Wednesday

December 7, 2016
Total # Posts: 667

**Physics**

Two identical loudspeakers are 2 m apart. A person stands 4.6 m from one speaker and 3.4 m from the other. What is the lowest frequency at which destructive interference will occur at this point?

*November 22, 2016*

**MATHS**

Find all possible solutions in the range 0°? x ? 180° of the following equations: (a) cos x = sqrt(2) / 2 (b) tan x = sqrt(3) / 3 (c) sin x = sin60° (d) cos x = -1/2 (e) sin x = -1/2

*November 21, 2016*

**maths**

for a teacher you have a bad attitude. FIX IT!!!!!!!

*November 7, 2016*

**maths**

a shape ABCDE is made up of an isosceles triangle and a rectangle. The perimeter of ABCDE is 46cm. What is the length of AB?

*November 7, 2016*

**maths**

A shape ABCDE is made up of an isosceles triangle and a rectangle. The perimeter of ABCDE is 46cm. 1) what is the length of AB?

*November 6, 2016*

**maths**

A shape is made up of a triangle and a rectangle. The perimeter of ABCDE is 46cm. What is the length of AB?

*November 6, 2016*

**maths**

thank u Ms. Sue

*November 3, 2016*

**maths**

90 marbles are shared among 3 friends. Dave gets 10 more than Lall, who gets 10 more than lee. How much does dave get?

*November 3, 2016*

**maths**

karim has $15 more than Jack. Together they have $55. How much does each person have?

*November 3, 2016*

**maths**

kay has $15 more than kim. Together they have $55. How much does each person have

*November 3, 2016*

**maths**

Three numbers add up to 180. The second number is twice the first, and the third number is three times the first. WHAT IS EACH NUMBER?

*November 3, 2016*

**maths**

the net of a cube has an edge of 5cm. calculate the perimeter

*November 2, 2016*

**maths**

A farmer bought 3 1/2 dozen eggs. Fourteen were bad. a) what fraction were bad? b) What percentage were good? c) If the eggs cost $18.00 per dozen. How much did he pay for the eggs?

*November 1, 2016*

**maths**

david gave 1/5 of his oranges to his brother. his brother got 15 oranges. he gave his friend donny 1/3 of the remainder. a) how much oranges did david have originally? b) how many did donny get? c) how many oranges was david left with?

*November 1, 2016*

**math**

209.25

*October 31, 2016*

**math**

Saha spend 55% of her savings on a game. She has $135 remaining. how much was her savings before buying the game

*October 31, 2016*

**math**

the number has 5 digits the value of the largest digit is 90,000 the value of the thousands place is the same value in every place the sum of the hundreds place and the tens place is 7 the value of the smallest value is 4 97,774

*October 25, 2016*

**maths**

What is the length of an arc of a circle that subtends 2 1/2 radians at the centre when the radius of the circle is 8cm

*October 17, 2016*

**science**

Two concentric conducting spherical shell have raddii R1=0.145m and R2 =0.207m. The inner sphere with negligible speed. Assuming that the region between the sphere is a vacuum, compute the speed with which the electron strikes the outer sphere.

*October 5, 2016*

**algebra**

Just go into old lessons and write down notes. Then make up problems and practice. IF you need help, you should try Khan academy.

*September 30, 2016*

**algebra**

Khan Academy should help.

*September 30, 2016*

**algebra**

Guessing connections academy or homeschool? Please, they do not want you to cheat, my friend.

*September 30, 2016*

**Algebra 1 **

Emmanuel was speaking with a friend from another country. His friend told him that the speed limit on most highways is 100 kilometers per hour in her country. This speed sounded fast to Emmanuel. Approximately what speed is this in miles per hour? Round to the nearest whole ...

*September 26, 2016*

**Math**

If two fair dice are rolled, find the probability that the sum of the dice is 6, given that the sum is greater than 3.

*September 22, 2016*

**Math**

The scale of a road map is 1 cm to 4 km.if the church and the city hall are 4 cm apart on the map.how many km apart are they in actual distance

*September 20, 2016*

**Chemistry**

What is the concentration of a monoprotic weak Acid if its pH is 5.50 and its Ka= 5.7 x 10^-10?

*July 28, 2016*

**math**

the sum of two numbers is 25. the second number is 5 more than the other one. find the numbers.

*July 23, 2016*

**PHYSICS **

on a partime job you are asked to bring a cylindrical iron rod of legnth 85.8 cm and diameter 2.85 cm from a storage room to a machinist. will you need a cart? (to answer calculate the weight of the rod.)

*July 22, 2016*

**math**

the product of three numbers is 315.if two of the numbers are 7 and 9 .what is the third number?

*July 20, 2016*

**Object Oreinted Programming in java**

write a program that Enter price item,Enter No: of Items and Total Due of Items.Subtract 0.5 to TotalDue and , Print The total Amount.

*July 4, 2016*

**physics**

a uniform rod 100cm long and weighing 50N is supported in a horizontal position on a fulcrum with weights 80N and 100N suspended from its end. compute the position of a fulcrum.draw the illustration.

*July 4, 2016*

**Math**

Find the standard equation of the circle concentric with x^2+y^2-12x-10y = -12 and has a diameter of 10. I have been trying to solve this all day, can you please help me :(

*June 27, 2016*

**Physics**

A circuit employs a silicon solar cell to detect flashes of light lasting 0.25 s. The smallest current the circuit can detect reliably is 0.32 μA . Assuming that all photons reaching the solar cell give their energy to a charge carrier, what is the minimum power of a ...

*May 6, 2016*

**math**

Cynthia has a bag of jellybeans. There are two red jellybeans, one yellow jellybean, and two black jellybeans in her bag. Cynthia grabs two jellybeans and gives them to her friend, Pedro, and he eats them. What is the probability that she gives him two red jellybeans?

*May 3, 2016*

**Physics mechanics**

Two identical 17.7-kg balls, each 23.9 cm in diameter, are suspended by two 35.0-cm wires as shown in the figure (Figure 1) . The entire apparatus is supported by a single 18.0-cm wire, and the surfaces of the balls are perfectly smooth. what is the tension in the top wire?

*February 8, 2016*

**math**

two boats p and q are at points whose position vector are 4i+8j and 4i+3j respectively. both of the boats are moving at a constant velocity of p is 4i+j and q is 2i+5j. find the position vectors of p&q and pq after t hours, and hence express the distance between p and q ...

*February 6, 2016*

**Math**

20 black tiles

*February 6, 2016*

**chemistry**

200cm3 of each of 0.1m of solutions of lead (ii) trioxonitrate (v) and hydrochloric acid were mixed. Assuming that lead (ii) chloride is completely insoluble, calculate the mass of lead (ii) chloride that will be precipitated.

*January 8, 2016*

**fourth grade math**

After making a dot plot, Julie asked Kevin what size shoe he wore. She then added together the total of all the shoe sizes including Kevin's. The total was 139. What size shoe does Kevin wear?

*January 7, 2016*

**trigonometry**

Nikki bought a triangular lot whose sides are 9 meters, 12 meters, and 15 meters long. if it cost her 3500 pesos per square meter, how much did she pay for the lot?

*December 28, 2015*

**Health**

You may need to see a doctor if ________.

*December 15, 2015*

**Health**

How long do anxiety disorders last? A .at least two years b. at least one year c. at least 6ix months d. at leaks 6 weeks D?

*December 15, 2015*

**Physics**

The temperature of 2.0 g of helium is increased at constant volume by ΔT. What mass of oxygen can have its temperature increased by the same amount at constant volume using the same amount of heat? I know for constant volume I should use the equation: Q=mCsubvdeltaT I ...

*December 2, 2015*

**scale drawing**

the distance betw two towns on a map is 15cm calculate the ground distance if the scale of the map is 1:50,000

*November 17, 2015*

**math**

I am having problems starting of the equation . I understand how to do it but have a hard time setting it up correctly.

*November 16, 2015*

**math**

a rectangle has a width of one less than the length . if the perimeter is 30 units , what is the length and width ?

*November 16, 2015*

**math**

according to information from NASA, the space shuttle has a capacity of about 500,000 gallons of fuel. Write three numbers that could represent the space shuttle's actual fuel capacity? I don't understand the question.

*November 11, 2015*

**math**

if a person walks 2.4 miles in 1.5 hours, how far can he walk in 3hours

*November 10, 2015*

**math**

Ms.Sue I did $10 divided by 4.5 pounds to get 2.22222 repeating. i rounded it and got 2.22 dollars

*November 10, 2015*

**math**

if 4.5 pounds of cherries cost $10, what is the unit price per pound

*November 10, 2015*

**math**

Ms.Sue i still don't get this problem may u explain

*November 10, 2015*

**math**

If a person walks 2.4 miles in 1.5, how far can he walk in 3 hours

*November 10, 2015*

**Science**

pH values of 12,6,10.5 and 4.3.which of these is acidic and basic

*October 30, 2015*

**Math **

Which of the following is equal to the expression below?

*October 28, 2015*

**math**

A merchant purchased a number of coats, each at the same price, for a total of $720. He sold them at $40 each, thus realizing a profit equal to his cost of 8 coats. How many did he buy

*October 15, 2015*

**math**

It takes B 6 hours longer than A to assemble a machine. together they can do it in 4hr. how long would it takes each worker alone to do job

*October 15, 2015*

**MATH HELP PLEASE**

math

*October 9, 2015*

**Programming**

using c++ write a program that accepts the unit weight of a bag of coffee in pounds and the number of bags sold and display the number of bags sold ,the weight per bag price per pound sales tax and total price of the sale.the unit of a bag of coffee is valued as $5.99 pound ...

*October 7, 2015*

**Science**

he is right

*October 7, 2015*

**Physics**

Horse canters away from its trainer in a straight line moving 130 m away in 16.0 s. It then turns abruptly and gallops halfway back in 4.3 s? (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the trainer" as the...

*October 6, 2015*

**MATH **

Hey we almost have the same name!

*October 6, 2015*

**Mathematics **

two brothers Peter and Paul owns a store. if there share ratio of store value 3 ratio 5, later peter sold 2/3 of his share to Paul for 8000 naira. what is the value of the goods in the store.

*September 30, 2015*

**reading**

30-day Money Back Guarantee Groom Co. electric shavers come with a 30-day money back guarantee. The only stipulation is that you use your new exclusively for 2 weeks to become accustomed with the product. If you are not satisfied, we will refund the amount on your receipt if ...

*September 27, 2015*

**english**

???

*September 27, 2015*

**english**

30-day Money Back Guarantee Groom Co. electric shavers come with a 30-day money back guarantee. The only stipulation is that you use your new exclusively for 2 weeks to become accustomed with the product. If you are not satisfied, we will refund the amount on your receipt if ...

*September 27, 2015*

**Statistics**

If 50 classes of 20 students are randomly selected, what is the probability that 10 classes have no left handed students? I know it is binomial distribution but i do not get it

*September 8, 2015*

**Early Literacy**

Preschoolers usually begin to add tag endings, such as "huh?" and "okay?" to their questions around age:

*June 3, 2015*

**Math**

If 7 1/4 boxes of parts weigh a total of 68 7/8 pounds, what does one box of parts weigh?

*May 30, 2015*

**American Government**

The voting rate among 18 - 24 year olds in 2004:

*May 25, 2015*

**American Government**

The fourth branch of government refers to

*May 25, 2015*

**math**

Tess’ commission is increased according to how much she sells. She receives a commission of 6% for the first $5000 and 12% on the amount over $5000. What is the total commission on sales of $12,000?

*April 26, 2015*

**Engineering Physics 1**

I shot the first arrow Into the air with a speed of 10 m/sec , 1 second later I shot the 2nd arrow into the air with a speed of 15 m/sec. Will they meet? If so, where? how do i solve this?

*April 26, 2015*

**benedicta**

tap A takes 12min to fill a tank with water tap B takes 15min to empty the same tank if the two taps are open at the same time how long will it take

*April 23, 2015*

**ss**

the aztec capital of tenochtitlan stood on the present-day A.Los Angeles B.Panama City C.Mexico D.Tikal

*April 17, 2015*

**math**

about the same amount of rain fell 2 months ago like last month

*April 13, 2015*

**geometry**

A train in the mountains rises 10ft for every 250ft it moves along the track. Find the elevation of the track.

*March 25, 2015*

**physics**

An iron cube of volume 800cm is totally Immersed in water calculate the upthrust

*March 19, 2015*

**Art**

yes i go to connections

*March 16, 2015*

**math**

Not sure where you got 360 from?

*March 5, 2015*

**Religion**

God does this so when he makes all things right and new he gets the glory, i know that sounds weird but look at the holocaust all those Jews who died most of them went to heaven then he set them free, then he gave them isreal back. i was in a car accident i broke my collar ...

*March 4, 2015*

**Health**

Miss Nancy, those are all wrong. I took the test.

*February 27, 2015*

**social studies 8 ANSWER PLEASE!!!!!!!!**

The National Road

*February 5, 2015*

**Chem Uni. Urgent!!!**

Thanks a lot, I obtained 0.85 g as well. Concerning the 0.50g, few crystals were lost during handling.

*February 3, 2015*

**Chem Uni. Urgent!!!**

Have to find theoretical yield of recrystallization of acetanilide from water. 1 gram of crude product used (85% acetanilide, 14% Sodium chloride and 1% charcoal) I got 0.50 grams of purified product. With percent recovery of : (0.50g/1.00g)* 100% = 50%. How do I find the ...

*February 3, 2015*

**Math**

.248... is the volume of the basketball in ft^3. A cubic foot has 1 ft^3 of volume. Subtract .248 from 1 ft, you get .7515 ft^3 Multiply .7515 by 62.4 lb = 46.895 lbs

*January 30, 2015*

**Calculus**

Determine the interval(s) at which f(x) is concave up given that f′′(x)=−x2+x+6. a) (–2, 3) b) (–∞, –2), (3, ∞) c) (–∞, –3), (2, ∞) d) (–2, ∞) e) (–∞, 3)

*January 30, 2015*

**Calculus **

Determine the interval(s) at which f(x) is concave up given that f′′(x)=−x2+x+6. Critical points are: -2 & 3

*January 30, 2015*

**Ionic compounds Scinece**

3. What happens to the change on individual ions when they form ions? 11. Write the names of the two ions in each of the following compounds. (C) Na2O (E) Na3PO4 (G) NH4OH (H) Ca (NO3)2 8. Use the tables of metals, non-metals, and polyatomic ions and the Periodic table to name...

*January 22, 2015*

**Chemistry**

Perchloric acid, HClO4, is a strong acid. What are the pH values of the following solutions: a) 3 M perchloric acid b) 0.1 M perchloric acid c) 0.001234 M perchloric acid d) 10-5 M perchloric acid e) 10-9 M perchloric acid is the pH -log(conc. ?

*January 19, 2015*

**Chemistry**

a solution of HCL is approximately 0.1M and has to be standardized . 1.234g Na2CO3 are dissolved to make 100ml of solution. 20mL of this solution are titrated with the HCL solution, requiring 31.3mL for the second equivalence point. what is the exact concentration of the HCL ...

*January 14, 2015*

**Chemistry**

Draw the pH-titration curve for the following, label x and y axes accordingly. 10 mL of 0.1M H3PO4 with 0.1 M NaOH (Logk values = 2, 7, 12) I understand that the x-axis is mL of H3PO4 added and y-axis is the pH. But the logK values, is that the equiv-points for the tri-protic ...

*January 14, 2015*

**Chemistry (Chromatography)**

Comment on the order of elution of the following solutes in (a) normal phase and (b) reversed phase liquid chromatography. Give reasons why. Solute X - non-polar Solute Y- Polar, a dipole Solute Z - Polar, more polar than solute Y I understand that polarity is the reason of ...

*January 13, 2015*

**Chemistry (Chromatography)**

In elution chromatography (Ion-exchange) outline the order of elution for the following cationic species: Cu2+, Fe3+, Ag+ and Na+? I understand it has to do with polarity, but in which sense i.e does the least polar/most polar species elute first? Thanks

*January 13, 2015*

**Chemistry**

Thanks for the time and help, this was my final working out, don't know if you will receive this, so once again thank you. Step 1: moles Na2CO3 = 1.234g/105.89 g/mol = 0.0116 mol. Step 2: 20mL of Na2CO3 = 0.0116*(20/100) = 0.00232mol/L Step 3: Balanced equation = Na2CO3 + ...

*January 9, 2015*

**Chemistry**

a solution of HCL is approximately 0.1M and has to be standardized . 1.234g Na2CO3 are dissolved to make 100ml of solution. 20mL of this solution are titrated with the HCL solution, requiring 31.3mL for the second equivalence point. what is the exact concentration of the HCL ...

*January 9, 2015*

**PHYSICS**

A 209 kg block is released at height h = 3.3 m as shown. The track is frictionless except for a portion of length 7 m. The block travels down the track, hits a spring of force constant k = 1545 N/m, and compresses it 1.9 m from its equilibrium position before coming to rest ...

*December 10, 2014*

**physics**

A student, late for class, ran up some stairs between landings, which are 11.3 m apart. The student’s mass is 62 kg and it took 6.02 s to do the run. What is the average power that the student generated during the run?

*December 10, 2014*

**Math**

What are the comparisons between the mixed numbers 5.815 and 6.021

*December 10, 2014*

**Math**

I don't know the answer

*November 28, 2014*