Monday

February 20, 2017
Total # Posts: 105,358

**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*

**math**

If f(x) is an even function and passes through the point (5, 3), what other point must lie on the graph of the function? Explain your reasoning.

*February 13, 2017*

**Math**

. The volume of a rectangular box is given by the expression V = (120 ? 6w)w2, where w is measured in inches. a. What is a reasonable domain for the function in this situation? Express the domain as an inequality, in interval notation, and in set notation. b. Sketch a graph of...

*February 13, 2017*

**American History-WWII US**

My Apologies Ms. Sue, Thank you for the Configurations.

*February 13, 2017*

**American History-WWII US**

Sorry Ms. Sue, I think there is a misunderstanding, I know all the Neutrality Acts, However, I am unable to know how all these acts connect together as the laws continued on.

*February 13, 2017*

**American History-WWII US**

How do the Neutrality Acts of 1935, 37, and 39 become less Neutral?

*February 13, 2017*

**calculus**

can someone also help me ndertsand this question ; y=x^3 +2x^2+3 represents the rate of an object over the interval [7, 10]. What is the average rate of the object over the time interval?

*February 13, 2017*

**calculus**

can someone help me with this problem y=x^2 -9 represents the velocity of an object over the interval [1, 5] in meters per second. What is the displacement of the object over the time interval?

*February 13, 2017*

**physics**

A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

*February 13, 2017*

**English composition **

Write a debate on the against the motion men should help at the kitchen

*February 13, 2017*

**value**

ACAR OF MASS 1200KG TRAVEL OF SPEED OF 20M PERSECOND IF ITS ENGINE DEVELOPS INTO 3KW,FIND THE FORCE USED

*February 13, 2017*

**math**

A skydiver jumps from an airplane at an altitude of 2,500 ft. He falls under the force of gravity until he opens his parachute at an altitude of 1,000 ft. Approximately how long does the jumper fall before he opens his chute? h(t) = -16t2 + vt + h0 A. 2.4 s B. 9.7 s C. 12.5 s ...

*February 13, 2017*

**physics**

A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)

*February 13, 2017*

**Math **

Can someone please help me understand box-and-whisker plots? I get really confused on what each thing is and how to plot it. Thanks.

*February 13, 2017*

**Science/Weather**

c

*February 13, 2017*

**physics**

calculate angular momentum and rotational kinetic energy of earth about its own axis

*February 13, 2017*

**Maths **

AB is a line segment and M is its mid point. Semicircle are drawn with AM,MB and AB as diameters on the same side of line AB. A circle (O, r) is drawn so that it touches all 3 semi circles . prove that r=1/6 AB.

*February 13, 2017*

**Maths **

Show that the mid point of line joining points (-5,12) and (-1,-12) is a point of trisection of the line joining the points (-8,-5) and (7,10).

*February 13, 2017*

**Social Studies**

Thanks , is 2. The largest portion of society , who owned a small amount of land.

*February 13, 2017*

**Social Studies**

1. What was described as the ' hardest work " slaves did ? ( 1 point ) A. work in the rice fields* B . Work in the tobacco fields C. Work in the lumber business D. Work loading and unloading ships in port 2. which of the follow best describes the social class of a ...

*February 13, 2017*

**Math**

You have to form a right triangle where the top of the cliff to the boat is the hypotenuse. Then to find how far the boat is from the foot of the cliff, you do cos(26.2)=a/90. To find how far the boat is from the top of the cliff, you do sin(26.2)=90/b.

*February 12, 2017*

**Math**

From the top of a Cliff 90metre high, the angle of depression of a boat on the sea is 26.2 degree.calculate how far the boat is from the from the foot of the cliff and from the top of the cliff

*February 12, 2017*

**Statistics**

Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6. Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be ...

*February 12, 2017*

**health**

The goal of health/safety education is...

*February 12, 2017*

**Physics Answer Check**

A note played by a musical instrument has a frequency of 130.8 Hz. What would be the length of the pipe if an organ pipe had this frequency as the fundamental and if the speed of the sound in the pipe is 350 m/s? f = v/2L 130.8(2L) = 350 2L = 2.68 L is about 1.34 m.

*February 12, 2017*

**math**

four times a number minus 8 is equal to two times the number plus 12

*February 12, 2017*

**Math**

Sorry It actually did

*February 12, 2017*

**Math**

The answer above didn't work

*February 12, 2017*

**Math**

Prove 3(x+1)(x+7)-(2x+5)² is never positive So, 3(x+1)(x+7)-(2x+5)(2x+5) =3(x²+8x+7)-(4x²+20x+25) =3x²+24x+21-4x²-20x-25 =-x²+4x-4

*February 12, 2017*

**math**

8 kilometer is how many meters

*February 12, 2017*

**Economics**

An article in The Wall Street Journal discusses a trend among some large U.S. corporations to base the compensation of outside members of their boards of directors partly on the performance of the corporation. “This growing practice more closely aligns the director to the...

*February 12, 2017*

**Managerial Economics**

An article in The Wall Street Journal discusses a trend among some large U.S. corporations to base the compensation of outside members of their boards of directors partly on the performance of the corporation. “This growing practice more closely aligns the director to the...

*February 12, 2017*

**Physcis 1315**

h=v?t+gt²/2, v=12 t=1 g=9.9

*February 12, 2017*

**Physcis 1315**

A ball is thrown vertically downward with a velocity of 12m/s How far has the ball fallen 1 s later?. 2s later?

*February 12, 2017*

**math**

Ann has $300 in a savings account that earns 1.75% simple annual interest. in how many years will she have$21 in Interest?

*February 12, 2017*

**Physics**

The angle between two vectors (F? and F?) is 90-28=62° The second angle of the force parallelogram is (360 -2•62)/2= 118°. Cosine law gives F=sqrt (F?² +F?² -F?•F?•cos118°)= 9.2 tan ? = (5+5.9•sin28°)/5.9•cos28° =1.49 ? = ...

*February 12, 2017*

**Chem**

Water was decomposed by the following reactions. Calculate the mass of HCl produced from 50.0 mL water assuming the following yields H2O=H2+O2 90% H2+Cl2=HCl

*February 12, 2017*

**Chem**

I need to do this using dimensional analysis

*February 12, 2017*

**Chem**

what mass of ammonia nh3 is necessary to react with 2.1 x 10^24 molecules of oxygen when ammonia reacts with oxygen to form water and nitrogen dioxide

*February 12, 2017*

**Math**

1. x+y = 9 2xy=40 x=9-y 2(9-y)y=40 y²-9y+20=0 y= 9/2 ±sqrt(81/4 – 20) y?=5, y? =4 => x?= 4, x?=5 2. x-y=4 x²+y² =208 x=4+y, (4+y)² + y² =208, y²+4y-96=0 y= - 2±sqrt(4+96) y?=8, x?= 12 , y? = -12 ( this root doesn’t meet ...

*February 12, 2017*

**physic**

The angular velocity is ?=v/R, the frequency is f= ?/2? the centripetal force is F=mv²/R

*February 12, 2017*

**Physics**

Work=Heat - internal energy W=A-U

*February 12, 2017*

**PHYSICS**

-------------a ....../1\..... ...../ 1 \.... B C

*February 11, 2017*

**PHYSICS**

--------------A /l\ / 1 \ / 1 \ / 1 \ 1 B C the pendulum has a string of .075m. velocity at c is 3.83m/s how do i find the speed at point b when the angle of B and C is 37 degree

*February 11, 2017*

***physics***

what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.

*February 11, 2017*

**Physics **

A car accelerates a form an initial speed to higher final sped while the engine puts out constant power. During this time period, magnitude of the car's acceleration was .. a increasing b decresing c constant d unpredictable please explain why also.

*February 11, 2017*

**English**

What did sodhi think of goeff

*February 11, 2017*

**n**

A ferris wheel is 20 meters in diameter and boarded from a platform that is 1 meters above the ground. The six o'clock position on the ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 6 minutes. The function h = f(t) gives your ...

*February 10, 2017*

**Math**

What is 7/3?

*February 10, 2017*

**math**

An open box is to be made from a square piece of material by cutting four-centimeter squares from each corner and turning up the sides (see figure). The volume of the finished box is to be 576 cubic centimeters. Find the size of the original piece of material.

*February 10, 2017*

**physics**

How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50?C to 50?C?

*February 10, 2017*

**Algebra**

In an infinite geometric progression with positive terms and with a common ratio |r|<1, the sum of the first three terms is (26/3) and the sum of the entire progression is 9. Determine the progression. Find the first term and common ratio

*February 10, 2017*

**Algebra**

Find the sum of the first five terms of an infinite geometric progression with a common ratio |r|<1 if the second term is (4/3) and the ratio of the sum of the squares of the terms of the progression to the sum of the terms of the progression is 3:1.

*February 10, 2017*

**social studys**

How did thjis all begin

*February 10, 2017*

**math**

What is the side length of the smallest square plate on which a 26?-cm chopstick can fit along a diagonal without any? overhang?

*February 10, 2017*

**Science**

1.A 2.B

*February 10, 2017*

**Science**

I meant burn

*February 10, 2017*

**Science**

although electromagnetic waves differ in the wavelengths they all travel at the speed of light which is A.300,00km/s B.6000km/h c.100km/s d.10,00km/s A rocket is a motor that can urn fuel without requiring A.water B.air c.electricity d.fire

*February 10, 2017*

**Health**

What are some ways to stay awake during studying for tests at night?

*February 9, 2017*

**cience**

Henry was given this cool toy for his birthday; he can use it to tell how fast someone is moving at that moment in time. The toy must calculate the person's

*February 9, 2017*

**Algebra II**

Determine if the binomial is a perfect square binomial. If so, show the original monomial squared. X^2 + 16 X^2 + 4

*February 9, 2017*

**Math/Chemistry**

ln(Ao/A)=kt => (Ao/A)=e^kt => Ao/e^kt=A => A=Aoe^-kt (1st order integrated rate law)

*February 9, 2017*

**Math/Chemistry**

This is from the 1st order integrated rate law => A = Aoe^-kt solve for Ao = A/e^-kt =Ae^kt (I showed solution for A in earlier post from (ln) function.)

*February 9, 2017*

**Chemistry**

Based on data given, Rate = k[NO2][F2]^1.2 Pick any row and substitute concentration and rate values. Solve for k. I got 115.4 M^-1.s^-1

*February 9, 2017*

**Algebra II**

Find the perfect square binomial x^2 + 16 Answer: x^2 + 4

*February 9, 2017*

**life orientation**

yah

*February 9, 2017*

**Social Studies**

That answer was wrong the right answer is farmers and aristocrats!!!!!!!!

*February 9, 2017*

**Social Studies**

Thanks Ms.Sue

*February 9, 2017*

**Social Studies **

In Chinese society, merchant class ranked below the 1. farmers and aristocrats 2. landowners and traders 3. aristocrats and priests ****** 4. bankers and farmers Please check my answer

*February 9, 2017*

**math HELP PLEASE**

What is the shaded area??

*February 9, 2017*

**science**

Thank You Cassandra. I made a 100 on my test .

*February 9, 2017*

**science**

The Sun is unusual because it does not belong to a ____ ? A) solar system B) universe C) galaxy D) binary star system I think the answer is D but I'm not 100% positive.

*February 9, 2017*

**20/15 in lowest terms.Express your answer mixed n**

I need answer for this question

*February 9, 2017*

**Social Studies nhf**

Thank you to anyone who answers this! I know it is long, but I want to make sure and positive that it is corect!

*February 9, 2017*

**Social Studies nhf**

The Two systems that move your body are the skeletal and the muscular systems. Muscles connect to your skeleton and they contract and move the skeleton along.

*February 9, 2017*

**Social Studies nhf**

Thank you! BTW, nhf stands for need help fast :) thank you again in advance!! All right! So, I have a few essay questions I want to make sure are right! This is really important to me and I am not that good in science. Please help me!! Here goes everything! (6 points) 1. ...

*February 9, 2017*

**history please help! Check my answers!**

What three products are columbia famous for???? 1.Beef, candy, sapphires 2. Tea, perfume and diamonds * or 3. cofee, flowers and emeralds *

*February 9, 2017*

**chemistry**

You need the Kb value for Ammonium Hydroxide to complete the problem. Kb(NH4OH) = 1.8 x 10^-5 Calculate the Ka for NH4^+ Hydrolysis reaction = Kw/Kb Set equal to the hydrolysis Ka expression for ... NH4^+ + HOH <=> NH4OH + H^+ C(eq) 0.10 - x x Ka =[NH^4OH][H^+]/[NH4...

*February 9, 2017*

**Maths**

Co ordinates of a point which isbat+3 diatancecfrom points(1,-3) of line 2x+3y+7=0 ?

*February 9, 2017*

**Math**

Thehe sum of the ages of Dorothy and Darlene is 41. In 5 years, Dorothy will be twice as old as Darlene. Find their ages 3 years ago.

*February 9, 2017*

**physics**

Well, perhaps that is the force the ball exerts on your hand?

*February 9, 2017*

**Math derivatives**

Develop a rule for the following: Dx[f(x)g(x)/h(x)]

*February 9, 2017*

**Math - Derivatives**

Find all points on the graph of y=1/4x^4+2/3x^3-5/2x^2+6x+7 where the slop of the tangent lins is 12.

*February 9, 2017*

**Physics**

A boat starting on one side of the river heads to the south with a speed of 1.5 m/s, the river flows to the east at .8 m/s. What is the resultant velocity to the side of the river? And if the river is 50 m wide calculate the displacement of the boat

*February 8, 2017*

**fractions**

I have 12 cookies I ate 3 how would I write what I ate in a fraction

*February 8, 2017*

**Math**

put a number into h and solve for v ex: h V 0 288 1 276 2 264 and so on.

*February 8, 2017*

**Social Studies**

Hello??

*February 8, 2017*

**Social Studies**

I pick number 3 am I right?

*February 8, 2017*

**Social Studies **

In Chinese society, the merchant class ranked below the 1. farmers and aristocrats 2. landowners and traders*** 3. aristocrats and priests 4. bankers and farmers Can someone please check my answer?

*February 8, 2017*

**math**

56/60 to get mile per min. 56/60*45 to get miles traveled in 45 min. 50/60/60 to get mile per sec 50/60/60*45 to get miles traveled in 45 sec. add the amount of 45 min and sec together to get final answer.

*February 8, 2017*

**math**

A car travels at a constant speed of 56 miles per hour. How far will it travel in 45 minutes and 45 seconds?

*February 8, 2017*