# Posts by peter

Total # Posts: 1,018

**Maths**

Joseph is four years younger than Mary, if three times Mary’s equal four times Joseph’s age, find: a) Mary’s age b) Joseph’s age

**Maths**

Joseph is four years younger than Mary, if three times Mary’s equals four times Joseph’s age, find: a) Mary’s age b) Joseph’s age

**Maxima**

Hi Reiny, sorry maxima is a computer algebra program that I use. I think my problem stems from the fact maxima takes angles in radians so I think I've probably got myself confused when trying to ensure the program is converting. Thank you for your help.

**Maxima**

Hello, I'm working on a problem involving the equation v=sqrt(6*9.8(sin x-0.2 cos x)) Using maxima I have a graph but since maxima uses radians I decided to put sin and cos values multiplied by pi/180 to get degrees. So I now have a graph which looks roughly right but I&#...

**Data**

a) Calculate the probability distribution for getting doubles within the first seven rolls of a pair of standard dice. b) Use these probabilities to estimate the expected number of rolls before getting doubles. How accurate is this estimate? How do I start?

**chemistry**

according to the data in the merck index,if 1,0g of aspirin is dissolved in 100ml of water at 37,how much aspirin will precipitate out of solution when it is cooled to 25.

**english**

Who am I? I am a national builder My favourite letter is K My favourite food is Japanese

**Data**

There are 52 white keys on a piano. The lowest key is A. The keys are designated A, B, C, D, E, F, and G in succession, and then the sequence of letters repeats, ending with a C for the highest key. a) If five notes are played simultaneously, in how many ways could the notes ...

**math**

there were 825 pupils in a school. 52 percent were boys. more boys joined the school and the percentage of boys became 64 percent of the new total. how many boys joined the school?

**Data**

You are making a string of coloured balloons as a decoration for the formal. If you have five green, six gold, and four white balloons, in how many ways can you arrange them along the string?

**Algebra **

Two cars leave town at the same time going in opposite directions. One travels 44 mi/h and the other travels 47 mi/h. In how many hours will they be 69 miles apart?

**Physiscs**

Hello, I have a doubt about inertia in a uniform bar and axis of rotation.. What's the difference between a lengthwise axis and a parallel one? In some books I have found that when we're talking about lengthwise axis that pass through the center of the bar the inertia ...

**Math**

an employee is paid $3600 for the first month. she is paid an additional 1% at the end of the second month, which means a total of $3636. she continues to receive a 1% raise each month for a full year. what is her total salary at the end of the year? answer is 45,648, how??

**Math**

The answer in my textbook says its $45,648.

**Math**

an employee is paid $3600 for the first month. she is paid an additional 1% at the end of the second month, which means a total of $3636. she continues to receive a 1% raise each month for a full year. what is her total salary at the end of the year?

**math**

The sum of the first 9 terms of an arithmetic series is 144, and the sum of the first 14 terms is 329. Find the first 4 terms of the series.

**Chemistry**

1) What volume of oxygen gas at 28 Celsius and 102 kPa is needed to react completely with 150 g of iron according to the following reaction. Fe(s) + O2 (g) FeO(s) 2) A bunsen burner is lit in a lab that at 24.7 Celcius and 1.07 atm. What mass of water is produced in the ...

**Math**

On his 12th birthday Enoch's grandparent's deposited $25 into a savings account for him. Each month after that up to and including his 20th birthday, they deposit $10 more than the previous month. How much money will Enoch have on his 20th birthday, excluding interest...

**Accounting**

What equation was used to get the answer in requirement 3? Consulting to control costs. Requirement 1. Compute Draper's predetermined overhead (OH) allocation rate for 2018. Estimated OH costs / Estimated direct labor costs = Predetermined OH allocation rate $198,000 / $...

**Math**

Help me Bobpursley is dumb Serge invests $700 at 5.75% per year, compounded quarterly. When the account is closed, its value will be $950. How long will Serge’s money be invested?

**Math**

It doesnt get me the right answer.

**Math**

Serge invests $700 at 5.75% per year, compounded quarterly. When the account is closed, its value will be $950. How long will Serge’s money be invested?

**Math**

Angelica ran in a half-marathon. The length of the race was 21.1 km. She ran 1700 m in the first 10 min of the race. In each 10-min interval after the first one, her distance decreased by 4%. How far did she run in the tenth 10-min interval?

**Physics**

An alloy of iron and silver has a total mass of 30 grams and a volume of 20.4 centimetre cube Calculate the mass of iron only and the volume silver only Please help

**Math**

However, sin(x)=0 at x=0 (high tide), and we want y to be at the center line 3 hours before high tide. So, shifting left 3 hours, we get y = 4sin(?/6 (x+3)) + 10 Can you explain how you got that part?

**Math**

I got the rest, can you help me with part e)? I'm not sure what it is asking... e) Compare your models. Which is the simplest representation if time is referenced to high tide? low tide? Explain why there is a difference.

**Math**

3. At the end of a dock, high tide of 14 m is recorded at 9:00 a.m. Low tide of 6 m is recorded at 3:00 p.m. A sinusoidal function can model the water depth versus time. a) Construct a model for the water depth using a cosine function, where time is measured in hours past high...

**Science**

I can dispense 300 liters of liquid continuously in one hour from a given temp. of 22*c down to 7*c. (delta T=15) How many liters and in what time can I dispense from a temp. of 24*c down to 3*c ? (delia T=21)

**Math**

How did you get your answer please tell me

**Math**

how did u get your answer?

**Math**

A support wire to the top of a newly planted tree is 15 m long. It forms an angle of 30 degrees to the ground. On the same side of the tree, a second wire is also attached to the top of the tree, but it makes an angle of 45 degrees to the ground. Determine an exact expression ...

**Gauss-Jordan elimination**

[1 1 1|7] [1-1-1|1] [1-1-]|3]

**Math**

5/9 ,7/18 and 1/2 arranged from the smallest to the largest

**Probability-Cards**

As shown above, a classic deck of cards is made up of 52 cards, 26 are black, 26 are red. Each color is split into two suits of 13 cards each (clubs and spades are black and hearts and diamonds are red). Each suit is split into 13 individual cards (Ace, 2-10, Jack, Queen, and ...

**CHE 111-03L**

The following system is at equilibrium: 2X(s)+4Y(g)⇌Z(g) Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or no shift in the direction of the net reaction. Half the Volume Remove Some X Double the Volume Add More X

**Math**

Write and expression that has a value of 100 and the following restrictions: 1. Uses each of the four operations at most once 2. Uses no parentheses 3. Use only the digit 3

**Art Study**

Thanks for nothing. You don't need a picture to know!

**Art Study**

What does the expression of this superhero mean? Which of the following steps of art critique are you conducting for this type of question? describe analyze present interpret I think B?

**math**

Mr. Vasil drove 405 miles on 15 gallons of gas. How many miles can he drive on 1 gallon?

**Math**

Denise bought some lace to sew around 3 square pillows. Each pillow measured 4 incheson each side. How many feet of lace did denise need for all 3 sides?

**Science**

Explain the measures toreduce the problems associated with mining and extraction of metal

**statistics**

A jar contains 2 red balls, 2 blue balls, 2 green balls and 1 orange ball. Balls are randomly selected, without replacement, until 2 of the same colour are obtained. Calculate the probability that more than 3 balls must be selected.

**math**

find the number that is twelve and a quarter times greater than its reciprocal<x

**CALCULUS**

State the intercepts, domain and range for y= |0.5x^2-2|.

**science**

percentage of water of crystallization in Fe(NO3)2

**algebra 1**

I'm so sorry, I made a mistake in the question!! It is the best measure of center for second period!! Shall I repost?

**algebra 1**

There is no outlier. I added one and the interquartile changed.

**algebra 1**

A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0 Second period: 3, 2...

**Algebra 1**

Wait please! I need another website! I still don't necessarily understand. I don't see any outliers. I know that an outlier would affect the median

**Algebra 1**

Hmm, then would it be D? Also, I am not guessing I am just unsure

**Algebra 1**

A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0 Second period: 3, 2...

**Calculus**

An observer 150 feet from point C, where a weather balloon has been released. The balloon rises vertically at a rate of 8ft/sec/. At the very instant the balloon is 250 above ground how far is it from the observer? How Quickly is it moving away from the observer at that moment...

**PHYSICS**

A 6.00g bullet is fired horizontally into a 1.50kg wooden block resting on a horizontal surface. The coefficient of kinetic friction between block and surface is .30. the bullet remains embedded in the block, which is oserved to slide .25m along the surface before stopping. ...

**Math**

An object's velocity after t seconds is v(t)= 38-2t feet per second. a. How many seconds does it take for the object to come to a stop (velocity = 0)? b. How far does the car travel during that time? c. How many seconds does it take the car to travel half the distance in ...

**Math**

Can you define the variable, four more than a number divided by 2 is ten.

**life orientation**

Give 3 human rights violation or discrimination

**Physics**

A girl standing on a stationary uniform plank 10m long. The plank can move with negligible friction along the surface of the water. A) the girl walks along the plank with a velocity of 2ms-1 relative to the plank until she reaches the end of the plank. The centre of mass of ...

**Physics**

The activity of a sample of 31Si (T1/2 = 9.43×103 s) is 7.88×105 decays per second. What is the mass of sample present?

**maths**

A vehicle travels equal distances at 60km/h and 90km/h.calculate its average speed

**algebra 1**

Given the data set (5, 9), (13, 12), (23, 16), which of the following equations best represents a line of best fit? y = three fourthsx − 7 y = four fifthsx + 7 *** y = three over twox + 7 y = two thirdsx − 7

**Math**

Determine whether or not the given linear transformation is invertible. If it is invertible, compute its inverse. (If the transformation is not invertible, enter IMPOSSIBLE. Use theta for θ.) Tθ:R2→R2, the reflection of the plane in the line formed by the angle...

**Linear Algebra**

Find the 3x4 matrix associated with the derivative transformation D:P3→P2 with respect to B = { 1, x, x2, x3} and B' = {1, x, x2}.

**Physics**

Plane A has radius of 6000km and a mass of 6E24kg. The plane B has a radius 1500km and a mass of 1.5E22kg. Which of the planetsame is more likely to have a large metal core?

**Pigskin geography week number 20**

Which team will visit a city within its own state for a game

**Math**

A clock starts at 12:59. What time is it after the minute hand rotates 24 degrees?

**Physics**

A uniform electric field with a magnitude of 6100 V m−1 points in the positive x direction. Find the change in electric potential energy when a +14 μC charge is moved 5 cm in the positive x direction. Answer in joules.

**Auburn**

How do you write 234,567 in roman numeral's

**Math**

The cost of fencing a square field at ₹ 27.50 per metre is ₹55000 . Find the cost of reaping the field at ₹45 per 100 metre² .

**Geography,maths literecy,life-science,agriculture,LO,sepedi and english**

Which career can suit me?

**Math**

Rafi had a board that was 15 1/2 FEET long he cut three pieces off the board that are each 3 and 7/8 feet long how much of the board is left

**physic**

If the gravitational force f is given by f= gm, m2/r^2 derive the dimensions of the constant g.

**physics**

A clown is rocking on a rocking chair in the dark. His glowing red nose moves back and forth a distance of 0.42m exactly 30 times a minute in a simple harmonic motion. (a) what is the amplitude of this motion? (b) what is the period of this motion? (c) what is the frequency of...

**physics**

How much would the time keeping of a pendulum clock be affected by taking it to the moon? Gravity is 1.6m/s ^2, compared with 10m/s ^2 on the earth.

**stat**

CI=2.86 ± 1.76*0.78/√15 =2.86 ± 0.3545 c) (2.51, 3.21)

**English - The Red Badge of Courage**

I have all the answers for the test. Its 1-19 but #19 is a short answer so ill do 1-18 a B C D A C B A A A B A C A D A C D

**physics**

What force is required to slide a 200 kg box up a 25 degree incline if the coefficient of friction is 0.60?

**math**

six years ago, jim was four times as old as Fe. In four years, he would be twice as old as fe.How old are they now?

**Physics**

The interior of a submarine located at a depth of 50 m in seawater is maintained at sea-level atmospheric pressure. Find the force acting on a window 20 cm square. The density of seawater is 1.03 × 103 kg/m3

**swagodimo**

Calculate the number of moles of hcl(aq)added to sodium thiosulphate

**Physics**

If the specific heat of ice is 0.5 cal/g degree celsius, how much heat must be released from 5 g of water at 0 degree celsius to change it to ice at -4 degree celsius?

**Algebra**

2. X - 7 > 10 X > ____ 3. 3x ≤ 21 X ≤ ____ 4.5a - 2 < 18 A<____ 5. 2t+8 ≥ -4(t+1) T ≥ ____ Could someone Please help me I have no idea how to do this

**Physics**

A gun shoots a bullet at 1200 m/s at an angle of 600 above the horizontal. Neglecting air resistance, determine: a.) its time of flight b.) its range

**Algebra**

Rewrite the set {x|2Ex<33:xEN} in roster form

**Ochem**

Write the equation for the reaction that occurs when sodium carbonate is added to the mixture of the reaction and water (hint: a gas is evolved). This is for benzocaine experiment

**Organic Chemistry**

Write the equation for the reaction that occurs when sodium carbonate is added to the mixture of the reaction and water (hint: a gas is evolved). This is for benzocaine experiment

**Organic Chem 2**

Write the equation for the reaction that occurs when sodium carbonate is added to the mixture of the reaction and water (hint: a gas is evolved). This is for benzocaine experiment

**Algebra**

How do I turn this into a algebraic expression, eight more than six times a number added to one more than nine times the number

**MATH**

Factorise 3k+1-3kh-h

**Physics**

Thanks Damon!!

**Physics**

The driver pushes the accelerator pedal as far down as possible. The car does not accelerate above a certain maximum speed. Explain the reason for this in terms of the forces acting on the car.

**algeb**

2) 100%-15% = 85% 85/100 = 0.85 26.86/0.85= sales price

**Physics**

A 2000 kg starts from rest and gains a velocity of 20 m/s in 5 s. What force wad applied on it?

**chs**

Two wires support an electricity pole. if the wires make angles of 58°and 67° with the ground and |AB|=21m, calculate the lengths of the wires

**Data management**

A card is drawn from a shuffled deck of 52 cards. What's th probability that the card is a spade or a face card?

**Math**

You have three toonies and two loonies in your pocket. You pull one coin out and then pull out another (without replacing the first) 1) show the total of all the probabilities is 1 2) show using combinations that part 1) is correct

**math**

5t^2-7t=1 find exact solution

**chem**

A 0.158 g sample of magnesium metal reacts completely with 100.0 mL of 1.0 M hydrochloric acid in a coffee cup calorimeter. The temperature of the solution rose from 25.6°C to 32.8°C. What is ∆Hrxn? Assume the specific heat of the solution is 4.184 J/mol-K and ...

**socialology**

Describe a situation in which you might see a gesselschaft community partnered with mechanical solidarity.

**english**

"I hope this song will help you to bring your country back to its stage it was and motivate to develop it more further. " this dialogue