# Posts by robert

Total # Posts: 991

**Chemistry**

A fixed amount of oxygen gas is held in a .500 L tank at a pressure of 4.09 atm. The tank is connected to an empty 1.50 L tank by a tube with a valve. After this valve has been opened and the oxygen is allowed to flow freely between the two tanks at a constant temperature, ...

**ap**

it doesn't matter i just needed an answer to get an idea of what i'm going to say

**ap**

What is the most accurate description of human nature?

**History**

How does Galileo defend himself against these charges of heresy by the Inquisition?

** Statistics**

Q1:(a) Make a relative frequency table of the data. Enter your answers to three decimal places. Cell Phone Owned Relative Frequency Android smartphone iPhone smartphone Blackberry smartphone Cell phone not smartphone No cell phone Total (b) Round your answers to the following ...

**pre calc**

The number N of bacteria in a culture at time t (in hours) grows exponentially according to the function N(t) = 1000e^0.01t When will the number of bacteria reach 1700? I though you would do 1700=1,000^e0.01t and solve for t but i keep getting the wrong answer can someone ...

**pre calc**

The population of a colony of mosquitoes grows exponentially according to the function P(t) = P0ekt 1. If there are 1,000 mosquitoes initially and there are 1800 after 1 day, what is the size of the colony after 3 days? 2. How long will it take the colony to reach 10,000 ...

**computer programming**

Design the logic for a program that allows a user to enter any amount of numbers up to 10 or until a sentinal value of -1 is entered. Then the program displays the count of the numbers entered and numeric average of the numbers (not including the -1 of course). After display ...

**DISTANCE TIME AND SPEED**

if the speed of a car is increased from 90km/h to 120km/h, the time is reduced by one hour to reach the destination. Calculate the distance between the two towns.

**Physics**

Huck Finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the shore). The raft is traveling down the Mississippi River at a speed of 2.20 m/s relative to the river bank. What is Huck’s velocity (speed and...

**Physics**

Also find the final velocity in y (v_fy) of the shot just before it hits the ground.

**Physics**

A projectile is shot from the edge of a cliff 145m above ground level with an initial speed of 65.0 m/s at an angle of 37.0° with the horizontal. How far did the shot go horizontally?

**Physics**

Your gun is perfectly level with a monkey at a distance of 55 m. Your bullet is shot perfectly horizontal at a speed of v_0=38 m?s at the exact moment the monkey lets go of the branch. How far does the monkey fall before the bullet hits it?

**Physics**

During your trip in question 10, you encounter some construction. In 25 seconds, you have to slow from 70 mph to 55 mph. What is your acceleration in mph/s?

**Physics**

After today’s test, you are going to meet some friends at Disney World. The total distance to Disney World is 68 miles. If you make it there in 72 minutes, what is your average velocity in miles per hour?

**Physics**

Assume you have a canon aimed straight up. The cannonball is shot at a velocity of v_0=69 m/s. How high does the cannonball go? How much time does it take the cannonball to reach that height?

**College Algebra**

x+2y=0 x+3y+z=1 -4x-y-z=23

**math**

i need ratios of 5/6

**Math**

16/25

**Math**

Roberto wants to reduce a drawing that's is 12 inches long by 9 inches wide.if his new drawing is 8 inches long. How wide will it be

**Math**

An 8.5 centimeter green bean pod contains peas that average 0.45 centimeter in diameter. How many peas are in the pod

**Social studies**

It is indeed B A B A

**Math**

He is supposed to need 2 liters, not 22! Sorry for the typo

**Math**

A chemist needs 22 liters of a 14% acid solution. He has a 10% solution and a 20% solution available to form the mixture. How much of each should be used to form the 14% solution? I'm having a really hard time forming an equation for this. I've ...

**Chemistry**

An element has three stable isotopes. One has a mass number of 63 and an abundance of 50%. The second has a mass number of 65 and an abundance of 30%. The third has a mass number of 67 and an abundance of 20%. Calculate the relative atomic mass of this element. I am so ...

**Biology**

why is protein folding important to enzyme activity?

**Social Studies (Check Answers)**

@LOL How would it be A and D if Mrs. Sue said 1 was C?

**math**

32 cans for 7 dollars how much per can

**geography**

Trees

**Social studies answer check please**

@Blupo is right.

**Linear Algebra**

Thank you very much Reiny I was stumped on that but thanks to your assistance I was able to solve the problem. Thank you very much!

**Linear Algebra**

The Vector v has a length of 15 and points at an angle of 30 degrees. The Vector u has a length of 17 and points at an angle of 55 degrees. What is u*v? I know to get my answer I need to use this format |u|*|v|*cos(theta) however I am stuck at setting up my vectors I only know...

**algebra 1**

whoops typo on your last problem I meant divide by 4 not 4x my apologies.

**algebra 1**

For your first question think about it like this -7+9=2 and -9+7=-2. -2 and 2 are not equal. For 4x-3=19 you need to add 3 to both sides of your equation and then divide by four on both sides to get your answer for x then plug in x to your equation and see if it equals 19 in ...

**Social Studies**

@I_Dont_Have_A_Name Thanks.

**Math**

1. B 2. D 3. C 4. B 5. C

**Math**

Yes its B

**Math**

Suppose that A and B are independent events such thatP(A)=.50 andP(B)=.30 . Find and P(A U B) and P(A upside down U B) .

**physic**

Does anyone actually answer questions on here?

**World History**

chicken noddles soup is very awesome to a lot of people pasta

**Mayh**

Bert gave me 1/2 of the candy bar then I gave 1/2 of what I have to my sister What fraction of the whole candy bar did my little sister get and what percent did she get

**Communication for Business**

1. Introduction A. Attention getter B. Area you are interested in career filed C Preview of points covered in body 11. Body A. Career field 1. Name of person interviewed

**Communication for Business**

Please could you help me with a good attention getter for a presentation on how interviews were done

**Chemistry**

If the heat of combustion for a specific compound is -1250.0 kJ/mol and its molar mass is 35.39 g/mol, how many grams of this compound must you burn to release 352.40 kJ of heat?

**Algebra**

Okay so first you find the 363 square root of 363. Then you find the square root of 27. Then you apologize to your connections academy teacher for cheating online. And there you have it! All three steps!

**Math**

Gina has 4 red ribbons, 6 times as many blue ribbons as green ribbons, and 1/4 as many green ribbons as red ribbons. How many ribbons does she have in all?

**Physics**

Two metallic spheres of mass .001 kg hang from a point by .3 m strings. Each is given the same amount and sign of charge. After equilibrium is reached, they each make an angle of 20 degrees relative to the vertical. Determine the amount of charge in each sphere.

**math**

how do you write twenty million three hundred thousand

**physics**

What is the mass which causes a spring of k = 100 N/m to stretch by 10 cm?

**Math**

What point on the unit circle corresponds to -5pi/4? A. (-Root2/2, Root2/2) B.(-Root3/2, 1/3 C.(-1/2, Root3/2) D.(0,1) D?

**Geography**

This dick

**math**

a boy runs 18.4 miles in 4.5 hours, how many miles can he run in 1 hour?

**Science**

HES RIGHT!! I MADE A 100%

**Finance**

Your program has a research and development project scheduled to start in January 2014 which is expected to take 40 months to complete. The project is expected to cost a total of $150 million (then-year dollars), with cost expected to be incurred as follows: FY Cost to be ...

**Math**

How'd you get 1,150,000? The answer would be 9583 I think?

**Math**

The Japanese yen corresponds to the american dollar. If the exchange rate is 150 Yen for 1 Dollar, then A japanese car sold in america for $10,000 will bring in 1,500,000 yen. If the exchange rate changes to 120 yen for each dollar, then what price in dollars would the car ...

**College algebra**

Matt and Jena, working together, can clean the house in 9 hours. Working alone, Jena takes three times as long as Matt. How long does it take Matt to clean the house.

**Grammar**

When ending a letter to a high gov't official with the phrase 'Respectfully Submitted', are both words capitalized, or just the first?

**AP Physics**

A 5.86 kg block initially at rest is pulled to the right along a horizontal surface by a constant, horizontal force of 14.4 N. The coefficient of kinetic friction is 0.14. The acceleration of gravity is 9.8 m/s 2 . Find the speed of the block after it has moved 4.98 m. Answer ...

**Math**

jeff rode bike 5 times as many miles as Vin. together they rode 18 miles. how many miles did each boy ride

**Cheistry**

single titration was performed which required 11.82 ml of .1 M Na2S2O3 the density of the original undiluted bleach unknown was 1.04 g/ml calculate the number of moles of ClO- in the sample titrated ClO- + 2I- + 2H+ === I2 + Cl- + H20 I2 + 2S2O2/3- === 2I- + S2O2/6-

**Life Skills**

How Does Empathy Positively Affect Education?

**Chemistry**

Are my answers correct? Calculate the molarity: a) 0.500 mol of NaOH in 2.45 L of solution. b) 24.1 g of NaCl in 853 mL of solution. a: 0.2 M b: 0.49 M

**Physical Science**

If a skydiver has a forward velocity of 40 m/s, what is the forward velocity after one second? What is the downward velocity after one second?

**math**

I am between 20 and 30. When you put me into 5 equal groups, there is an odd number in each group and one is left over. what number am I?

**Chem**

Depending upon the tip of a dropper pipet, there are approximately 20 drops per milliliter of water. The experimental procedure indicates the addition of 5-10 drops of each solution to the test tubes. Calculate the volume range in milliliters for the solution. Can you please ...

**math**

describe a real world relationship between the area of a rectangle and its width, as the width varies and the length stays the same. Sketch a graph to show this relationship.

**P.E**

LISTEN I AM TRYING TO HELP YOU is lying. Its all correct.

**chemistry**

find the# of molecules in 5.3 moles of h20

**Technolgy**

Thanks.

**Math**

If I work 5 days a week making $8.38 an hour, how would I figure out how much I make a month, getting paid bi weekly?

**Tech**

Haleyy is right.

**Commonwealth connections academy**

Thanks Kat, Kat was right.

**Physics**

While John is traveling along a straight interstate highway, he notices that the mile marker reads 280. John travels until he reaches the 156-mile marker and then retraces his path to the 175-mile marker. What is John's resultant displacement from the 280-mile marker?

**Science**

B. An element with eight valence electrons is chemically unstable. It would be unstable only with one to seven valence electrons, not eight.

**Matg**

Juanita told her dad that she won 80% of the card games she played yesterday. If she won 4 games, how many games did she play?

**Chemistry**

Dividing 0.32g of sulfur by its density of 2.07g/cm^3 results in an answer with three significant figures? Am I right?

**Geometry**

Question: If a ray divides an angle into two supplementary angles, then the original angle is a straight angle. True?

**Geometry**

Line TV bisects <STU, m <STV = (1/4x +8), and m<UTV= (x+2( Find m<STU I get 25 but the choices are 40 10 20 30

**life science**

the hypothesis is the test that expired air contains carbon dioxide

**chemistry**

A 30.0 g sample of water at 10.0°C is mixed with 50.0 g of water at 57.0°C in a calorimeter. Calculate the final temperature of the mixture

**Calculus**

I'm not sure what I am doing with my life.

**navarro college biology**

During the sequencing of dna into a protein, what is the first step?

**English**

Please could you help me that I don't have run on sentences or if I need commas.After reading "Man's Nature is Good" Mencius argues that man is born good but, that life itself makes a man evil. He states "Human nature is inherently good, just like water ...

**Algebra**

Solve. -9(4-k)/12 = 9(k+1)/8

**Math**

The vertical backboard located 4ft from the baseline supports the rim of the basketball net. The backboard measures 6ft wide by 4ft high. The shooter's square is a white box above the rim of the basket. It must measure 1 1/2 ft high and 2ft wide. What is the area of the ...

**life orientation project**

research and briefy discuss the following processes that the community must engage whenever there is an issue before and during a protest :how to engage in a protest, protest restrictions,permit to hold a protest, activities during a protest,as well as the powers of the police...

**math**

If A + B + c = 180 then show that sinA + sinB + sinC=4cosA/2. cosB/2 . cosC/2

**General Chemistry 132**

What is your profession Dr Bob

**General Chemistry 132**

When solid NH4NO3 is dissolved in water at 25celcius, the temp of the solution decreases. What is true about the signs of enthalpy and entropy for this process? I understand entropy is positive, however, i do no understand why enthalpy is also positive. Can someone please ...

**precalculus**

hyperbola with vertices at (0,+/-2), and asymptotes y=+- 1/2x

**Science**

How does the sun's gravitational attraction to the earth compare to that of the moon?

**math:Fundamental Counting Principlal**

solve the problem by applying the fundamental counting principal with two groups of items. Shaun is joining a music club. as part of ther 4-cd introductory package she can choose from 12 rock, 10 alternative, 7 country, and 5 classical. if Shaun choose one selection from each ...

**math**

A baker can make a cupcake for $2.30. She would like a profit of 50 cents each. What is the percent markup on the cupcake, to the nearest tenth of a percent?

**math**

So do i just subtract 180-50.7?

**math**

2 line segments intersect to form an angle that has a measure pf 50.7 degrees. What is the measure in degrees of an angle that is supplementary to this angle. I don't understand what this question is asking me. Can someone explain it to me?

**Chemistry**

Use half reaction to balance: CuS + NO3^- = Cu(NO3)2 + NO2 + SO2 S^2- = SO2 S Oxidized Cu^2+ + NO3^- = NO2 + Cu(NO3)2 N Red After balancing the atoms & balancing the charges, I cannot get all the correct coefficients

**Physics**

You're an investigator for the National Transportation Safety Board, examining a subway accident in which a train going at 80km/h collided with a slower train traveling in the same direction at 20km/h . Your job is to determine the relative speed of the collision, to help ...

**math**

(x+3.57)+x+(x+2.97)=15 3.57+2.97+3x=15 6.54+3x=15 3x=15-6.54 3x=8.46 x=8.46/3 x=2.82 2.82+3.57+2.82+2.97+2.82=15 6.39+2.82+5.79=15

**1**

Because Hitler and his gang of goons took power.