Tuesday

February 9, 2016
Total # Posts: 237

**Math**

You have a total of 21 pens and pencils. You have 3 more pens than pencils. Write a system of linear equations that represent this situation. How many of each do you have?
*January 5, 2016*

**physics**

if you use a horizontal force of 30 N to slide a 12 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?
*October 12, 2015*

**physics **

Block A (Mass = 2.319 kg) and Block B (Mass = 1.870 kg) are attached by a massless string as shown in the diagram. Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over (you guessed it) a frictionless, massless pulley...
*October 8, 2015*

**physics **

A 3.90 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1N at an angle theta=32.5degrees above the horizontal, as shown. a.) What is the magnitude of the acceleration of the block when the force is applied? b.) What is the ...
*October 8, 2015*

**Physics **

Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 38 kg, m2 = 37 kg, and m3 = 17 kg. a.) The pulling force is equal to T3 = 45 N. What is ...
*October 8, 2015*

**Math**

A pilot test requires 3 out of 5 students to be tested if there are 930 kids, how many will have to take the test? Please help! Thank you
*September 15, 2015*

**LA**

oh ok i get it thank you
*June 9, 2015*

**LA**

Essay Questions? i think Essay questions are for when you have to write or type something in your own word it that correct
*June 9, 2015*

**LA**

what are essay question i always get them on my test but i do not know what they are
*June 9, 2015*

**L A/The Giver**

a a d c
*May 20, 2015*

**Physics**

The space shuttle is in a 3e+5 m high orbit over the earth. The radius of the earth is 6.37e+6 m, the mass of the earth is 5.98e+24 kg. What is the distance from the center of the earth to the space shuttle? I don't know whether I would double the radius and the add the ...
*January 31, 2015*

**Physics**

Musicians can use beats to tune their instruments. One flute is properly tuned and plays the musical note A at exactly 440Hz. A second player sounds the same note and hears that her flute is slightly "flat" (that is, at too low of a frequency). Playing at the same ...
*December 9, 2014*

**Physics**

1) F=ma a=(mh*g)/(7/5ms+1/2md+mh) 2) same answer as 1 because it is a system 3)a=alpha*R alpha=a/Rd (use a from 1) 4) similar to 3 alpha=a/Rs 5)F=ma T=ms*a T=7/5ms*a (a from 1) 6)T=mh(g-a) 7)d=1/2at^2 (position formula - starting position and velocity are zero) t=sqrt(2d/a) (...
*November 10, 2014*

**science**

Find the mass of potassium chloride and volume of oxygen at STP liberated when 0.5 moles of potassium chlorate are heated.Also find the moles and mass of oxygen evolved.
*June 22, 2014*

**physics**

I weigh 130 pounds, so how much would I weight on a neutron star?
*May 28, 2014*

**Chemistry**

A column of mercury in a barometer is 767.3 mm Hg high. Note, that in order for the pressures to be equal, density and height of a column are inversely proportional, therefore, (den1)(h1)=(den2)(h2). The density of mercury is 13.6 g/mL and the density of water is 1.00g/mL. a) ...
*April 16, 2014*

**Physics**

A 2050 kg truck is traveling east through an intersection at 2.3 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 4.5 m/s. The other is a 1600 kg midsize traveling east at 10 m/s. The...
*March 8, 2014*

**bobpursley**

yes it is
*February 12, 2014*

**physics**

Three blocks on a frictionless surface are connected by massless strings, with M1 = 1.40 kg, M2 = 2.40 kg, and M3 = 3.60 kg. Due to the force F acting on M3, as shown, the system accelerates to the right. Given that T1 is 3.50 N, calculate T2
*February 12, 2014*

**Math**

A rectangular enclosure is to be constructed with 800 feet of fence in order to have four sections. What should be the dimensions in order to maximize the area enclosed? What is the maximum area?
*December 1, 2013*

**Math. Explanation Needed**

You know that 60✖️10=600 and so you know that 621➗59 is going to be more than 10.
*October 17, 2013*

**6 grade math**

i need help with 2 - 2/3
*October 3, 2013*

**math**

For all x greater than 2, let *x be defined as the sum of the positive integers less than x. What is the value of *16 - *13?
*September 28, 2013*

**math**

7√x +16=79, What is the value of x? a. 3 b. 6 c. 9 d. 27 e. 81
*September 28, 2013*

**Statistics**

A carload of stone taken from a quarry by the plug-and-feather method contains pieces of stone have a mean weight of 1,500 pounds and a total weight of 36,000 pounds. Another carload of stone produced by the explosive method (where stone is blasted into random shapes by ...
*September 18, 2013*

**math**

Simply each expression. Use only positive exponents. (2t)^6 r^5/g^-3
*March 17, 2013*

**algebra**

Given a set of data pairs, how would you decide whether to use interpolation or extrapolation to find a certain value?
*January 14, 2013*

**math**

Describe how the slope of a line relates to a trend line.
*January 13, 2013*

**statistics**

if a test has a mean of 150 and a standard deviation of 30, we know that: a)50% of the respondents scored between 180 and 210 b)68% of the responents scored above 120 c)50% of the respondents scored between 120 and 210 d) 96% of the respondents scored between 90 and 210
*November 21, 2012*

**Math**

Not inequality I meant equation.
*November 8, 2012*

**Math**

How do I solve this absolute value inequality? Should I add two to both sides first? | -3n | - 2 = 4
*November 8, 2012*

**Math**

What is 6x minus 6x? 0x or just 0?
*November 1, 2012*

**math**

solve each equation /y/=17 /s/=0 -x=-4 -y=6 help!!!!
*October 29, 2012*

**math**

find each absolute value /14/... p.s the lines are suppose to be straight.
*October 29, 2012*

**Math**

For the second one I have this but I'm not sure what to do next Add 4x to both sides, so you would have 2y+6a=4x Then I divided 2y by 2 and 4x by 2 and got y+6a=4x Next I subtracted 6a from both sides and got y=2x-6a Am I right so far? If so what do I do next?
*October 11, 2012*

**Math**

slope and y intercept form of these two problems? Y-5=1/3(x-9) 2y+6a-4x=0
*October 11, 2012*

**Math.. please helpp!**

A female moth lays nearly 150 eggs. In on year there may live up to five generations. Each larva eats about 20mg of wool. Assume that 2/3 of the eggs die and that 50% of the remaining moths are females. Estimate the amount of wool that may be destroyed b the descendants of one...
*September 30, 2012*

**Math**

A female moth lays nearly 150 eggs. In on year there may live up to five generations. Each larva eats about 20mg of wool. Assume that 2/3 of the eggs die and that 50% of the remaining moths are females. Estimate the amount of wool that may be destroyed b the descendants of one...
*September 30, 2012*

**Math**

What is the independent and dependent variable in the situation. And what is the rate of change for the situation? Hannah delivered 12 newspapers after 20 minutes and 36 papers after 60 minutes
*September 26, 2012*

**math**

a chef can bake 15 cakes in one hour. what is the rate in pies per mintue
*September 25, 2012*

**Geometry**

The surface area of the sides of a right cylinder can be found by multiplying twice the number pie by the radius times the height. If a circular cylinder has radius (r) and height (h), write an expression that represents the surface area of its size.
*September 24, 2012*

**Math**

A used bookstore sells paperback fiction books in excellent condition for 2.50$ and In fair conditions for 0.50$. Write an expression for the cost of buying (e) excellent condition paperback and (f) fair condition paperback.
*September 24, 2012*

**English**

I feel stupid for not knowing these but I can't figure it out! So in the sentence we have "underline the verb be (and its various forms) and decide how it's used. Circle the verb its helping or linking to and Write linking verb or helping verb on the line" ...
*September 24, 2012*

**math**

the world record for the 100 meter butterfly swim set in 1999 was 51.81 sec. What was the average rate per second?
*September 21, 2012*

**math**

tell whether the given rates are equilivent... 32 ft/sec; 192 ft/min. ________________________________ 8.4 gal/day; 2 qt/hr..
*September 21, 2012*

**math**

complete each equation.. 1.5mi/min=________ mi/hr $1.92 per lb=________ per oz $18,500 salary per year=______ per week 42 hr/week=________ hr/day
*September 19, 2012*

**math**

so ms. Sue the answer is what u put on top?
*September 19, 2012*

**math**

442 mi in 8.5 hr.... now name the units in each rate then write a unit rate.
*September 19, 2012*

**Math**

You decide to build a pyramid out of wooden blocks. Each block must rest on the corners off 4 other blocks. If there is one block on top and 36 on the bottom, what is the total number of blocks you will need to complete the pyramid?
*September 14, 2012*

**English **

So for the summer I had to read cat's eye by Margaret Atwood and this happened to be a hard book to understand for me. I need help writing an essay in which I have to write an analytical essay detailing 3 events in the story where the author notably develops specific ...
*August 24, 2012*

**English**

I would like some ideas or suggestions on how to approach this essay. Thanks.
*August 24, 2012*

**English**

After reading cat's eye by margaret Atwood, I had to write a essay. the essay required me to write an analytical essay detailing 3 events in the story where Atwood notably develops specific character traits in elaine Risley so that the reader can Identify with very human ...
*August 24, 2012*

**Math**

Find two numbers that have 2,3 and 5 as factors. What other factors do the two have in common?
*August 21, 2012*

**Math**

Find two numbers that have 2,3 and 5 as factors. What other factors do the two have in common?
*August 21, 2012*

**Geomerty**

Write the equation of the line with the slope 3/7 passing through the point (9,-2)
*August 10, 2012*

**math**

susan, joanne, and diane are triplets. susan has red, blue, green, and yellow sweaters. janne has green, red, purple, and white sweaters. diane's sweaters are red, blue, purple, and mauve. each girl has only one sweater of each color, and will pic a sweater t wear at ...
*May 28, 2012*

**english**

What grammatical structure is the italicized portion of the sentence? We walked along the mountain path looking for unusual flowers.
*May 23, 2012*

**Physics **

For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel? my teacher said...
*May 22, 2012*

**Physics **

For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
*May 22, 2012*

**History**

no the open door policy granted equal trade opportunities to all countries
*May 21, 2012*

**World History**

yup a
*May 21, 2012*

**math**

use pascals triangle 1 5 10 10 5 1 for example Expand (2 + 3x)5. Applying the general rule of ascending and descending indexes and the coefficients from Pascal we can immediately expand the above equation (if we set a to 2 and b to 3): 25 + 5(24)(3x) + 10(23)(3x)2 + 10(22)(3x)...
*May 21, 2012*

**Science**

1. An electric space heater draws 15.0 A from a 120 V source. It is operated, on average, for 5.0h (hours) each day. a) How much power does the heater use and b) At $.10 per kWh, what does it cost to operate the heater for 30 days? 2. Suppose each person in the United States ...
*May 15, 2012*

**Math**

Can you please explain to me how to change them into decimals? The fractions i used are just made up so you can use any fraction you would like to show me. Thank you.
*April 23, 2012*

**Math**

I am trying to remember how to figure out which fraction is the greatest/least. Do i have to find the common denominator? An example would be 1/4, 3/8, 6/10, 1/7 ... kind of like this, only many more ... Thank you.
*April 23, 2012*

**Math**

$48.75 per square root
*April 8, 2012*

**physics**

A vertical tube with a tap at the base is filled with water, and a tuning fork vibrates over its mouth. As the water level is lowered in the tube, resonance is heard when the water level has dropped 18 cm, and again after 54 cm of distance exists from the water to the top of ...
*March 28, 2012*

**statistics**

customer arrive at alocal ice cream stand at an average rate of 16 perhour. what is the probability that 2 customer will arrive during the next 15 minutes?
*March 20, 2012*

**math**

4,149 miles
*March 1, 2012*

**Math**

Robin cross- stitches bookmarks and wall hangings . A bookmark takes her 1 1/2 days, and a wall hanging takes her 4 days. Robin recently spent 18 days cross- stitching 7 items. Solve the system of equations to find the number of bookmarks b and the number of wall hangings w ...
*February 25, 2012*

**Math**

3k/5+44=12k/25+8 Please help me solve this and show your work thanks
*February 16, 2012*

**english**

14. cat \kat\ n. 1. a carnivorous mammal (Felis catus) long domesticated as a pet and for catching rats and mice; 2. any of a family of carnivorous mammals (as the domestic cat, lion, tiger, leopard, jaguar, cougar, wildcat, lynx, and cheetah) What do the italicized words ...
*January 5, 2012*

**math**

a ladder 39 ft long leans against a building and reaches the ledge of a window if the foot of the ladder is 15 ft from the foot of the building how high is the window ledge above the ground tot the nearest foot.
*December 19, 2011*

**math**

approximate to the nearest inch the lenght of a rectangle whose diagnol measures 25.0 inches and whose width is 18.0
*December 19, 2011*

**math**

a 3ft tall boy casts a 4ft shawdow at the same time a tree casts a 72 foot shawdow using the pythagorean therem find the distance from the top of the tree to the tip of the shawdow
*December 19, 2011*

**alegebra**

if i bought 4 pairs of shoes for $325.50 and later bought another pair of shoes for $35, what was the mean cost of all the pairs of shoes?? thanks!(:
*December 15, 2011*

**alegebra**

if a rectangular pen for dogs has an area of 480 square meters, and the length of the pen is 2.4 meters, what is the width of the pen??
*December 15, 2011*

**geometry**

in quadrilateral ABCD AC is a diagonol, m<ACD=2x+4 and m<ACB=5x-11 what proves ABCD a rhombus
*November 30, 2011*

**Psychology Please Help!**

A!
*November 26, 2011*

**chemistry**

for the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluable salt. KCl, BaCl2, AgNO3, Pb(NO3)2, K2SO4, HNO3
*October 28, 2011*

**chemistry**

1. How many grams of P4 will react with 35.0 grams of H2O according to the balanced equation P4+5O2+6H2O=4H3PO4? 2. If you have 50 grams of P4, 40 grams of H2O, and an unlimited supply of O2, which reactant (according to the above balanced equation) is the limiting reactant? ...
*October 16, 2011*

**chemistry**

Refer to 3CuCl2 (aq)+2Na3PO4 (aq) = Cu3(PO4)2+6NaCl (aq) If a student started with 18 grams of CuCl2 and enough Na3PO4 to completely react, how many grams of Cu3(PO4)2 will (theoretically) be produced?
*October 16, 2011*

**Organzie **

Sorry about the name my sister wrote that. She ask me to ask you for the ideas.
*October 1, 2011*

**Organzie **

How do you organzie binders? Also I'm making a homework binder. I need some ideas. Please Thank You !!! :)
*October 1, 2011*

**Calculus. Please help!**

Would I then plug in x and y into the original equation to find the minimum value? When I do that I get approximately 19.472, but my webwork homework says that is incorrect.
*August 10, 2011*

**Calculus. Please help!**

Find the minimum value of the function f(x,y= 25x^2+3y^2+20xy+10x+4y+10 subject to the constraint 5x^2+4xy=1. I solved fx=50x+20y+10 fy=6y+20x+4 gx=10x+4y gy=4x Then what?
*August 10, 2011*

**Calculus**

Solve the separable differential equation: dy/dt=4y^6 and find the particular solution satisfying the initial condition y(0)=-3 y(t)=?
*July 29, 2011*

**Calculus**

A cost function is given by: A'(x)= 2x^2/x^2-211/x^2. For what values is A(x) increasing and decreasing? Any help would be appreciated
*July 19, 2011*

**Calculus**

A manufacturer can produce digital recorders at a cost of 60 dollars each. It is estimated that if the recorders are sold for P dollars a piece, consumers will buy q= 150-p recorders each month. What is the average rate of profit obtained as the level of production increases ...
*July 18, 2011*

**Calculus**

Find the derivative of: y= 5^x + 15/x^6 I'm assuming I need to take the natural log of each side, but I get stuck after that part.
*July 18, 2011*

**Another Calculus**

Sorry I have been trying to figure this out all day. Find the largest and smallest values of the given function over the prescribed closed, bounded interval. g(t)= (t^3/2)(e^-2t) for 0<t<1.
*July 11, 2011*

**Calculus**

Using logarithmic differentiation find the derivative of f(x)=2x/x. I can't seem to figure this out.
*July 11, 2011*

**Calculus**

How did you get (3x-4) from (3x-1) when you took the first derivative?
*July 10, 2011*

**Calculus**

Find the largest and smallest values of the given function over the prescribed closed, bounded interval of: f(x)=(3x-1)e^-x for 0<x<2
*July 10, 2011*

**calculus**

Find the second derivative of: h(t)= (t^2 + 5)^8
*June 29, 2011*

**calculus**

Please disregard. I solved the problem. Thank you anyways.
*June 26, 2011*

**calculus**

A stone is dropped from a height of 144 feet. a. When will the stone hit the ground? b. With what velocity does it hit the ground?
*June 26, 2011*

**calculus**

I believe we have to express it as a function using f(x) and g(x)....not sure.
*June 23, 2011*

**calculus**

At age 15, Nan is twice as tall as her 5-year-old brother Dan, but on Dan's 21st birthday, they find that he is 6 inches taller. Explain why there must have been a time when they were exactly the same height
*June 23, 2011*