Monday

October 20, 2014

October 20, 2014

Total # Posts: 457

**Math**

This type of problem involves a lot of trig idenities, I just looked them up.. Lets look at the LHS: csc^2(x)= 1/sin^2(x) cos^2(x) = 1-sin^2(x) Now we can say: csc^2(x)*cos^2(x) = (1-sin^2(x))/sin^2(x) now lets look at the RHS: csc^2(x) = 1/sin^2(x) and we can change that 1 to...
*October 20, 2014*

**physics**

Note that "r" and "g" cancels out when you put the coefficient of friction equal to each other for car A and car B
*October 20, 2014*

**physics**

Coefficient of friction is: u=v^2/(r*g) now lets apply this formula to the problem Set Car A = Car B and you get V_a^2/V_b^2 = u_a/u_b v_b=v_a*sqrt(u_b/u_a) (13.8)*sqrt(.843/.333) = 21.95 m/s
*October 20, 2014*

**TYPO**

Made a small typo.. Answer is y+9 =(7/8)*(x+2)
*October 20, 2014*

**Jay**

Yeah
*October 20, 2014*

**Jay**

Point slope form is y-y1 = m(x-x1) y-(-9) = (2/7)*(x-(-2)) y+9 =(2/7)*(x+2)
*October 20, 2014*

**Algebra**

You gotta make the graph, use those points.
*October 20, 2014*

**Algebra**

x coordinate can be all negative # and zero y can only be all negative # so make a t chart x=0,-1,-2,-3,-4,-5……. y=-1,-2,-3,-4,-5,-6….
*October 20, 2014*

**physics**

Was velocity given in the figure?
*October 20, 2014*

**MISTAKE**

Oops, I made a mistake.. (4500*.04)+(.1*x)=1000
*October 20, 2014*

**algebra**

Set this up as an equation. (4500*.1)+(.1*x)=1000 solve for x to get your answer.
*October 20, 2014*

**Algebra**

Well, rate of change = slope deltaY/deltX = slope deltaY = (y2-y1) deltaX =(x2-x1) For the year 1990-1992: deltaY = (55-52) = 3 deltaX =(1992-1990) = 2 3/2 = 1.5=slope So basically, you have to pick 2 years where deltaY > 3 deltaY <= 2 so the only years that meet those ...
*October 18, 2014*

**physics**

Sorry, I made an error… Vector A has both an x and y component: Fx=10cos25=9.06 Fy=10sin25=4.266 Magnitude of A = sqrt(9.06^2+4.266^2) = 10.0141 Vector B only has x components: Fx=8 Magnitude of B = 8 10.0141*8 = 80.112
*October 18, 2014*

**physics**

If I'm reading this correctly, the question wants you to find the magnitude of vector A and then multiply it to magnitude of vector B. If that's the case then… Vector A has both an x and y component: Fx=10cos25=9.06 Fy=10sin25=4.266 Magnitude of A = sqrt(9.06^2+4....
*October 18, 2014*

**Intermediate Algebra**

find the average of hours of homework completion. (6+9)/2 = 7.5 hours
*October 18, 2014*

**Trigonometry**

sin^-1(12/13) = 67.38 180-67.39 = 112.62 = A sin^-1(-7/25) = -16.26 = B Tan ( A - B) = ??? I think that's how you approach it.. someone verify please?
*October 15, 2014*

**math**

4+x+2=9
*October 15, 2014*

**math**

1/(8000*450) = 2.77*10^-7
*October 15, 2014*

**math**

Wait it's 2x+5=-c
*October 15, 2014*

**math**

I agree with your answer.
*October 15, 2014*

**Algebra 2 (PLEASE, HELP ME!)**

I think for part C: match a t chart for x and y for the light weight, x can be anything bigger than 200 and lower than 230 so x can be 200 all the way to 229 Now do the same for the heavy weight class then plot them. for part D: It's asking at what point the lines ...
*October 15, 2014*

**algebra**

Hmm.. lets start with the polynomial (x+13)(-x+12) = -x^2 - x + 156 part b) The discriminant is everything inside the square root of the quadratic formula 150= -x^2 - x + 156 -x^2-x+6 a=1 b=-1 c=6 so: b^2-4*a*c is the discriminant -1^2 - 4*-1* 6 = 25 and 25 > 0 part c) Just...
*October 15, 2014*

**Physics**

Kinetic energy + Potential Energy (1/2) *m*vf^2 + (1/2)*m*vi^2 = mgh m=mass but we we really don't need the mass to figure this problem out since we can factor it out of the equation Now isolate the vf vf = sqrt(2*g*h - vi^2) g=9.81 h=30 vi=45 vf=sqrt(2*9.81*30 - 45^2) vf=...
*October 15, 2014*

**Math**

97 rounded to nearest ten gives 100 97 rounded to nearest hundred gives 100 118 rounded to nearest ten gives 120 118 rounded to nearest hunted gives 100 5 rounds to nearest ten is 10 179 rounded to nearest ten gives 180 179 rounded to nearest hundred gives 200 5091 rounded to...
*October 15, 2014*

**physics**

if you still need this i'll take a shot at it.. I drew this a free body diagram of this You should get a triangle when you do this where 228 is your hypothenuse is 228 so the formula to to find the missing side is c^2=a^2+c^2 where c=228 and a=50 so the missing side b = ...
*October 15, 2014*

**math**

x=semir y=sarah z=sung semir sold 3 times as many meals as sarah x=3*y sung sold 2 more meals than sarah. z=2+y y=y so 3*y + y + (2+y) = meals sold you can simplify more 3y+2y+2
*October 14, 2014*

**Math**

I set up as an equation: (1/2)*x*3 = 324 solving for x will give you the total cost of the three pairs of shoes x=208 324-216 = 108 hand bag is $108
*October 14, 2014*

**Pre-Cal**

It mean's that the college of nursing students doesn't have to take statistics
*October 14, 2014*

**physics**

F=ma F=Force m=mass a=acceration F/m = a 3.25/3.8 = .855m/s^2 a=.855 m/s^2 now we have to find velocity at given time a*t=v .855*16.5 = 14.11 m/s now momentum formula p=m*v p=momentum m=mass v=velocity p=3.8*14.11 = 53.616 Ns Someone check my work.
*October 14, 2014*

**math**

Or if it's written (7 * 4) - (4/2) = 26 then its correct.. Actually, I think this post is the one you should look at
*October 13, 2014*

**math**

(7 x 4 - 4)/2 = 26 PEMDAS Do calculations in the parenthesis first: 24/2 = 26 Do you think that's true or false?
*October 13, 2014*

**Math**

C probably.
*October 13, 2014*

**Algebra 2**

should get a diagonal line
*October 13, 2014*

**Algebra 2**

Make a t chart and plug in an initial x to get your y to get your points then graph. for example: pick 1 for x as your starting y=|1|/2 - 3/4 y=-1/4 so first points are x=1 y=-1/4 x=2 y=??? x=3 y=??? so on..
*October 13, 2014*

**Math**

surface arena of a cone: A=pi*r(r+sqrt(h^2+r^2)) where r=radius Given: A= 258 cm^2 r=4 cm find h 258=(3.14*4)(4+sqrt(h^2+4^2)) 258=12.56(4+sqrt(h^2+16)) 258/12.56 = 4+sqrt(h^2+16) 16.54 = sqrt(h^2+16) square both sides 274.233 = h^2 + 16 258.233 = h^2 h=16.0696
*October 13, 2014*

**pre cal**

circumference of a circle: C=2*pi*r where r=radius=27/2=13.5ft pi=3.14 C=84.78 It's making 2 rotations every 2 seconds or in other words, 1 rotation every 1 second. note its asking for mph: 1hour=3600 12inch=1foot 1mile=5280 Formula to solve this: (n*C*3600)/(12*5280) ...
*October 13, 2014*

**math**

There are 75 employees, and they all get 2 weeks off per year, so total weeks off for everyone is: 75*2 = 150 weeks Now: 1 year = 52.18 weeks The total weeks that all 75 employees work without the 2 week vacation is: 75*52.18 = 3913.5 Total week - vacation week=net working ...
*October 13, 2014*

**MATH 101**

Can't really factor anything out of this. (7 a - 3 b) (8 a + 9 b) If you FOIL: you get 56a^2+39ab-7b^2 I just kind of did trial and error.
*October 13, 2014*

**Math**

If you tried 1 2 3 4 and took the product you would get 24 which doesn't equal one of the above numbers, so this combination wouldn't be correct.
*October 13, 2014*

**Math**

Take a look at 0,1,2,3 Those are 4 consecutive numbers. Now lets take the product of them: 0 * 1 * 2 * 3 = 0 As you can see, it's equal to one of the integers which is 0 So that meets the requirement. From those set of numbers, 3 is the largest.
*October 13, 2014*

**Algebra**

Hmm.. Let's break this down with what is given. There is a total of 1065.95 total. Mary has 122 in the cash register initially. So subtract 1065.95 - 122 = 943.95 943.95 is the total items she sold including tax Let's Figure out that amount excluding the tax, which is ...
*October 13, 2014*

**Math**

x<= 2100-300p 600 <= 2100 -300p p<= 5
*October 12, 2014*

**Algebra 2**

ah okay, well it's really basic algebra then. Just isolate the h h=(3v)/(pi*r^2)
*October 12, 2014*

**Algebra 2**

So…. what's given and what does it ask you to solve for?
*October 12, 2014*

**Math**

A = 1, otherwise the product would have 5 digits. D = 9 because A = 1. B = 0 or 1, otherwise the product would have 5 digits. If B = 1, then C = 0, otherwise the product would have 5 digits. But 1109 * 9 = 9981, which isn't right. So B = 0. Then 9*D = 9*9 = 81, so 8 + 9*C ...
*October 12, 2014*

**sci207**

LOL, this is a funny question.
*October 12, 2014*

**Algebra**

Yes. You are correct. y=3x plug 1000 into x 3 * 1000 = 3000
*October 12, 2014*

**engineering science N4**

I feel like the weight of the steel block has to be given in order to solve this problem…
*October 12, 2014*

**maths**

I set this up as a polynomial x^2-64x+960 factor this (x - 40)(x-24) where you it's roots to be 40 and 24 so 40 + 24 = 64 40 * 24 = 960
*October 12, 2014*

**CHEMISTRY**

First find molar mass of C6H12O6: I found it to be 180.1566 g/mol now find the ratio of moles 5.85/180.1566 = .0325mol Molality of C6H12O6: (.0325*1000)/255 = .127 note: the value 1000 is from the density of water which is 1.00g/mL So freezing point: delta_T = -k_f * m k_f = 1...
*October 12, 2014*

**physics**

yeah you are right, ignore my post.
*October 12, 2014*

**physics**

Final Velocity of 2.2kg ball: Vf = (V_i *(m1-m2) + (2m2*v_i2)/(m1+m2) v_i =1.27 m1=2.20 m2=7.2 v_i2 = 0 (because it was a rest initially) Vf=(1.27*(2.2-7.2)+(2*7.2*0)/(1.27+7.2)) =-6.35 For final Velocity of 2nd object: Vf = (V_i2 *(m2-m1) + (2m1*v_i/(m1+m2) Vf=(0*(7.2-2.2)+(2...
*October 12, 2014*

**Science quick question urgent check my answer**

Spores form part of the life cycles of many plants, algae, fungi and protozoa. In bacteria, spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions. --Wikipedia
*October 1, 2014*

**Math**

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a previous study, the ...
*September 21, 2014*

**math **

you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?
*August 28, 2014*

**Math**

What do I do next after that?
*August 2, 2014*

**Math**

but i dont get the first one
*August 2, 2014*

**Math**

Simplify the following expressions by using trigonometric form and De Moivre's theorem a. (√3-i)^4 b. (-4+4i√3)^5 c.(2+3i)^4 d. (4-i)^6
*August 2, 2014*

**algebra**

A three quarter inch wire has 12 ohms resistance. How much resistance has the same length of half-inch wire, if resistance varies inversely as the square of the diameter?
*May 23, 2014*

**English**

What is a metaphor for a deep voice?
*May 22, 2014*

**Math homework help**

Check out the polar coordinate pairs that label the same point. Several pairs may be possible. A) (2, 2pi/3) B) (2, -pi/3) C) (-3, pi) D) (2, 7pi/3) E) (3,0) F) (-3,0) G) (-2, -pi/3) H) -3, 2pi)
*May 17, 2014*

**Algebra 1**

2+11b=8b+15
*November 4, 2013*

**DISCRETE MATHS**

Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).
*October 25, 2013*

**DISCRETE MATHS**

Use the Euclidean Algorithm to find gcd(112,15)
*October 4, 2013*

**DISCRETE MATHS**

What is the cardinality of this set? {p, {p}, {p, {p}}} my answer is 1. is it right?
*September 2, 2013*

**finance**

12.6% is the wrong answer. Try 8.5%
*July 15, 2013*

**pre-calculus**

Move point (3,50 degrees) according to the following symmetries (keep positive) a. symmetrical to the origin b. symmetrical to theta=0 degrees c. symmetrical to theta= 90 degrees
*June 2, 2013*

**stats please help ASAP!!!**

A. The GPAs of all 5540 students enrolled at a University have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Let x be the mean GPA of a random sample of 48 students selected from this University. Find the mean and standard deviation...
*May 17, 2013*

**MATHS STATISTICS(PLEASE HELP ANYONE!!**

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by adjusting the ...
*May 13, 2013*

**MATHS STATISTICS**

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by adjusting the ...
*May 13, 2013*

**MATHS STATISTICS**

A. According to an estimate, 50% of the people in the United States have atleast one credit card. If a random sample of 30 persons is selected, what is the probability that 19 of them has atleast one credit card? PLIZ REALLY NEED HELP!! THANKS VERY MUCH..
*May 13, 2013*

**linear algebra**

solve using gauss jordan 10y − 4z + w = 1 x + 4y − z + w = 2 3x + 2y + z + 2w = 5 −2x − 8y + 2z − 2w = −4 x − 6y + 3z = 1
*May 13, 2013*

**Math**

The local dinner offers a meal combination consisting of an appetizer, two soups, four main courses, and five desserts. Your diet retricts you to choosing between a dessert and an appetizer. (You cannot have both). Given this restriction, how many three-course meals are possible?
*May 6, 2013*

**mathURGENT!!!!!!!!!!**

if 4^(x)-4^(x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????
*April 20, 2013*

**mathURGENT!!!!!!!**

if (4^x)-(4^x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????
*April 20, 2013*

**Physics**

A loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.12 m. The normal to the plane of the loop is parallel to a constant magnetic field ( = 0°) of magnitude 0.85 T. What is the change ÄÖ in the ...
*April 8, 2013*

**Physics**

In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
*April 8, 2013*

**Physics**

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
*April 4, 2013*

**Physics**

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
*April 4, 2013*

**Physics**

A positively charged particle of mass 5.60 10-8 kg is traveling due east with a speed of 60 m/s and enters a 0.49-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.20 10-3 s, at which time it leaves the field heading due south. All ...
*April 4, 2013*

**Physics**

An electron has a kinetic energy of 7.00 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 4.40 10-5 T. Determine the radius of the path?
*April 4, 2013*

**Physics**

A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
*March 25, 2013*

**Physics**

A wire has a length of 5.40 10-2 m and is used to make a circular coil of one turn. There is a current of 2.30 A in the wire. In the presence of a 3.80-T magnetic field, what is the maximum torque that this coil can experience?
*March 25, 2013*

**Physics**

An á-particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.16 106 V and then enters a uniform magnetic field whose magnitude is 3.00 T. The á-particle moves perpendicular to the ...
*March 25, 2013*

**mathURGENT!!!!!!**

how did you get that ms sue?
*March 20, 2013*

**mathURGENT!!!!!!**

for which integers will the square of the integer decreased by twice the integer produce a difference of less than 4? please answer and explain how you got the answer...please????!!
*March 20, 2013*

**Physics**

If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
*March 17, 2013*

**Quantum Physics**

If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
*March 11, 2013*

**Quantum Physics**

a) If |u>= |v> = |+ >, what is the probability that the measurement outcome is 0 ? b) If |u> = |+ > and |v> = |-> , what is the probability that the measurement outcome is 0 ?
*March 11, 2013*

**mathURGENT!!!!!!**

what is the greatest value of m such that 25!/5^m is an integer? hint: the exclamation point means "factorial". 3!=3*2*1=6 4!=4*3*2*1=24 etc. please answer and explain how you got it!!!!please???
*March 8, 2013*

**MA111**

lim x!0 k + cosmx x2 = −4 . FIND M AND X?
*March 7, 2013*

**math**

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing.
*March 6, 2013*

**Maths**

How many ordered triples of positive integers (a,b,c) with 1<=a,b,c<=5 are there such that ax^2+bx+c has a rational solution?
*March 1, 2013*

**maths**

How many ordered triples of positive integers (a,b,c) with 1¡Üa,b,c¡Ü5 are there such that ax^2+bx+c has a rational solution?
*February 28, 2013*

**Probabilities**

A queen on an English chessboard is able to attack in the same row, column and diagonal. The probability that 2 randomly placed queens on an 8 by 8 chessboard will be able to attack each other can be expressed as a/b , where a and b are positive, coprime integers. What is the ...
*February 28, 2013*

**Physics**

The coil of wire in a galvanometer has a resistance of RC = 78.0 Ù. The galvanometer exhibits a full-scale deflection when the current through it is 0.440 mA. A resistor is connected in series with this combination so as to produce a voltmeter. The voltmeter is to have ...
*February 24, 2013*

**Physics**

In the drawing below, R1 has a resistance of 6.2 Ù and R2 has a resistance of 2.6-Ù. Determine the current (magnitude and direction) in the 6.2 and 2.6-Ù resistors in the drawing.
*February 24, 2013*

**Physics**

A battery has an internal resistance of 0.017 Ù and an emf of 9.00 V. What is the maximum current that can be drawn from the battery without the terminal voltage dropping below 8.75 V?
*February 23, 2013*

**math**

How much money would have to be deposited into a compound interest savings account earning 5% each year in order to accumulate $10,000 in 18 years?
*February 23, 2013*

**trig**

To determine the distance to an oil platform in the Pacific Ocean, from both ends of a beach, a surveyor measures the angle to the platform from each end of the beach. The angle made with the shoreline from one end of the beach is 83 degrees, from the other end 78.6 degrees. ...
*February 19, 2013*

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