Wednesday
September 28, 2016

Posts by robert

Total # Posts: 951

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 ...
September 24, 2016

Biology
why is protein folding important to enzyme activity?
September 14, 2016

Science
@Alexandria Wrong
September 13, 2016

math
32 cans for 7 dollars how much per can
September 8, 2016

Social studies answer check please
@Blupo is right.
September 7, 2016

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!
September 6, 2016

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...
September 6, 2016

algebra 1
whoops typo on your last problem I meant divide by 4 not 4x my apologies.
September 6, 2016

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 ...
September 6, 2016

Social Studies
@I_Dont_Have_A_Name Thanks.
September 1, 2016

Math
1. B 2. D 3. C 4. B 5. C
August 30, 2016

Math
Yes its B
August 29, 2016

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) .
July 31, 2016

physic
Does anyone actually answer questions on here?
May 15, 2016

World History
chicken noddles soup is very awesome to a lot of people pasta
May 14, 2016

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
May 10, 2016

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
April 16, 2016

Communication for Business
Please could you help me with a good attention getter for a presentation on how interviews were done
April 16, 2016

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?
April 11, 2016

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!
April 8, 2016

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?
April 5, 2016

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.
March 13, 2016

math
how do you write twenty million three hundred thousand
February 15, 2016

physics
What is the mass which causes a spring of k = 100 N/m to stretch by 10 cm?
February 15, 2016

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?
February 12, 2016

math
a boy runs 18.4 miles in 4.5 hours, how many miles can he run in 1 hour?
January 4, 2016

Science
HES RIGHT!! I MADE A 100%
January 4, 2016

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 ...
December 23, 2015

Math
How'd you get 1,150,000? The answer would be 9583 I think?
December 11, 2015

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 ...
December 11, 2015

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.
December 2, 2015

Grammer
When ending a letter to a high gov't official with the phrase 'Respectfully Submitted', are both words capitalized, or just the first?
November 28, 2015

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 ...
November 11, 2015

Math
jeff rode bike 5 times as many miles as Vin. together they rode 18 miles. how many miles did each boy ride
November 9, 2015

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-
October 30, 2015

Life Skills
How Does Empathy Positively Affect Education?
October 28, 2015

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
October 22, 2015

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?
October 12, 2015

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?
October 11, 2015

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 ...
October 10, 2015

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.
October 6, 2015

chemistry
find the# of molecules in 5.3 moles of h20
September 30, 2015

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?
September 16, 2015

Tech
Haleyy is right.
September 15, 2015

Commonwealth connections academy
Thanks Kat, Kat was right.
September 8, 2015

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?
September 7, 2015

Science
B. An element with eight valence electrons is chemically unstable. It would be unstable only with one to seven valence electrons, not eight.
September 7, 2015

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?
September 6, 2015

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?
September 2, 2015

Geometry
Question: If a ray divides an angle into two supplementary angles, then the original angle is a straight angle. True?
August 20, 2015

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
August 19, 2015

life science
the hypothesis is the test that expired air contains carbon dioxide
August 3, 2015

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
July 20, 2015

Calculus
I'm not sure what I am doing with my life.
July 8, 2015

navarro college biology
During the sequencing of dna into a protein, what is the first step?
June 13, 2015

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 ...
June 3, 2015

Algebra
Solve. -9(4-k)/12 = 9(k+1)/8
June 2, 2015

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 ...
May 15, 2015

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...
May 11, 2015

math
If A + B + c = 180 then show that sinA + sinB + sinC=4cosA/2. cosB/2 . cosC/2
May 8, 2015

General Chemistry 132
What is your profession Dr Bob
May 6, 2015

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 ...
May 6, 2015

precalculus
hyperbola with vertices at (0,+/-2), and asymptotes y=+- 1/2x
May 6, 2015

Science
How does the sun's gravitational attraction to the earth compare to that of the moon?
May 3, 2015

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 ...
April 30, 2015

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?
April 28, 2015

math
So do i just subtract 180-50.7?
April 9, 2015

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 dont understand what this question is asking me. Can someone explain it to me?
April 9, 2015

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
March 28, 2015

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 ...
March 25, 2015

1
Because Hitler and his gang of goons took power.
March 18, 2015

Math 7th grade
Geraldo bought some computer software on layaway. He paid $12 down and must make a payment of $5 each week for 4 weeks. How much will Geraldo pay in all?
March 16, 2015

Algebra 2
Multiplying or dividing rational expressions 6x^2 + 13x - 5 divide by 6x^2 -23x + 7 Need to show my work.
February 22, 2015

multivariable calculus
show that a=!0 , the equation p=2asin0cos0 describes the sphere centered(a,0,0) at radius|a|
February 15, 2015

Physics
The mans mass would be the same as on earth so its just 560/9.8=57.14kg Second part is F=[(Gconstant)(m one)(m two)]/(radius)^2 G constant is 6.67E-11
February 12, 2015

Physics
static =velocity squared over (radius times gravity). solve for velocity and you get velocity to equal square root (radius*gravity*static)=square root of .15*.30*9.8= .664 m/s
February 10, 2015

math
its 58,000
January 29, 2015

math
i have tryed this like ten times but cant get the answer can u help. 58,00 times 7.40% after u get the answer between the two multiply by 3
January 29, 2015

Language Arts
The correct answer is decided.
January 27, 2015

Math
38 multiplied 4 equals 152 does not represent an inequality representing t - read the question again
January 26, 2015

geometry
a pentagon with a perimeter of 45 feet
January 22, 2015

English
To __________ shall I address this letter? A. whom B. who
January 20, 2015

I guess this is physics related?
Yeah I've done a project like this and we had to measure the time with a very precise instrument.
December 29, 2014

I guess this is physics related?
What is the biggest source of error in measuring the acceleration of a ball down a ramp? knowing the length of the ramp accurately measuring the time knowing the height of the ramp knowing the mass of the ball****
December 29, 2014

science
A + F = yes perhaps also "B - The orientation of the chamber" since this could change between one end of the chamber and the other? ? thoughts? orientation = up/down?
December 13, 2014

science
Yes, I think A + F could be confounding variables probably not B + D + E B does not change across the chamber D is irrelevant E is also irrelevant probably not C, this does not change across the chamber thoughts?
December 13, 2014

science
What is a confounding variable? "A confounding variable is a variable, other than the independent variable that you're interested in, that may affect the dependent variable. This can lead to erroneous conclusions about the relationship between the independent and ...
December 13, 2014

science
An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...
December 13, 2014

Math
The function f given by f(x) = x^3 + 12x – 24 is? Increasing for all x's? Cause that's what I think..
December 9, 2014

Chemistry
Calculate the solubility (in g/L) of calcium fluoride in water at 25°C if the Ksp for is 1.5 × 10-10 .
December 2, 2014

American National Government
Since the 1930s, when the federal government became more involved in domestic policy functions, federalism has come to be understood as a relationship in which the states are moresubordinate to the supreme power and authority of the national government. **So would the answer ...
December 1, 2014

American National Government
Despite the greater federal authority in the federal relationship, federalism is still important for all the following reasons except that: A)it provides the best means of developing a vast country because it allows for experimentation. B)it may stimulate the interest of the ...
December 1, 2014

POL 201
Despite the greater federal authority in the federal relationship, federalism is still important for all the following reasons except that: A)it provides the best means of developing a vast country because it allows for experimentation. B)it may stimulate the interest of the ...
December 1, 2014

POL 201
Actually the correct answer is "C" it impedes the authority of the government.
November 23, 2014

POL 201
Thank you Ms. Sue
November 23, 2014

POL 201
After reading this link, would it be All basic protections were contained in the Constitution?
November 23, 2014

POL 201
The federalists argued that a Bill of Rights was not necessary because? A. All basic protections were contained in the Constitution. B. the anti-Federalists were being irrational. C. it impedes the authority of the government. D. it would take too long to ratify.
November 23, 2014

english
3. In “The Pigman & Me,” the author creates a mood of suspense by focusing most of the action around a fight between two boys at school. a tree cut almost to its heart. Nonno Frankie’s advice to Paul. concerns about how a girl will react.
November 17, 2014

language arts
Which of these best states Nonno Frankie’s main idea of how to win a fight?
November 17, 2014

physics
what is the t shirts vertical componet of its velocity at launch? if it launches straight at 45° above the horizontal plane at 141 /s?
November 13, 2014

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