# Posts by Alexander

Total # Posts: 154

**chemistry**

The combustion of ethane produces carbon dioxide and water. If 27.6 g C2H6 are burned in the presence of excess air (O2) and 76.7 g of carbon dioxide are produced, what is the percent yield?

**Mathematics **

6 black counters and 4 white counters in bag A. 7 black counters and 3 white counters in bag B. 5 black counters and 5 white counters in bag C. Tarek takes at random a counter from bag A and puts the counter in bag B. He then takes at random a counter from bag B and put the ...

**Math**

The length of a rectangle is 8 feet more than its width. If the width is increased by 4 feet and the length is decreased by 5 feet, the area will remain the same. Find the dimensions of the original rectangle.

**Math**

Try making a chart

**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 ...

**General 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 ...

**Science**

I got the question, never mind.

**Science**

How much work is done in moving a 25lb. load a distance of 7 feet?

**Math**

What is 0.554 rounding to nearest tenths ones hundredths and 8.497

**Maths**

The size of a parcel despatched through the post used to be limited by the fact that the sum of its length and girth (perimeter of the cross section) must not exceed 6 feet. What was the volume of the largest parcel of square cross- section which was acceptable for posting? (...

**Engineering**

4. A rectangular enclosure is formed by using 800m of fencing. Find the greatest possible area that can be enclosed in this way and the corresponding dimensions of the rectangle.

**%Math**

13 choose 9 13!/(9!*4!)

**Math**

Louisa has many marbles in a bag. When she counted them by twos, threes, fours, fives, sizes, sevens, eights, nines and tens there was always one left over. What was the smallest number of marbles Louisa could have had in her bag?

**Math**

Next number in this sequence: -2, 0, 7, 22, 48?

**Math**

What is the absolute value of the average January low temperature

**History**

In order to protect Rome against German invaders, it was? Please don't link me to wikipedia...

**History**

In Rome, If there were a crisis, the consuls could appoint who?

**History**

as a result of the punic wars, rome's navy became? can someone give me something besides a wikipedia because I already read those

**History**

Did the Punic wars help Rome expand or just Roman trade or both? Please help...

**Authors**

In the 5th Wave by Rick Yancey, what happens to Grace? Grace used to be the Silencer Evan Walker's friend.

**Ps 179**

People filled all the seats in the front section of the theater the front section has 6 rows with 40 seats in each row how many people are in the front section of the theater?

**Math**

When a 3-digit number is divided by a 2-digit number, the quotient is between 5 and 6. What are the numbers using only 8 1 4 7 3?

**math**

What's the rule for 1 & 8,2 & 13,3 & 18 and b

**Biology**

Tay-Sachs disease is a hereditary disease that kills 1 in 360,000 individuals in the general population. Individuals homozygous for the defective allele have Tay-Sachs disease and die at an early age.Studies show that heterozygous individuals have a higher rate of survival ...

**Biology**

So would the female offspring develop hemophilia?

**Biology**

A recessive sex-linked allele (h) located on the X chromosome increases blood-clotting time, causing hemophilia. a. With the aid of a Punnet square explain how hemophilic offspring can be born to normal parents? My work: Hemophilic offspring could be born to normal parents ...

**Biology 30**

For ABO blood groups in the humans, the A and B genes are codminant. Both A and B are dominant over O a. Identify the possible blood types in the children of a man with blood type O and a woman with blood type AB. My work: The possible blood types that the children could have ...

**Chemistry**

how many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH

**mathematics**

I have no idea

**Math**

Thanks!

**Math**

Oh btw i think that it is D.

**Math**

Simplify the expression. 1/2(6x-8)-(5x-3) a)3x-4 b)-3x-8 c)-2x-5 d)-2x-1 Thanks!

**Physics**

Where do you go from there? I you plug that in for B you just get 0=0.

**Statistics 2023**

Suppose there is a 11.2% probability that a randomly selected person is aged 20 years or older and is also a jogger. In addition there is a 23.8% chance that a person is 20 years or older, female, given that he or she also jogs. What is the probability a randomly selected ...

**S.S**

its probably d

**physics**

A machine with an efficiency of 100% is said to be efficient. a) If a lever has a distance of 4m from the pivot to where a load of 500N is applied and a distance of 1m from the pivot to where the load is,calculate the efficiency of the lever when height moved by effort i 3m ...

**physics**

A 10kilow walts electric motor is used to raise a 400kg load of bricks to a height of 60meters.The efficiency of the motor 80%.what is the input energy?

**Math Help**

Well the way the problem was on my paper, it doesn't have parenthesis so I wasn't sure if I should add them, sorry. (3)/(x^2)+(x-2)=(-1)/(x+2)+(1)/(x-1)

**Math Help**

Directions: Decide whether the statements are true or false by using partial fraction decomposition. If the statement is false, show the correct way to decompose the partial fraction. 3/x^2+x-2=-1/x+2+1/x-1

**chemistry**

2. A solution of I2 was standardized with ascorbic acid. Using a 0.1000-g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. a) What is the molarity of the iodine solution?

**language arts**

Are any of y'all at connections academy

**English**

I'm creating an intro for an essay with an assigned topic. My teacher marked what I wrote and said 'Too similar to your assigned thesis' and they also wrote 'your thesis must not be altered from what was assigned. What do I do?

**science**

Wood fragments from the floor of a palace in Syria - Syro-Hittite period. Date: 675 ± 50 years BCE?

**trig**

from a top of a hill

**coolkid1234567890**

Purple Blue elementary school is 187 miles from washington dc. According to google maps it should take about 3 hours and 5miutes to get there. What is our speed. Please tell me how you did it and the answer. Thank you

**Math**

A basket contains the following pieces of fruit: 3 apples 2 oranges, 2 bannans, 2 pears, and 5 peaches. Jonas picks a fruit at random and does not replace it. Then beth picks a fruit at random. What is the probability that jonas gets a peach and beth gets an apple?

**Language Arts**

Thx

**Language Arts**

Which is the best way to clarify the sentence "The few arguments against pet ownership scarely need to be mentioned"? A. Most people favor pet ownership, but the author believes that the arguments against it are strong. B. Few people can provide reasons not to own a ...

**educational technology**

lol yeh are all wrong was A D B as the person said at the start like seriously

**Physics**

The driver of a Cadillac is traveling at a constant 60mi/hr. A police car is 20m behind the perpetrator when it too reaches 60 mi/hr and at that moment the officer floors the gas pedal. If the police car roars up to the rear of the Cadillac 2.0s later what was its acceleration...

**Physics Verification**

A poorly tuned Prius can accelerate from rest to a speed of 28 m/s in 20s. a) what is the average acceleration of the car? my answer is 1.4 b) Find its displacement in this time. my answer = 280 Can anyone verify this please?

**Geometry, Help**

Ty STEVE

**Math Statistics**

Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the difference in means ...

**statistics**

Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the difference in means ...

**statistics**

Suppose a large-scale randomized experiment were conducted to compare two weight loss plans. At the end of the experiment, the weight loss for each subject (in pounds) was recorded. The p-value turned out to be .004, and a 99% confidence interval for the difference in means ...

**Math**

Find the solution set of the equation {x^2+y^2=34 {x+y=2

**Math**

Find the solution set of the equation {x^2+y^2=34 {x+y=2

**Math**

Find the solution set of the equation {x^2+y^2=34 {x+y=2

**Math**

Find the solution set of the equation {x^2+y^2=34 {x+y=2

**Maths(help me plz..!**

The sides of a triangle are of lenths x*-y*, x*+y* and 2xy units respectively. Prove that the triangle is a right angled triangle

**Math(angle of depression) i need help please..**

An observer on top of a cliff 25m above sea level views a boat on the sea at an angle of depression of 35. How far is the boat from the foot of the cliff?

**Math**

35/4=x/2, then cross multiplication, 35 by2 and x by 4 then it will be 4x divide by 70 which is = to 17.5

**Maths**

When the angle of elevation of the sin55 a tower cast a shadow 20m long. Find the height of the tower

**French check my answer**

I posted this again because i really need help fast!! I am writing a postcard to my friend saying i went on a trip to the country guadeloupe, this is my letter in english and can you please check if i translated it properly into french, thanks :) Hello Louis. I am visiting the...

**French**

I am writing a postcard to my friend saying i went on a trip to the country guadeloupe, this is my letter in english and can you please check if i translated it properly into french, thanks :) Hello Louis. I am visiting the country Guadeloupe and I love it. I saw the amazing ...

**Science 1 question SPACE**

well i guess there is no such path on images, but thanks Ms.Sue for trying

**Science 1 question SPACE**

I re-posted this question because noone helped and I need help fast! I am doing a project on the planet uranus and I need a map showiong the path to my planet that i have chosen. The picture of the path must include asteroids, comets or other interesting objects. I am having ...

**Science space**

I am doing a project on the planet uranus and I need a map showiong the path to my planet that i have chosen. The picture of the path must include asteroids, comets or other interesting objects. I am having so much trouble looking for such a picture. I have tried looking on ...

**Math**

How do I figure out the problem below? (4-1)x ____ = 3x7 ??

**physics**

vector R= (t^3-9t^2 + 24t + 10)jhat

**Physics**

A 1.0cm wide diffraction grating has 1000slits. It is illuminated by light of wavelength 550nm. What are the angles of the first two diffraction orders?

**it**

Assume you have a computer that contains 1GB of memory. It contains four memory slots. Each slot can contain 128 MB, 256 MB, 512MB, 1 GB, or 2GB memory modules. two of the slots contains a 512MB memory module. What memory chip would you buy to increse the memory on the ...

**physics**

BOOOTY HOLE

**History**

I need answer concrete

**History**

1.What was the new deal's legacy? 2. new measures were taken during the new deal and what agencies were formed?

**math**

2/5

**ENGLISH**

Can someone tell me what is Elite tourism?

**math square root**

Indicate which of the following are true and which are false. for those that are false, change the UPPER-CASE expression to make the statement true. *Every integer is a WHOLE number * the quotient of two non zero numbers is always a RATIONAL number * the counting numbers are ...

**square roots**

Define the square root of a given number with the use of an example.

**math**

a man bought a number of items at a bakery totalling $10.20 ,if the sales tax was $0.51 what is the tax rate?

**maths**

if the number of daily customers served by a restaurant increased from 160 to 208,what was the percent increase?

**maths**

After one year ,a writer had to pay $589 in interest on a $6,200 loan.what is the interest rate?

**Science**

Is this correct? In pea plants, the allele for green pods is G. The allele for yellow pods is g. In the offspring 27 (75 percent) had green pods and 9 (25 percent) had yellow pods. What are the parents genotypes? How do you know? The parents genotypes are GG and gg. Because ...

**history**

difference between iroquois clan mother and iroquois headwoman

**Maths**

A car showroom had 10y cars, 20y motorcycles and 18 vans. In a particular month, 4y cars , 3y motorcycles and 15 vans were sold. a.) Find the total number of wheels on the remaining vehicles in terms of x. b.) If y=21, how many wheels were there? An indoor stadium has 25 460 ...

**physics**

A car travels at 107 km/h on a level road in the positive direction of an x axis. Each tire has a diameter of 74.0 cm. Relative to a woman riding in the car and in unit-vector notation, what are the velocity at the (a) center, (b) top, and (c) bottom of the tire and the ...

**Physics**

2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.

**Geography**

Is Lima, the capital of Peru, east or west of the 80 degrees west line of longitude? Is this correct? East?

**Geography**

Is this correct? What are the three continents with the largest land areas in the world? Asia Africa and north america

**Math**

Jimmy measured four pieces of wood . Their measures are 4.2ft , 9/2 ft, 4.2ft, and 4 2/9 . What is the length of the shortest piece ?

**Stats**

Can someone please explain how to find the frequency from: Lower limit:230,240,250 upper limit:239,249,259 Mid Value:234.5,244.5,254.5

**english**

which one of the following sentences contains a collective noun? A. the quality of mercy is not strained. B. wo among you is a butcher, a baker, or a candlestick maker? C. Listen, my children, and you shall hear. D. the legislature met in secret session. is it (B)?

**Statistics**

A professor receives, on average, 8 emails from students on the day before an online quiz. If the distribution of the calls is Poisson, what is the chance that he received at least 6 and at most 10 emails on such a day?

**Ap Phyics**

Figure shows an overhead view of a 0.024 kg lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force F1 has a magnitude of 6 N and is at ¥è1 = 25¢ª. Force F2 has a magnitude of 10 N and is at ¥è2...

**reading**

I know that it is polk-a-dotted but in what colors?

**reading**

In the book, "The face on the milk carton", what color is Janie's shirt?

**health class**

how do you convince someone to stop smoking. Also,how do you relieve stress without smoking or eating? Please help.

**Cooking Class**

Can you help me find a link on how to make zeppoles (ex; step 1 then step 2) Please.

**spanish**

Hello Can someone in here help me with my spanish homework? It's only 100 words

**physics**

The drawing shows a skateboarder moving at 5.34 m/s along a horizontal section of a track that is slanted upward by 47.7 ° above the horizontal at its end, which is 0.795 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...