * 10^-11 kg/s
*November 30, 2015*

**Physics**

Move the wire over the magnet or move the magnet over the wire :)
*November 30, 2015*

**Science...anyone?**

agree
*November 30, 2015*

**Spanish**

Yes, ice cream is an unusual main course.
*November 30, 2015*

**History**

well, I assume C was "deliver babies". If so then C
*November 30, 2015*

**Spanish**

Yes.
*November 30, 2015*

**Math Test**

You are welcome.
*November 30, 2015*

**Math Test**

1. C=0.20m+150.00 IS the function rule 2. wrong sign 3. right 4. there are two different y values at x = -8. Thus it is NOT a function 5. Sure, horizontal line y = -7
*November 30, 2015*

**math**

You are welcome.
*November 30, 2015*

**math**

mark (0 , -4) now go right 4 and up 1 you are at (4,-3) so mark that point draw the line
*November 30, 2015*

**Hard to say**

I can not see the figures.
*November 30, 2015*

**History**

This you HAVE to know !!! Also memorize the FOURTH
*November 30, 2015*

**History**

FIRST
*November 30, 2015*

**History**

What? It is the First , A.
*November 30, 2015*

**History**

.....or the freedom of speech or of the press or the right of the people peaceably to assemble and ... FIRST Amendment !!!!
*November 30, 2015*

**Math**

sqrt (x-3) is real only to the right of x=3 so try -1/sqrt(x-3)
*November 30, 2015*

**Calculus III**

well, polar I suppose since there is no z r^2(cos^2 T -sin^2 T) = 36 r^2 (cos 2 T ) = 36
*November 30, 2015*

**History**

Yes, B
*November 30, 2015*

**Geometry**

not if they are distinct lines in a plane. not that I know of unless they are the same plane in three dimensional space.
*November 30, 2015*

**Math**

six ten thousandths twenty eight ten thoundths
*November 30, 2015*

**History**

D yes
*November 30, 2015*

**Math ?**

I don't get it. Are i and j unit vectors or is i (-1)^.5 ?
*November 30, 2015*

**Physics ._.**

well, I will try to do dimensional analysis because I have no idea. constant * cross sectional area inversely proportional to length 1 hr = 3600 s 4.1 cm^2* 1m^2/10^4 cm^2 = 4.1*10^-4 m^2 Q = k * A/L * delta c * time try Q = 1.24*10^-9 m^2/s * 4.1*10^-4 m^2 /.0106 m * 1.37 kg/...
*November 30, 2015*

**History**

Yes, C
*November 30, 2015*

**Science**

The only reason we always see the man in the moon is that the moon spins around its own axis at exactly the period it revolves in its orbit around earth. Any other period of rotation would let us see the dark side of the moon :) Try it with a tennis ball and a table lamp :)
*November 30, 2015*

**Math**

You are welcome.
*November 30, 2015*

**Math**

log z + log y^2 - log x^3 = log [ z y^2 / x^3 ] = log [ z y^2 x^-3 ]
*November 30, 2015*

**History**

Yes, 3/5 of a person per slave. (but of course the slave was not allowed to cast even 3/5 of a ballot)
*November 30, 2015*

**History**

You won again :)
*November 30, 2015*

**History**

You are
*November 30, 2015*

**History**

No, the question is about the Articles and their weakness.
*November 30, 2015*

**History**

Well your mom picked the Constitution but you picked the Articles of Confederation
*November 30, 2015*

**math**

As I said, you can not solve for x, y and z with two equations
*November 30, 2015*

**History**

That is from http://www.history.org/foundation/journal/Winter15/barbary.cfm You are welcome. I am from a New England seaport so am touchy on this subject.
*November 30, 2015*

**History**

Naturally, British protection for American ships ended with independence. It took little time for the pirates to renew their attacks on United States' merchantmen. The new nation could do little to stop them. New Hampshire Congressman Pierse Long accurately described the ...
*November 30, 2015*