# Posts by Marco

Total # Posts: 249

**Math. Fractions**

Emily exercised from 4:05pm tob4:32 pm For what part of an hour did Emily exercise ? Write the fraction in simplest form Would it be 27/60 = 9/20

*May 17, 2012*

**Physics**

a train is moving at 45km/h when a coupling breaks and the last car separates from the train. as soon as the car separates, the brakes are automatically applied, locking all wheels of the runaway car and causing a uniform decelaration of 5 m/s^2. determine the distance the car...

*February 19, 2012*

**physics**

Dolphins emit clicks of sound for communication and echolocation. A marine biologist is monitoring a dolphin swimming in seawater where the speed of sound is 1522 m/s. When the dolphin is swimming directly away at 7.9 m/s, the marine biologist measures the number of clicks ...

*December 3, 2011*

**physics**

A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 355. When a jet aircraft is taking off, the sound intensity level experienced by the crew member is 72 dB. What sound intensity level would the crew member ...

*December 3, 2011*

**physics**

A wave traveling along the x axis is described mathematically by the equation y = 0.15 sin (7.5πt - 0.49πx), where y is the displacement (in meters), t is in seconds, and x is in meters. What is the speed of the wave?

*December 3, 2011*

**physics**

A spider hangs from a strand of silk whose radius is 4.40 10-6 m. The density of the silk is 1300 kg/m3. When the spider moves, waves travel along the strand of silk at a speed of 264 m/s. Determine the mass of the spider.

*December 3, 2011*

**math**

how do u find the expanded algorithm

*November 14, 2011*

**physics**

The drive propeller of a ship starts from rest and accelerates at 3.00 10-3 rad/s2 for 2.05 103 s. For the next 1.75 103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30 10-3 rad/s2 until it slows (without reversing direction) to an angular ...

*November 10, 2011*

**physics**

At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 7.4 m above the water. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average angular speed of 1.6 rev/s. Ignore air resistance...

*November 10, 2011*

**physics**

1. Determine the total force acting downwards. Calculate the force of gravity acting on the passenger and the elevator. F = m * a Ft + Fg = 330kg * 3m/s^2 Solve for Ft?

*September 30, 2011*

**MATH**

FIND the ESTIMATE: 1) A RARE TRUFFLE ONCE SOLD FO $13.20 FOR A 0.44 OZ CAN. APPROXIMATELY HOW MUCH WOULD 1LB OF THIS TRUFFLE COST?

*September 5, 2011*

**MATH**

i am really confused is this how it should be for the actual cost $13.20 divide 0.44 oz = 30 x 16 = $480 for 1 lb for the estimate: $13 divide by 0.40oz = 32.5 x 16 = $520 pls advise

*September 5, 2011*

**MATH**

i thought i would estimate: 13.20 to 13 and .44 oz to .40 1300 divide by 40 is 32.5 per oz so 16oz equal to 1lb 32.5 x 16 : $5.20

*September 5, 2011*

**MATH**

Ms: Sue need to find th estimate: a rare truffle once sold for $13.20 for 0.44 oz can approximately how much would 1 lb of this truffle cost? would it be estimate; 13.00 x 0.40 = 32.5 x 16 = 5.20?

*September 5, 2011*

**MATH**

FIND EACH ESTIMATE: 1) A RARE TRUFFLE ONCE SOLD FO $13.20 FOR A 0.44 OZ CAN. APPROXIMATELY HOW MUCH WOULD 1LB OF THIS TRUFFLE COST? 2) THE LENGTH OF THE LONGEST LOAF OF BREAD MEASURED 1,405 FT 1 3/4 IN. IT WAS CUT INTO SLICES 1/2 IN. THICK. HOW MANY SLICES WERE THERE?

*September 5, 2011*

**Physics**

Buoyant force= weight of floating object density of liquid * volume of liquid * gravity=weight weight = mass*gravity 1350*.4524*9.81=5991.3594=weight 5991.3594/9.8= mass mass=610.74 N

*June 28, 2011*

**stressed syllables**

argument

*June 21, 2011*

**physics**

a 0.75 kg mass attached to avertical spring streches the spring 0.30m. what is the spring constant? the mass-spring system is now placed on the horizontal surface and set vibrating. what is the period of the vibration?

*March 25, 2011*

**math**

uestion: Five cards are dealt from standard deck of 52 cards, what is the probability of being dealt 3 kings? Here is what I have P(3 kings)= C(4,3) = 3 out of 4 kings being dealt C(48,2 = 2 out of remaning cards to complete 5 card deal C(52,5) = 5 cards dealt out of 52 card ...

*March 5, 2011*

**probabilities**

Question: Five cards are dealt from standard deck of 52 cards, what is the probability of being dealt 3 kings? Here is what I have P(3 kings)= C(4,3) = 3 out of 4 kings being dealt C(48,2 = 2 out of remaning cards to complete 5 card deal C(52,5) = 5 cards dealt out of 52 card ...

*March 4, 2011*

**algebra**

you have to isolate the variable, so based on that which one is easier to isolate? Y right? So the answer would be y=x+3

*March 4, 2011*

**proabilities**

LOL..not very realistic example by the textbook. Would you mind helping understand how you came up with that? which one of the probability formulas was used..I understand the answer just not sure how you came about it. Thanks

*March 3, 2011*

**proabilities**

Suppose the NBA has decided to add two more teams to the league. If 18 cities have applied for franchises, what is the probability that in a random drawing, the league selects the two westernmost cities? Having trouble with this one.

*March 3, 2011*

**Math**

Thank you!

*March 1, 2011*

**Math**

Confused on permutation or combination on this question: A VISA credit card has a first digit of 4 followed by 15 other digits. How many different VISA accounts does this allow? I know the formulas but I am having a hard time determining which one to use. Help!!!

*March 1, 2011*

**Trigonometric Ratios**

Right traingle ABC is graphed pm the coordinate plane and has vertices at A(-1,3), B(0,5), and C(4,3). What is the measure of angle C to the nearest degree? F:27 G:29 H:32 J:43

*February 14, 2011*

**Geometry**

The hypotenuse if a right triangle measures 9 inches and one of the acute angles measures 36 degress. What is the area if the triangle? Round to the nearest square inch.

*February 14, 2011*

**Geometry**

A right triangle has an angle that measures 55 degress. The leg adjacent to this angle has a length of 43 cm. What is the length of the triangle? Round to the nearest tenth

*February 14, 2011*

**Math**

thank you!

*February 11, 2011*

**Math**

-6≤x/2-4<-3

*February 11, 2011*

**Math**

just as it is written: -6 is <or= x/2-4 < -3

*February 11, 2011*

**Math**

le is less than or equal and lt is less than..was not sure how to less than equal on the computer

*February 11, 2011*

**Math**

I'm stuck on solving this one. If I could get some help please. -6 le x/2 - 4 lt -3

*February 11, 2011*

**math**

Stuck on solving this inequality, help please. 3X le 15 and 2x gt -6

*February 10, 2011*

**3 states of matter**

hi can you please help me by giving some facts on the 3 states of matter solid liquid gas

*January 28, 2011*

**physics problem**

how did u calculate "time to fall". and what is H and g in the equation: sqrt(2 H/g) = 2.86 s?

*December 20, 2010*

**physics problem**

A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 175 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?

*December 20, 2010*

**PHYSICS**

is g 9.8 or -9.8?

*December 20, 2010*

**PHYSICS**

A cannon is fired horizontally from atop a 40.0 m tower. The cannonball travels 175 m horizontally before it strikes the ground. With what velocity did the ball leave the muzzle?

*December 20, 2010*

**physics**

i don't understand your work. please try to explain it more thoroughly.

*December 20, 2010*

**science**

hey, check out wiki by yourself. I found a lot of examples

*December 5, 2010*

**math**

B--------------C--------A |------6-------|----4----| A = 8

*December 5, 2010*

**math**

B--------L--------A |---3----|----3----| 7-4= 3 4-3 = 1 so, B = 1

*December 5, 2010*

**math**

B can be -7 or 3

*December 5, 2010*

**math**

???What is the question?

*December 5, 2010*

**math**

do you mean (âˆš2y)(âˆš3)(âˆš8y) =[(2y)^0.5][(3)^0.5][(8y)^0.5] ??????? If so,it is (âˆš48)y=(4âˆš3)y

*December 5, 2010*

**algebra**

....this question have trivial solution m=-3/4 n=-67/8

*December 5, 2010*

**algebra**

hey , they are same on both sides. CAN'T solve!

*December 5, 2010*

**Probability**

total no. of the combination of two dice = 21 3/21=1/7

*December 5, 2010*

**College physics-oscillations**

hey, anyone help???? This is the most difficult question in my assignment and i need to hand in on monday!!!!!!!!!

*December 4, 2010*

**College physics-oscillations**

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume that the ...

*December 4, 2010*

**Physics**

oh, i know why i am wrong.it is because i take friction a wrong direction. thanks very much!(Damon is correct!)

*December 4, 2010*

**Physics**

(force exerted by father)+(friction)-weight along the slope = 0 F+(0.2)(35x9.81xcos11)-(35x9.81xsin11)= 0 F= -1.89N (hey, why it is negative? It is wrong. I need more information) work done = F.S

*December 4, 2010*

**Physics**

lol, both method can find the answer

*December 4, 2010*

**Physics**

At equilibrium position, K.E.=max,P.E. = 0 At the two extreme points, K.E.=0,P.E.=max Total energy is constant at ANY POINT. We find E at extreme point. E = 1/2*k*(0.8)^2 = 0.24J

*December 4, 2010*

**physics**

lol, you are welcome

*December 4, 2010*

**physics**

K.E. = P.E. 1/2mv^2 = mgh v^2 = 2gh v = (2gh)^(1/2) v = (2x9.81x155)^(1/2) v = 55.146m/s

*December 4, 2010*

**AP Physics**

I am a Hong Kong student. But i think i may help you. The only force on the ladder from the wall is the horizontal force.The system here is in static equilibrium. Net torque is zero.Let the total length of the ladder be 1m. then, (1)[(29+9.9+7.1)(g)(0.68)]sinâŠ™...

*December 4, 2010*

**College physics-oscillations**

A ball is attached by two spring as shown [vvvOvvv]. If the mass is displaced a distance â–³x BELOW the equilibrium position h (see figure A). Determine whether vertical SHM is possible for the system shown.If so, find the natural frequency. [Assume that the ...

*December 4, 2010*

**Physics**

I am a student.But i think i may help you.....the formula for the period of a simple pendulum is T = 2pi(L/g)^0.5.........as you can see..the mass do not affect the period.

*December 4, 2010*

**physical science**

what does Q=m times t times c. mean and wat are the meaning of each letter

*November 30, 2010*

**math**

thanks!

*November 15, 2010*

**math**

having a little trouble following the steps to complete this problem. Rewrite each expression with a positive ration exponent. Simplify if possible: 16^-3/4

*November 15, 2010*

**physical**

This is related to physics since it is talking about relativity. The answer is c. Imagine looking out your car window at a bus stop. If you are moving right, the bus stop seems to be moving towards your left. It moves to the left at the same speed as you move to the right. ...

*October 30, 2010*

**english-poetry**

thank you

*October 16, 2010*

**english-poetry**

I need some help in finding some good one stanza (4 lines) poems. Tried googling but my googling skills are not very good. Maybe one of you have a good list? Thanks

*October 16, 2010*

**physiology**

Need help with this one, can't really locate the answer. Consider the bifurcation of a vessel at 20 degrees from the line of blood flow (region a) and a vessel that gives off two vessels at 90 degrees from the main stream of the vessel (region b). Which region is more ...

*October 11, 2010*

**math**

Why??

*October 6, 2010*

**biology**

What happens to the cells of the body when large quantities of sodium ion were introduced to the blood stream?

*September 24, 2010*

**Science**

What happens to the cells of the body when large quantities of sodium ion were introduced to the blood stream? Having trouble with this question, any help please! ;-)

*September 23, 2010*

**math**

thanks

*September 2, 2010*

**math**

a) 6(2x-3)-5(3x-2) i have -3x-8 b) 8-2[3-5(3x-1)] not sure Thanks

*September 2, 2010*

**math**

Not sure of this one. Factor completley 1-81z^2 and this on 16p^2q^2-8pq^2+q^2

*May 19, 2010*

**Math-Factoring**

Factor completely. 10x^2yz^2 + 15xy^3z I came up with 5xyz(2xz+3y^2) Correct?

*May 19, 2010*

**Chemistry**

Which of the following substances has the greatest solubility in water? A. Ca(OH)2, Ksp = 6.5 × 10-6 B. Ag2SO4, Ksp = 1.5 × 10-5 C. PbI2, Ksp = 7.9 × 10-9 D. Zn(IO3)2, Ksp = 3.9 × 10-6 E. BaF2, Ksp = 1.5 × 10-6

*May 2, 2010*

**Math-Factoring 2**

AAAAAAAAAAAAAAAHHHHHHH...thanks..it's in the details.

*April 16, 2010*

**Math-Factoring 2**

The last one shold be (x ) (x )

*April 16, 2010*

**Math-Factoring 2**

Factor Completely 2x^3-40x^2-192x I have a common factor of x so I rewrote the problem as x(x^2-40x+192) then trying to use FOIL rewrote as (x ) (x ) And that is where i'm stuck.

*April 16, 2010*

**Math - Factoring**

Thank you. I am not feeling 100 percent confident in this topic, so you might see a few more, i do appreciate the help!

*April 16, 2010*

**Math - Factoring**

Factor Completely 6^8+12x^6-24x^4+30x^2 I got 6x^2(x^6+2x^4-4^2+5) Correct?

*April 16, 2010*

**math**

Thanks!

*April 15, 2010*

**math**

I am not totally understanding this process. Factor Completely: x^5y^2 - x^4y^2 - 2x^3y^2

*April 15, 2010*

**Algrera**

Write the equation of the line passing through the given two points? a) (3,7) and (4,7) Answer: m=7-7/4-3 b) (2,7) and (2,9) Answer: m=9-7/2-2 c) (5,-3) and (1,7) Answer: m=7-(-3)/1-5 Correct?

*March 7, 2010*

**Algrebra**

I see it thanks...

*March 7, 2010*

**Algrebra**

Write the equation of the line passing through the given point with the given slope. a) point (3,-2) with slope of m=5/3 Answer: y-(-2)=5/3x-3 b) point (3,9) with slope m=(-2/7) Answer: y-9=-2/7x-3 Correct?

*March 7, 2010*

**Algebra**

Great! Thanks

*March 6, 2010*

**Algebra**

1. Write the equation of the line with the given slope and y-intercept a) m=3/8 and b=6 Answer: y=3/8x +6 b) m=-2 and b=11 Answer: y=-2x+11 c) m=0 and b=6 Answer: y=x+6 Correct?

*March 6, 2010*

**Algebra**

thanks!

*March 6, 2010*

**Algebra**

Thank you bun, but how did you come up with that anser for B

*March 6, 2010*

**Algebra**

3. Find the slope of each line with equation as given. a) Y=4 b) X=2 Answers: a) zero b) undefined 4. Graph the following equations: a) 3x-2y=6 answer: (2,0) and (0,-3) b) 5x+3y=6 (need help with this one) Are they correct and would need help with b.

*March 6, 2010*

**Algebra**

Thanks you will, just looking for validation and help on the ones i don't unsderstand. Thanks again.

*March 6, 2010*

**Algebra**

1. Compute the slope of the line containing each pair of points. a) (3,7) and (4,7) b) (2,7) and (2,9) c) (5,-3) and (1,7) Here is what I got. a) 0 b) undefined c) -10/4 reduced to -5/2 Correct?

*March 6, 2010*

**math**

Thanks. I was translating the problem incorrectly. I got the right answer using the formula A=P*B A=15*102 A=15.30 15.30 + 102.00 = 117.30 Thanks.

*February 11, 2010*

**math**

Never mind it's not right..just having a brain fart :-)

*February 11, 2010*

**math**

errrgg..i meant i figured out #2 i need help with #1. My formula is as instructed. B=a/p (Base=amount/percent) My answer is: B=102.00/0.15 B=6.80 so the regular prices is 102.00+6.80=108.80 Is that correcT?

*February 11, 2010*

**math**

I figured out #1 just need help with #1

*February 11, 2010*

**math**

I have two questions. I am trying to use the formulas our teacher used but I am still confused. I will discuss it with him tonight but I just wanted to get a different perspective. #1 Amy paid $102 for a pair New Balance 1122 running shoes during a 15%-off sale. What was the ...

*February 11, 2010*

**math-percent**

Thanks.

*February 10, 2010*

**math-percent**

Is anyone familiar with this formula for figuring out percent? How it would work? p/100 = of/is

*February 10, 2010*

**Algebra**

Help with this one: 2/3+4t=6t-2/15

*February 6, 2010*