Friday

February 24, 2017
Total # Posts: 105,573

**Algebra Word Problem**

n (n+2) (n+4) n(n+4) = 9 +12(n+2) n^2 + 4 n = 9 + 12 n + 24 n^2 - 8 n - 33 = 0 (n-11)(n+3) = 0 n = 11 n+2 = 13 n+4 = 15

*February 20, 2017*

**math (precalc)**

(x-5)(x-5)(x-3+4i)(x-3-4i) = 0 (x^2-10x+25)(x^2-6x+25) multiply that out

*February 20, 2017*

**physics**

I do not understand your second problem.

*February 20, 2017*

**physics**

average speed during stop = 25/2 = 12.5 m/s time to stop, t = 125/12.5 = 10 s v = Vi + a t 0 = 25 + a(10) a = -2.5 m/s^2 F = m a F = -2.5 m F = -mu m g F = -mu m (9.81) so mu(9.81)=2.5 mu = 2.5/9.81

*February 20, 2017*

**physics1**

What is the magnitude of your total displacement if you have traveled due west with a speed of 23 m/s for 125 s , then due south at 12 m/s for 255 s ? Express your answer using two significant figures. What is the direction of your total displacement in part A.

*February 20, 2017*

**History**

Who does Robespierre round up and execute

*February 20, 2017*

**History**

What was the name of the new freedom of the press newspaper created by Jean Paul Marat

*February 20, 2017*

**History**

When does the Terror end and who seizes control of france? July 27 1794 and Napolean

*February 20, 2017*

**Physics**

which of the following is NOT true about the path of a cannon ball launched horizontally from the earth's surface if air resistance is neglected? a. the cannnonball has a uniform horizontal velocity b.the total velocity of the cannon ball increases as a function of time c....

*February 20, 2017*

**Physics**

What happens to the location of the image when the radius of curvature changes? I think it moves farther away when the curvature increases.

*February 20, 2017*

**math**

x is distance between d is how close the close one is I assume they are on exactly the same bearing , not just the same side, or the problem is meaningless. People who write math books do not navigate. tan 42 = 48.8/d tan 35 = 48.8/(d+x) so d = 48.8/tan42 so d = 54.2 and 54.2...

*February 20, 2017*

**math**

tan 46 = h/400

*February 20, 2017*

**Math**

you must find the other side of rectangle using Pythagorean theorem where 5 is the hypotenuse and 3 is one of the legs. you will find out that the other leg is 3 cm. then find the area of the triangle 1/2bh using 4 as the height and 3 as the base.

*February 20, 2017*

**mathmatics**

A man has Rs 10000. he lost 2/5 of his money and he spent 1/4 of the reamainder. find the reamaining money with him now.

*February 20, 2017*

**Science **

density of wood that is 20 cm below water and 60 cm above water

*February 20, 2017*

**psychology**

Dr. Zimand is studying testosterone levels and their influence on aggression in adult males. It is likely that Dr. Zimand specializes in the ____________ approach to psychology.

*February 20, 2017*

**Chemistry**

Recall the reactions for this lab: S2O82- + 2I- ? 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- ? 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, ?[S2O32] = c. Use the ...

*February 19, 2017*

**Chemistry**

. A student mixed the following reactants, using the general procedure for the experiment: 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 20.0 mL of 0.040 M K2S2O8, and 10.0 mL of 0.10M HCl. It took about 75 seconds for the mixture to turn blue. a. By using the dilution ...

*February 19, 2017*

**Math 104**

There are 5 cyclists in a race. There will be a first-place and a second-place prize awarded. In how many different ways can the 2 prizes be awarded?

*February 19, 2017*

**chem**

0.210 mole of Na2CO3 in 200.0 mL of solution

*February 19, 2017*

**physics**

how is energy conserved ith a spring and box on a ramp. does 1/2kx^2 still equal gpe? what if the spring displacement is the same but the angle of the ramp changes, causing the gpe to change. how is energy conserved since the gpe is lower than before but the spring pe is the ...

*February 19, 2017*

**addition vectors (physics)**

east components (+ x axis) 75 cos 25 - 75 cos 65 north components (+ y axis) 75 sin 25 - 75 sin 65 - 75 so I get east = +36.3 km north = -111 km distance = sqrt(36.3^2 +111^2) tan angle south of east =111/36.3

*February 19, 2017*

**Physics**

You have typed this all wrong but look at the question above this one to see how to do it.

*February 19, 2017*

**MATH**

What is the percentage of sugar in the syrup made of 10 kg of water and 15 kg of sugar?

*February 19, 2017*

**Algebra**

150g of sugar was used to make a bottle of 8% syrup. How much water was used to make this bottle of syrup? How much syrup is there in this bottle?

*February 19, 2017*

**Geo**

(SAT Prep) The perimeter of pentagon ABCDE is 30 in, AB = 7 in, BC = CD = 6 in, DE = 5 in. How many sides of the pentagon have equal length?

*February 19, 2017*

**Geo**

(SAT Prep) The diagonals BF and CE divide the hexagon ABCDEF into two equilateral triangles and a square. Find the perimeter of the hexagon if BF = 3 cm.

*February 19, 2017*

**Maths,**

(2/5)s + (1/4)s = (8/20 +5/20)s = (13/20)s so (7/20)s = 2.10

*February 19, 2017*

**Algebra I**

3 c + 5 b = 31 c = 3 b - 1 ====================== 3 (3b-1) + 5 b = 31 9 b - 3 + 5 b = 31 14 b = 34

*February 19, 2017*

**your turn**

This is so similar to ones I have shown you how to do that you should be able to do it.

*February 19, 2017*

**Physics**

By the way, I am assuming that either way the man goes up into the container. If not then he has to move his own mass up, not only the wheelbarrow.

*February 19, 2017*

**Physics**

It does? Not in my shipyard :) Block and tackle tends to have higher frictional losses than a wheelbarrow. All methods do the same amount of "useful" work. That is the weight times 4 meters up. With your simple machines, wheels up ramps, blocks and tackles, you ...

*February 19, 2017*

**Physics**

primarily friction loss, bearings heat up on axle where wheelbarrow wheel turns.

*February 19, 2017*

**chemistry**

.43 L (1.25 mol/L) = .525 mols needed .525 mols (1 Liter/3.9 mol) = 0.135 Liters

*February 19, 2017*

**chemistry**

.17 *1.1 = .187 mols CaCl2 = 111 grams/mol (40 + 2*35.5 ) .187 mol (111 g/mol) = 20.8 grams

*February 19, 2017*

**Chemistry**

N = 14 g/mol H = 1 g/mol NH3 = 14+3 = 17 g/mol 3.68 g * 14/17 = 3.03 grams of N needed by the way check grams of H 3.68 *3/17 = .65, just enough hydrogen:)

*February 19, 2017*

**Chemistry**

Hello, I really don't understand how to find the grams of moles in some of these reactions. If someone could help I would appreciate it. 1) Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g) are consumed in the...

*February 19, 2017*

**Algebra**

James has a 6-ft board that is 24 in. wide. He wants to cut it into five pieces to make a small bookshelf with two shelves. The front and back will not be covered. What should be the dimensions of the bookshelf to maximize the volume and use all of the 6-ft board?

*February 18, 2017*

**Algebra**

A page should have perimeter of 42 inches. The printing area within the page would be determined by top and bottom margins of 1 inch from each side, and the left and right margins of 1.5 inches from each side. What should be the overall dimensions of the page in order to ...

*February 18, 2017*

**Math**

The cost of renting a car is given by the formula C= 50n +0.15d, where C is the cost in dollars, n is the number of days rental, and d is the distance driven in miles. How much would it cost to rent a car for a 15- day road trip, and drive 475 miles each day? My Answer: 8 ...

*February 18, 2017*

**Math**

-1/8(x+35)= -7 How do I solve this??? I am confused

*February 18, 2017*

**Math**

I don't think so since the answer is nothing to the choices A. $144 B. $199 C. $251 D. $277

*February 18, 2017*

**Math**

Karen spents 450 dollars on monthly bills. Of this total amount, 12% is for phone service,1/10 is for Internet service, and 2/9 is for utilities. If the rest of the total amount is for food, how much does Karen have for food? I said $130 since I subtract all

*February 18, 2017*

**english**

I worded the sentence to how I thought it should look like. So I'm guessing it's wrong? Do I put a comma before the h?

*February 18, 2017*

**english**

More states have, “… embraced laws requiring waiting periods for abortion…” however this is unfair to the women going through this. Would I capitlize the however or leave this sentence how it is

*February 18, 2017*

**Algebra I**

4 p = 2 m -2 so m = 2 p + 1 3 p + 9 m = 54 3 p + 9 (2 p + 1) = 54 etc

*February 18, 2017*

**electronic**

Determine the power dissipated in each of the resistors and the power entering the source. Express your powers in Watts. Remember that the power entering a two-terminal device is the product of the voltage across the device and the current through it in the associated ...

*February 18, 2017*

**Psychology**

s

*February 17, 2017*

**grammar simple, compound/complex**

1. We like stories which have unusual endings. <-- compound 2. The novel that was written is about dragons. <-- complex 3. The main character Adela is interesting; she is a warrior. <-- Compound 4. Dragons are ruining the small village in the story. <--- simple 5. ...

*February 17, 2017*

**english 2**

In this scene the Sergeant compares Macbeth and Banquo to â€œAs sparrows eagles, or the hare the lion.â€ Knowing that the eagle and the lion are predators and the sparrow and the hare are prey, what does Shakespeare reveal about the characters ...

*February 17, 2017*

**Ethics**

Please assume that, in the process of assisted reproductive technology (ART), more human embryos were created than are needed by the donors for the purposes of their assisted reproduction. Under these circumstances, which of the following is most likely to conclude that it is ...

*February 17, 2017*

**math**

The particular solution of the differential equation dy/dt equals y over 4 for which y(0) = 20 is y = 20e?0.25t y = 19 + e0.25t y = 20 e0.25t - my answer y = 20e4t

*February 17, 2017*

**math**

a square green rug has a blue square in the center. the side length of the blue square is x inches. the width of the green band that surrounds the blue square is 6 inches.

*February 17, 2017*

**Physical sciences**

used as a fertalizer

*February 17, 2017*

**Physical sciences **

One use of nitrolim

*February 17, 2017*

**chemistry**

ur dumb then bobpursley

*February 16, 2017*

**Math**

Mr rainwater has 9 goats and 36 cows and 6 horses on his farm. He has 4 times as many cows as chickens. How many chickens does he have?

*February 16, 2017*

**math**

Is it possible to write a second linear equation to create a system that had one solution and the same y-intercept as -9x+3y=12?

*February 16, 2017*

**Art**

What technology does an X-ray use to see below the surface of a work of art? a) laser technology b) electromagnetic radiation c) color spectrums d) computer software

*February 16, 2017*

**Ethics**

n making a decision about the ethics of abortion, is viability (existence, development and growth) of the fetus an ethical valid distinction? Eventually babies may be viable from point of conception. Im really not sure what the question saying? help?

*February 16, 2017*

**i wrote the answer down please anyone**

Velocity 49.50

*February 16, 2017*

**Help! I need somebody, not just not anybody**

I'm not sure if this is right but my answer was 49.50 for the skier

*February 16, 2017*

**Physics**

A novice skier starts from rest and slides down a frictionless 35 degree incline whose height is 125 m. How fast will she be going at the bottom?

*February 16, 2017*

**Chem**

Calculate the mass of 0.025 moles of sodium bicarbonat

*February 16, 2017*

**Calculus**

Given k(p) = |p|+4, find the average value of this function on the interval from -4 to 4. I get 6.

*February 16, 2017*

**SS**

Image URL: h t t p : / / b i t . l y / 2 l o x J p 0 1. Which of the following best accounts for the number of southern votes cast for Johnson’s impeachment? a). Only a few southern states have been readmitted to the Union. b). Southern states only had voting rights in ...

*February 16, 2017*

**Math - Calculus**

f(x) = { x^2sin(1/x), if x =/= 0 0, if x=0} a. find lim(x->0)f(x) and show that f(x) is continuous at x=0. b, find f'(0) using the definition of the derivative at x=0: f'(x)=lim(x->0) (f(x)-f(0)/x) c. Show that lim(x->0)f'(x) does not exist. In particular...

*February 16, 2017*

**Math**

Yolanda buys two types of flowering plants. She buys 36 geraniums and 63 marigolds she wants to plant an eeach row will contain only one type of flowering each row will contain only one type of flowering plant Yolanda uses all the plants she bought in her garden determine the ...

*February 15, 2017*

**Social studies**

If you take the late 1800s, for example, nativism led to the Chinese Exclusion Act of 1882.

*February 15, 2017*

**Calculus**

Find the derivative of the integral from 2 to 5x of (sqrt(1 + u^2))/u. My answer: (sqrt(1 + 25x^2)/5x) * 5????

*February 15, 2017*

**physics**

a sled weighing 100lb reaches the foot of a hill with a speed of 40ft/s.The coefficient of kinetic friction between the led and the horizontal surface of the ice at the foot of the hill is 0.030.

*February 15, 2017*

**Physics-Energy**

what is missing?

*February 15, 2017*

**Physics-Energy **

Loop Track Location 1 Location 2 Location 3 PE (J) 0.16 0.12 0.04 KE (J) 0.03 0.06 0.09 TME (J) 0.19 0.18 0.13 h (m) 0.4 0.3 0.1 v (m/s) 1.2 1.7 2.1 Roller Track Location 1 Location 2 Location 3 PE (J) 0.12 0.08 0.04 KE (J) 0.03 0.06 0.07 TME (J) 0.15 0.14 0.11 h (m) 0.3 0.2 ...

*February 15, 2017*

**Math**

Thank u Ms.Sue

*February 15, 2017*

**algerbra 1**

(k^2-4k+3)-(k-2)

*February 15, 2017*

**Calc**

Find the derivative from x to x^8 (integral) of ln t dt.

*February 15, 2017*

**maths**

in a class the ratio of boys to girls is 3;4 there are 12boys in the class what fraction of the class are boys and how many girls are there

*February 15, 2017*

**Math**

1. The sides of triangle CAB are in the ratio of 2:3:4. Segment BD is the angle bisector drawn to the shortest side, dividing it into segments AD and DC. What is the length, in inches, of the longer subsegment of side AC if the length of side AC is 10 inches? Express your ...

*February 15, 2017*

**Chemistry**

In the following chemical reaction between H2 and Cl2 to produce HCl, what is the mass of HCl produced with 0.35g of H2 completely reacts with 12.42g of Cl2?

*February 15, 2017*

**Physics**

d = (1/2) a t^2 300 = (1/2) a (900) so a = 600/900 = 2/3 = 0.67 m/s^2 F = m a = 670 N

*February 15, 2017*

**science**

Probably each circle designates a constant pressure but I do not know if you are talking about meteorology or what.

*February 15, 2017*

**maths**

Sum of four term in GDP is 30 sum of first and fourth terms is 18 then find the term

*February 15, 2017*

**math**

Let f of x equals 4 for x less than or equal to 3 and equals the quantity 7 minus x for x greater than 3. Use geometric formulas to evaluate the integral from x equals 1 to x equals 7 of f of x, dx. I got 16 but i dont think it is right.

*February 15, 2017*

**Math**

You shoot a rifle at an angle of 42 degrees. The bullet leaves your rifle at a height of 6 feet and a speed of 810 feet per second. So I used the equation h(t)=6+(810 sin42)t-16t^2 to calculate that the bullet will hit the ground after 33.88580 seconds. Now how do I calculate ...

*February 14, 2017*

**math**

A farmer has enough food to last his 40 cattle 35 days. If he buys 50 cattle, how long can the same feed can last? Let X be the number of days the same feed can last

*February 14, 2017*

**HISTORY**

And so the American Rev ended 1783?

*February 14, 2017*

**HISTORY**

american revolution 1775 or 1763? Because I know the first battle was 1775 but I have to make a timeline and put when the event occurred so idk if I should put 1775 or when it all started, 1763.

*February 14, 2017*

**Social Studies**

Please trust me, these are the correct answers: B D B C Have a good one! = )

*February 14, 2017*

**Math Calc**

John was wondering at what speed an arrow leaves a bow when it is released. So he went to a field and shot the bow at an angle of 45 degrees. The arrow hit the ground at a distance of 600 feet. Ignore air resistance. For simplicity, assume that the arrow is released at an ...

*February 14, 2017*

**Algebra **

find the distance between the pair points (-2, -3) and (-12,-19)

*February 14, 2017*

**chemistry**

queous solution of sodium phosphate (Na3PO4). Adding which compound to the solution will cause a phosphate compound to precipitate?

*February 14, 2017*

**Math**

Find k so that (x-2) is a factor of x³+kx-4? Kindly help me this one

*February 14, 2017*

**math**

A train starting at 11 am travels east at 45 km / hr while another starting at 12 noon from the same point trivels south at 60 km / hr . how fast the train separating at 3 p. m

*February 14, 2017*

**algebra**

if you have a 15 ft ladder and angle it 75 degrees how far from the house will the base of the ladder be

*February 14, 2017*

**algebra**

if you have a 15 ft ladder and angle it 75 degrees how far from the house will the base of the ladder be

*February 14, 2017*

**Math**

The total length of 4 blue banner and 5 yellow banner is 49 m. The total length of 2 blue banner and 1 yellow banner is 17 m. All banner of the same colour have the same length. Find the length of a blue banner

*February 14, 2017*

**Physics **

two identical metallic ball spherical shells A and B charges 4Q and -10c are kept a certain distance apart a third uncharged sphere C is first placed in contact with sphere A and then with sphere B the sphere B are bought in contact and then separated find the charge on sphere...

*February 14, 2017*

**Pre-Calculus**

correction cot(?/2-?)cos?

*February 13, 2017*

**Pre-Calculus**

That is indeed hard, someone help this man.

*February 13, 2017*

**Pre-Calculus **

explain how to do these with please. I was out a couple of days so give clear instructions. sin(?/2-?)sec? cot(?/2-x)cos?

*February 13, 2017*