Wednesday

January 18, 2017
Total # Posts: 1,734

**Chemistry**

Considering only the molecular orbitals formed by combinations of the s atomic orbitals in the valence shell, how many molecular orbitals can be formed by 5000 sodium atoms?

*June 15, 2016*

**Math trig**

Hello guys. I am just wondering if tan^2 A (tan squared A) = sin^2 A /cos^2A And 2tan A = 2sin A / 2cos A This has been bothering me when I have to simplify trig. Thanks in advance.

*June 1, 2016*

**Algebra 1**

An airplane travels for seven hours with a 60 mph tailwind on the return trip against the same wind it took the plane nine hours find the speed of the plane with no wind.

*May 30, 2016*

**Maths , logarithms**

Thank you Reiny Your answer is very clear and shows what I did wrong. Keep up the good work.

*May 29, 2016*

**Maths , logarithms**

Sorry it wasn't clear the problem was this 2^(2x+1) -9*2^2x = -4

*May 29, 2016*

**Maths , logarithms**

Hi bob For the first log problem , it was in a test and my answer was wrong , could it be a marking error?

*May 29, 2016*

**Maths**

2^2x+1 - (9)2^x = -4 Can someone please solve for x ? My answer is x= 2 , is this correct?? Please show your steps

*May 29, 2016*

**Maths , logarithms**

Can someone solve for x please. I don't understand it. 2^x . 7^x = log 14 My answer : 14^x = log 14 = log14÷log 14 = x X=1 Is this right????

*May 29, 2016*

**english**

Which of the following correctly defines blank verse? A. poetry with no structure or rhyme B. a type of long poem often used for plays C. a type of rhymed poetry Shakespeare uses throughout his plays D. unrhymed verse written in iambic pentameter i think it's A

*May 24, 2016*

**Math**

154lb person burns 420 calories per hour riding an exercise bicycle at a rate of 15 mi/hr. Write a function rule to represent the total calories burned over time by that person. Explain how the information in the problem relates to the function.

*May 20, 2016*

**Trigonometry**

A hinged crane which measures 19m makes an angle of 50° with the ground. A malfunction causes the lock on the hinge to fail and the top part (of 14.6m) of the crane swings down. How far from the base of the crane does the top hot the ground.

*May 19, 2016*

**math**

Can you help me? For the problem .6 is 266 2/3% of what number? would I change 266 2/3% to a decimal and put it over 100?

*May 14, 2016*

**Math Help please!**

11. A basket contains the following pieces of fruit: three apples to oranges two pairs two bananas and five peaches. Jack pics of fruit at random and does not replace it then, Bethany pics of fruit at random. what is the probability that Jack gets a peach and Bethany gets an ...

*May 9, 2016*

**math**

T =ƒaƒy+ beƒ{^- kt (Equation 2) where T is the temperature at time t, and a, b and k are constants with values a = 20 „aC, b = 80 „aC and k = 2.6 ¡Ñ 10ƒ{4 sƒ{1. Differentiate Equation 2 with respect to t and thus give values...

*May 5, 2016*

**Math**

A boy is trying to find the height of a tree. When he stands 95.5 metres away from the tree (the distance D in Figure 2) the angle shown as è in Figure 2 is 31.5°. The boy’s eyes are 1.15 m from the ground (h in Figure 2). What is the height of the tree? You ...

*May 5, 2016*

**Calculus**

Use the trapezoidal rule with n = 5 to approximate. Keep at least 2 decimal places accuracy. Integrate: (cos(x))/(x) from x=1 to 5

*May 3, 2016*

**Math**

A florist used 12 flowers to make a bouquet, including 4 daisies. What is the probability that a randomly selected flower will be a daisy?

*May 1, 2016*

**Software Engineering**

Consider the following program (written in pseudo-code) begin x:= 0; y:= 1; z:= 1; while y <= n do x:= x+1; z:= z+2; y:= y+z; od sqrt := x; end Prove the partial correctness of the program with respect to the following predicates: Pre: {n>=0} Post: {sqrt2 <= n and n &...

*April 21, 2016*

**World History**

Who was firends with Joseph Stalin?

*April 13, 2016*

**World History**

what was Joseph Stalin favorite music, and movies?

*April 13, 2016*

**Geometry**

2513.27 cm^2

*April 13, 2016*

**Geometry**

John bought a conical hat on a recent trip to central Vietnam. The basic frame of the hat is 16 hoops of bamboo that gradually diminish in size. The hat is covered in palm leaves. If the hat has a diameter of 50 centimeters and a slant height of 32 centimeters, what is the ...

*April 13, 2016*

**math**

the first, second, and third terms in the geometric progression are k,k-6, 2k-28 respectively. given that all terms of the geometric progression are positive, calculate the value of constant k.

*April 13, 2016*

**algerbra**

a rectangle with width 2x+5 inches has an area of 2x^4+11x^3-5x^2-98x-120 square inches. Write a polynomial that represents its lenght

*April 11, 2016*

**Math**

For this problem (2)^0 (-2)^0 would I add the exponents? I f so what do I do with 2 and -2?

*April 9, 2016*

**Calculus**

Function is y=x2 . Take three points, x=2, x=3, x=4. Approximate this function at these three points for a deviation Δx =0.1. Which of the three points does the approximation works best? Which point does it works worst?

*April 6, 2016*

**English**

whats the answer

*March 31, 2016*

**Math**

It is 393

*March 29, 2016*

**College Physics**

A student of mass M = 82 kg takes a ride in a frictionless loop-the-loop at an amusement park. The radius of the loop-the-loop is R = 15 m. The force due to the seat on the student at the top of the loop-the-loop is FN = 696 N and is vertically down. What is the apparent ...

*March 17, 2016*

**Physics**

A jet plane is flying at a constant altitude. At time t1=0 it has components of velocity Vx=90m/s, Vy=110m/s.At time t2=30.0s the components are Vx=-170m/s, Vy=40m/s.a).Sketch velocity vectors at t1 and t2.How do these two vectors differ?. For this time interval calculate b). ...

*March 6, 2016*

**Math**

can someone answer this ?

*March 5, 2016*

**calculus**

just wanted solutions and maybe working out as my previous year exams papers don't come with solutions. So I cant compare to see if I got it correct or not.

*March 5, 2016*

**calculus**

a) Let f(z) = z^2 and γ(t) = 1 + it^3, t ∈ [0,1]. i) Write out the contour integral ∫γ f(z)dz as an integral with respect to t. You do not need to evaluate this integral. ii) Evaluate the integral ∫0,1+i z^2dz iii) What is the relationship between ...

*March 5, 2016*

**calculus**

Thank you. Just wondering why 3T can be 3 pi, 5 pi, pi. Also just need c and d.

*March 3, 2016*

**calculus**

a) Obtain all solutions of the equation z^3 +1 = 0 b) Let z = x + iy. Obtain the real and imaginary parts of the function f(z) = 1/1+z c) Let f(x + iy) = x^2 - y^2 + iv( x,y). Determine a function v such that f is differentiable in the whole complex plane. Express f as a ...

*March 3, 2016*

**Physics**

A string under a tension of 43.0 N is used to whirl a rock in a horizontal circle of radius 2.25 m at a speed of 20.0 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string on the table is 1.00 m...

*March 2, 2016*

**Quick Citation Question**

I am citing books in MLA format and I am wondering about the publisher. If the publisher is: Smith and John Publication, Inc. Do I include the "inc." part with the period?

*February 26, 2016*

**Algebra**

A balloon is secured to rope that is staked to the ground. A breeze blows the balloon so that the rope is taut while the balloon is directly above a flag pole that is 30 feet from where the rope is staked down. Find the altitude of the balloon if the rope is 100 feet long. ...

*February 21, 2016*

**geography,life science, business and maths lit**

Can i study sport science or land survey with this subjects?

*February 19, 2016*

**Math**

8*6=48\3=16

*February 15, 2016*

**Physics**

You are in the supermarket, pushing a cart with a force of 92 Newtons in the horizontal direction. There is a constant force of kinetic friction operating on the cart of 16.8 Newtons. Calculate the net work done on the cart, if the cart is displaced 5.6 metres in a straight line.

*February 11, 2016*

**Science**

You drop a ball, mass 117.1 grams from a height of 68.9 cm. It bounces back to a height of 48.1 from the floor. What is the change in gravitational potential energy from the moment it is dropped, to the moment it reaches the maximum height from the bounce?

*February 11, 2016*

**Science**

1.A 2.B 3.C 4.A You will get 100%

*February 11, 2016*

**Science**

So what is the answers??

*February 11, 2016*

**math**

Yasmin lives 400m from Anton.Kevin lives 0.45km from Anton.Jared lives 40 000mm from Anton.who lives closest to Anton?how do you know?make sure to show your work?

*February 8, 2016*

**Precalc**

Taxes on a house assessed at $64,000 are $1500 a year. If the assessment is raised to 85,000 and the tax rate did not change, how much would the taxes be( round to two decimal places)

*February 7, 2016*

**Maths**

A glass is designed in the shape of a cylinder. it has a radius 5cm, and holds 1 litreof liquid, what's the height of the glass

*February 4, 2016*

**Calculus(PLZ HELP)**

That website isn't helpful since the problem is a box cross sectional problem. But thank you for trying to help

*February 2, 2016*

**Calculus(PLZ HELP)**

A serving bowl has an inside diameter of 12 inches and a depth of 4 inches. The bowl is fashioned from part of a sphere. Find the capacity (volume) of the bowl.

*February 2, 2016*

**Grade 5 math**

Sidney flew in an airplane five times during her vacation.The flights averaged 2 hours 8 minutes long.The lengths of her first four flights were 2 hours 10 minutes,3 hours 20 mins,1 hours 15 minutesand 2hours 40 minutes.What was the length of her last flight

*February 1, 2016*

**Science**

What is the centripetal acceleration a satellite is orbiting the Earth at an altitude of 300.22 km?

*February 1, 2016*

**Physics**

dont be a dick bob

*January 31, 2016*

**History**

d for dick

*January 31, 2016*

**physics**

Imagine a parallel universe in which the electric force has the same properties as in our universe but there is no gravity. In this parallel universe, the sun carries charge Q, the earth carries charge −Q, and the electric attraction between them keeps the earth in orbit...

*January 31, 2016*

**physics**

An electron is projected with an initial speed of (1.90x10^6 m/s) into the uniform field between two parallel plates. Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the ...

*January 31, 2016*

**Math**

Actually, rounding to the nearest whole number is incorrect. For example, 24 4/7 rounds up to 25, not the best number to divide by 4 to get your estimate. What you need to do is to find the nearest number (up or down) that is compatible with 4. So in this case, 24 4/7 would ...

*January 23, 2016*

**Maths**

The scale of a map is 1:500. Find the length of a road in real life if it is 6cm long on the map

*January 23, 2016*

**Language arts**

based on the text preview as well as research about the background of the novel and the author's life a reader can predict that the novel will most likely be about Deez nuts HA GOT EM

*January 20, 2016*

**Social studies**

Hey ms. sue . I went to the link that you put in here but I didn't see what I was looking for? could you pls help me>

*January 18, 2016*

**Math**

I need help please. Assume that one dollor is equal to 1.14 euros. If 500 g of an item is selling for 25 euros, what is its price in dollars per kg?

*January 14, 2016*

**Algebra**

write equation of given translation of y=|x| 1 unit down 5 units right 10 units left 4 units up 6 units left

*January 4, 2016*

**Math -Algebra**

write equation of given translation of y=|x| 1 unit down 5 units 10 units left 4 units up 6 units left

*January 4, 2016*

**MATHS HELP URGENT(TIME AND WORK)**

A can do a piece of work in 12 days whereas B can destroy the work in 3 days. A does the work for 10 days and then B destroys the work up to 2 days. In how many days will the work be finished?

*January 1, 2016*

**math**

You need 4 more ounces

*December 30, 2015*

**Algebra 2 (Math)**

Divide 3x^3 + 3x^2 + 2x – 2 by x + 3 using long division. Check my answer please. 3x^2 – 6x + 20 3x^2 + 12x – 16 3x^2 + 12x – 16, R 58 3x^2 – 6x + 20, R -62 (I think that it's this one)

*December 22, 2015*

**science**

D. Firecrackers are converted to thermal energy when they burn.

*December 5, 2015*

**Physics**

You jump from a height of 1.0m from the surface of the Earth. The Earth will actually move a bit as you land. a.) Explain Why b.) Estimate the distance the Earth moves, listing any assumptions you make

*December 2, 2015*

**social studies**

K thank you

*November 30, 2015*

**social studies**

How did Muslim Turks influence turkey's development?

*November 30, 2015*

**Social Studies Check My Work**

People can do what they want... who cares if its a quiz in CCA? Btws 3,4,7 are all wrong and if you submit her answers you get a 70% (I learned that by experience xD)

*November 25, 2015*

**Social Studies Check My Work**

People can do what they want... who cares if its a quiz in CCA?

*November 25, 2015*

**Chemistry**

you have 5% formic acid solution and a 5% acetic acid solution. You titrate 5mL each with .1868M NaOH. A. Which will need more NaOH to reach the end point? B. How much more?

*November 24, 2015*

**math**

What is the expected value of the cost of of claims on a males drivers policy? Note: number of drivers is 9634 number of claims is 977 and the average cost per claim is 6108 euro

*November 23, 2015*

**Physics**

A small rock with mass m moves at velocity v0 and hits a rod of mass M as shown. The rod is initially at rest. The collision is completely inelastic. a) What is the angular velocity of the rod after the collision? b) What is the maximum angle the rod makes with the vertical?

*November 23, 2015*

**Algebra II**

How can you completely factor the following polynomial: 6x^5-51x^3-27x

*November 18, 2015*

**chem**

Calculate the equilibrium concentration of NH3,Cu^2+,[ Cu(NH3)]^2+ ,[Cu(NH3)2]^2+,[Cu(NH3)3]^2+,and[Cu(NH3)4]^2+ in a solution made by mixing 500.0 ml of 3.00 M NH3 with 500.0 ml of 2.00*10^-3 M Cu(NO3)2. The sequential equilibria are Cu^2+ +NH3---->[Cu(NH3)]^2+ ka1=1.86x10...

*November 17, 2015*

**chem**

Thanks!

*November 17, 2015*

**chem**

the following experiment was performed in the laboratory : an excess of solid SrCrO4 is vigorously shaken in water until a saturated solution is obtained. The excess solid is filtrated from the solution and 25.00 ml of the solution is titrated with 0.0115 M fe(no3)2 solution. ...

*November 17, 2015*

**Physics**

A block is on the end of a massless cable that is tied to a frictionless wheel (uniform disk) as shown in the figure at right. The wheel has a radius of 0.4 m. The system is initially at rest. If the block moves downward, with a constant acceleration, a distance of 2 m in 3 s...

*November 17, 2015*

**Chemistry**

You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of 0.13 M calcium ...

*November 14, 2015*

**physics**

How did you get three? .-.

*November 12, 2015*

**physics**

Upwards

*November 12, 2015*

**physics**

A stone is thrown from a height of 1.8 with a velocity of 29.4. How long does it take to reach its greatest height? I'm sure it has something to do with the s=ut+1/2 at squared not sure though

*November 12, 2015*

**Marie Ernestine**

Math/Science A car starts from rest and moves at the speed of 30 kph after half an hour. What is the cars acceleration?

*November 11, 2015*

**science help ASAP**

The answer for the first one is correct and the answer for the second one is D.

*November 10, 2015*

**physics**

Any ideas? A bird flying at 3m/'s west is given an acceleration of 1ms after five seconds what I'd it's velocity and how far has it travelled from its starting point?

*November 5, 2015*

**physics**

Got the answer it's basically 5-2/2.1=1.43s

*November 5, 2015*

**physics**

Relating to the first question. How long did it take to do this?

*November 5, 2015*

**physics**

Thanks. I understand it now. But we have like set formulas in our tables for incidence like v=u+at etc. I have learnt the changing velocity over time but in a test situation would I have to use the formulas given or the method appove?

*November 5, 2015*

**physics**

So basically I got this question and it's baffling. Over a distance of 5m the speed of a bicycle increase's from 2ms to 5ms what I's the magnitude of acceleration?

*November 5, 2015*

**Social Studies**

Yeah what is the second answer

*November 5, 2015*

**Math**

A boat pilot wishes to go in a straight line across a river from the east dock to the west dock in a ferryboat that has a still water speed 8.0 knots. If the river has a Southward current of 2.5 knots, what compass heading should be maintaned while crossing the river? What is ...

*November 3, 2015*

**math**

189

*October 25, 2015*

**kon**

can someone edit my essay?

*October 24, 2015*

**history**

what event convinced south Carolina to spend representatives to the first continental congress ? A. passage of the currency act B. passage of the intolerable act C. passage of the navigation act D. passage of the stamp act is it D

*October 20, 2015*

**calculus**

find the first and second derivatives for 3x^4-4xy^2+7=2y

*October 14, 2015*

**Algebra 1**

A drama club wants to raise at least $500 in ticket sales for its annual show. The members of the club sold 50 tickets at a special rate of $5. The usual ticket price the day of the show is $7.50. At least how many tickets do they need to sell the day of the show to meet the ...

*October 11, 2015*