Monday
October 24, 2016

# Posts by carlos

Total # Posts: 293

Chemistry
Calculate the volume of 0.05 M NaOH which must be added to 100 cm3 of 0.05 M methanoic acid to obtain a buffer of pH 4.23. (Ka for methanoic acid = 1.77 x 10-4)
October 11, 2016

chemistry
Air on Earth is roughly 80% nitrogen and 20% oxygen by volume. At sea level, where atmospheric pressure is 101,325 Pa (or 1 atm), the concentration of oxygen in human blood is 2.6 x 10-4 mol/L at 25 °C.
October 2, 2016

chemistry
For a skydiver jumping out of a plane at an altitude of 1 km, what would be the concentration of oxygen in his (or her) blood knowing that air pressure at 1 km drops to 89,874 Pa? Assume ideal behavior of gases, normal breathing, 25 °C and constant air composition. Hint: ...
October 2, 2016

chemistry
List the following strong electrolytes solutions in order of increasing boiling point. a. 0.1 M CaCl2 b. 0.1 M AlCl3 c. 0.1 M CaS
October 1, 2016

math
One car is traveling at a speed of 242km/h and another one at a speed of 217km/h.In 12 hours,how much farther will the car that's traveling at 242km/h go than the car that's traveling at 217km/h?
September 22, 2016

Math
Ritz plumbing company charges a service fee of \$75 and charges \$50 per hour to fix your plumbing.
September 18, 2016

Math
How do you do this problem its a literal equation problem. S = 2πr2 + 2πrh
September 18, 2016

Math
can you help me ms.sue i don't know how to do the problem
September 18, 2016

Math
S = 2πr2 + 2πrh
September 18, 2016

pre-cal
The angle of elevation from a car to the top of an apartment building is 48 degrees. If the angle from another car that is 22 feet directly in front of the first car is 64 degrees. How tall is the building?
August 21, 2016

Algebra
I have a swimming pool in my backyard and to avoid overcrowding I want to find the maximum area of it so I can figure out how many people I can bring to my pool party that can actually fit in the pool. What is the maximum area of my swimming pool if I have 3100 gallons of ...
April 30, 2016

Math - Please check!
1. Find the circumference of a circle with a diameter of 11 cm to the nearest hundredth. Measurement formula C = pi x diameter a. 34.54 cm *** b. 17.27 cm c. 5.5 cm d. 33 cm 2. Which of the following is an irrational number? a. square root 144 b. 0.25 c. square root 17 *** d. ...
April 14, 2016

Math - Help!
Which number is an irrational number? a. 0.12 b. 0.1257486… *** c. 0.12121212… d. 0.111111…
April 14, 2016

Health
What does the U.S government use to estimate a persons body weight status ?
March 19, 2016

Hey
Empty calories are defined as
March 19, 2016

metods
solve for newton raphson f(x)=5sinx^2-8cosx^5
March 8, 2016

Chemisrty
Assuming equal concentrations, rank these solutions by pH: hclo4 caoh2 NH3 koh hbro
March 5, 2016

Math Fractions
Warren read 1/6 of the pages of a book last Monday. Tuesday he read 2/5 of the remainder of the pages. Wednesday he read 1/3 of the remaining pages. He has 60 more pages left to read. How many pages does the book have?
February 21, 2016

Math
7/10 of the people in the clubhouse are adults. If there are 48 more adults than children, how many are there in the clubhouse?
February 19, 2016

Math
X^2-34x+100=0 solve
November 30, 2015

Math
A man who is 6.2 ft tall casts a shadow that is 13.6 ft long. Find the height of a petrified stump that casts a 16.9 ft shadow.
November 21, 2015

Physics
A rock is thrown horizontally off of a cliff. It starts with a velocity of 4.2 m/s and the cliff is 68.2 m high. How long does the rock fall? I got 3.7 seconds but I do not know if it is right. (Help on these two) How far out from the bottom of the cliff does the rock fall? ...
October 26, 2015

Math
The distance between two numbers on the number line is 15. If one of the numbers is 5, what are the two possibilities for the other number?
September 6, 2015

fisics
a storage tank containing H2O is connected to an output of 6 ft in diameter. a circular plug is used to seal the tank. dtermine the address and location of the force on the cap scale h2o
September 1, 2015

8th grade math
A rubber ball loses 30% of its height each A rubber ball loses 30% of its height with each bounce How high is the first bounce if the ball is dropped from a height of 500 cm?
May 31, 2015

Algebra
Write y = 3x - 1 in function notation and evaluate the function at x = 0, x = 3, and x = z. Please label your values and use the correct notation when posting.
May 12, 2015

algerbra
Find the approximate length of the leg of a right triangle with one leg length 8 and hypotenuse length 19
May 7, 2015

statistics
Airline overbooking is a common practice. Many people make reservations on several flights due to uncertain plans and then cancel at the last minute or simply fail to show up. Jet Green airlines’ planes hold 100 passengers. Past records indicate that 20% of the people ...
April 23, 2015

Math
Thomas started at his house and walked due east50 yards then he walked due west 50 yards and east 20 yards . Which best describes where Thomas was at the end of his walk
April 20, 2015

math
Length = 4 + x Width = x Height = x 2 + 1 What is the base area?
April 12, 2015

math
Dylan uses the expressions (x2 – 2x + 8) and (2x2 + 5x – 7) to represent the length and width of his bedroom. Which expression represents the area (lw) of Dylan’s room?
April 12, 2015

algebra1
-7x+y=19 -2x+3y=19
February 24, 2015

algebra1
-3x+7y=-16 -9x+5y=16
February 24, 2015

Algebra 1
-4x + 9y=9 x-3=-6
February 24, 2015

Algebra 1
5x + y= 9 10x-7y=18
February 24, 2015

Algebra 1
7x + 2y = 24 8x + 2y = 30
February 24, 2015

math
Jane gets 1/2 of a gold star each time she helps her teacher clean up the classroom after art class.How many times would Jane need to help her teacher to earn 3 while gold stars?
February 12, 2015

Algebra
A rectangular swimming pool is twice as long as it is wide. A small concrete walkway surrounds the pool. The walkway is a constant 2 feet wide and has an area of 196 square feet. Find the dimensions of the pool.
February 8, 2015

algebra 1
PLEASE HELP! NO ONE ANSWERED THE QUESTION three times an odd integer is eleven less than four times the next greater even integer. What is the odd integer?
January 26, 2015

algebra
three times an odd integer is eleven less than four times the next greater even integer. What is the odd integer?
January 25, 2015

algebra
Find all sets of three consecutive multiples of 11 for which the sum of two lesser numbers is greater than 100 and the sum of the two greater numbers is less than 200
January 6, 2015

math
the sum of an even integer and twice the next greater even integer is the same as the difference between five times the greater even integer is 14. Find the integers. There are two solutions
January 6, 2015

physics
A golfer takes two putts to get his ball into the hole once he is on the green. The ﬁrst putt displaces the ball 3.4 m east, and the second 6.55 m south. What displacement would have been needed to get the ball into the hole on the first putt. answer in units of m
January 1, 2015

Chemistry
The reaction: H2C2O4 + CuO + Heat = ? This reaction was produced in organic elemental analysis to identify C and H. So I think CO2 is formed to react with Ca(OH)2 to giving CaCO3. Additionally was formed H2O, so I though H2 or H2O was produced. Is correct : = C2CuO4 + CO2 + H2 ?
November 26, 2014

Math
Log2base10=0.301 and log3base10= 0.477. Evaluate log45base10
November 25, 2014

physics
A 2.0kg book is lying on a 0.74m high table. You pick it up and place it on a bookshelf 2.0m above the floor
October 31, 2014

Physics
This is very confusing to me, I tried a couple of the problems and got them wrong. I would really appreciate the help, and an explanation to study for the exam. Thank you in advance. You are the technical consultant for an action-adventure film in which a stunt calls for the ...
October 31, 2014

Physics
Thank you so much.
October 21, 2014

Physics
I am really confused on the steps to solve this problem. This is my first time taking physics. The much needed help, would be strongly appreciated. a) Calculate the centripetal force exerted on a vehicle of mass m = 1630 kg that is moving at a speed of 13.9 m/s around a curve ...
October 21, 2014

Spanish
Ustedes necesitan hablar con el profesor de economía.
October 4, 2014

chemistry
How do you calculate the mass percent composition of nitrogen in NO2?
September 27, 2014

English
I think C or D
May 13, 2014

English
thank you. I also need help with this last question. What is historical context? A.the map or plan a writer drafts while planning a story B.the author’s choice about where to publish a text C.all the actions that take place during a story D.the people and events that ...
May 13, 2014

English
Read the definition. Need Help the result produced from an event Which term is defined? A.cause B.exposition C.effect D.elaboration
May 13, 2014

math
67=(3-6x)/4.13 (note:its a fraction) (please help)
May 11, 2014

math
simplify: a)9x+9-1 b)10n-4n c)-8v+6(10+6v) d)7(9k+8)+3(k-10) a)x=? b)n=? c)v=? d)k=? (please help)
May 11, 2014

math
suppose the ratio of your income last year to your income this year is 3 to 2. explain what this means. give an example of the dollars earned last year and this year that fits the 3 to 2 ratio.
May 6, 2014

math
find the best buy on spaghetti sauce. you have a coupon for \$0.75 off brand x and a coupon for \$0.25 off brand y. 28 ounces of brand x for \$3.89 18 ounces of brand y for \$1.89 13 ounces of brand z for \$1.29
May 6, 2014

math
a boat travels 75 miles in 4 hours. at that rate, how long will it take to travel 120 miles?
May 6, 2014

math
Pedro types 240 words in 5 minutes. How many words can he type in 12 minutes? please help.
May 6, 2014

English
Which of the following describes literary analysis? Need help Please. A.writing that is vague and uncertain B.a central message about life C.determining the meaning behind events and characters’ actions D.written directions about how the actors sound and behave
April 27, 2014

math
terry's boat traveled 65 miles in 3 hours. at that rate, how long will it take her to travel 100 miles?
April 24, 2014

math
tala is correct
April 23, 2014

math
what?
April 23, 2014

math
just us PEMDAS P=parenthasis E=exponents M=multiplication D=divition A=adding S=subtracting
April 23, 2014

Physics
The students made it to the bottom with out a problem but added 400 kg for a total of 455 kg and slides for 12.2 s across the surface of a frozen lake. If the coefficient of kinetic friction between the kid and the ice is 0.071, what is the change in the students momentum as ...
February 25, 2014

Math
A particle is moving along the curve y = 4x^2 + 1 in such a way that the y coordinate is increasing at a rate of ½ units per second. At what rate is the x coordinate changing at the instant x = 2?
February 23, 2014

High school
ÄHvap of acetone and cyclopropanol
February 17, 2014

Physics
A girl sitting on a merry-go-round moves counterclockwise through an arc length of 3.75 m. If the girl’s angular displacement is 2.12 rad, how far is she from the center of the merry-go-round? Answer in units of m
February 4, 2014

Physics
A girl sitting on a merry-go-round moves counterclockwise through an arc length of 3.75 m. If the girl’s angular displacement is 2.12 rad, how far is she from the center of the merry-go-round? Answer in units of m
February 4, 2014

math
from a height of 40 m above sea level, two ships are traveling due west. the angles of depression are 45 degrees and 60 degrees. how far apart are the ships?
January 29, 2014

math
Mary has 12 marbles.3/12 of the marbles are yellow and 2/12 of the marbles are blue. The rest of the marbles are green. How many marbles are green? Explain your answer.
January 22, 2014

Chenistry
A 0.8870g sample of a mixture of nacl and kcl is dissolved in water and the solution is then treated with an excess of agn03 to yield 1.913g of agcl. Calculate the percentage by mass of nacl in the mixture 1.913g/ 143 = 0.0133 M agcl x/58 + Y/74 (0.887g-x) = 0.0133 Who helps ...
January 19, 2014

Algebra
y is 5 less than the product of 8 and x.
January 7, 2014

Health part 2
Diastole is the ________ phase of the cardiac cycle. A. Contraction B. Relaxation C. Monitoring D. Termination
November 5, 2013

Health part 2
The brain is divided into the _______. A. Cerebrum B. Cerebellum C. Brain stem D. All of the above
November 5, 2013

Health part 2
Arteries carry blood ________ the heart. A. Away from B. Towards C. Closer to D. All of the above
November 5, 2013

Health part 2
The three basic parts of a neuron include ________. A. Soma, dendrites, axon B. Dendrites, cell body, neurotransmitters C. Axon, dendrites, neurotransmitters D. None of the above
November 5, 2013

Health part 2
no its not D
November 5, 2013

Health part 2
The heart circulates the blood to all the ________ in the body. A. Muscles B. Capillaries C. Tissues D. Organs
November 5, 2013

Health part 2
Veins carry blood ________ the heart. A. Away from B. Towards C. Neither of the above D. All of the above
November 5, 2013

Pysics
Marbles rolling down the ramp and horizontally off your desk consistently land 46.0 cm from the base of your desk. Your desk is 78.5 cm high. If you pull your desk over to the window of your second story room and "launch" marbles to the ground (6.04 meters below the...
October 17, 2013

Physics
if the water in the river moves downstream at 4mi/hr heading the boat straight across the river, what direction will the boat move relative to the shore? i don't want the answer... i want someone to explain. i wanna learn
October 16, 2013

Physics
thanks!
September 30, 2013

Physics
While exploring the canopy of the rainforest in equatorial South America, Anastasia falls from a branch 43.0 meters high. Exactly 1.6 seconds later Joe falls from the same branch. How high above the ground is Joe when Anastasia splats into the mud below?
September 30, 2013

arithmetic
If I WALK FROM MARKER 8.8 MILE TO MARKER 11.8 MILE HOW FAR IS THAT?
September 15, 2013

Pysics
thanks
September 14, 2013

Pysics
A caiman swims 185 meters at a speed of 6 m/s. It then enters a stream and slows to 2 m/s for 310 meters. What is the average speed of this cousin of the crocodile?
September 14, 2013

English
-A job report.
August 14, 2013

English
I need help writing 2 paragraphs for one of the below. -a job report -your most unforgettable character -an analysis of the causes for some phenomenon or event -the consequences of a new discovery or event
August 14, 2013

Statistics
thanks joan
August 10, 2013

English
a job report and the consequences of a new discovery or event.
August 8, 2013

English
I need help with this please. Write two compositions. To help you get started, you can choose to write about any two of the following four topics: -a job report -your most unforgettable character -an analysis of the causes for some phenomenon or event -the consequences of a ...
August 8, 2013

English
I need help writing 1 expository paragraph and 1 persuasive paragraph.
August 6, 2013

English
How to make a peanut butter sandwich.
July 31, 2013

English
Need help please. For the following exercise, choose a topic, and then determine which method of organization is best suited for its development. Next, write a topic sentence that applies to your treatment of the subject. Finally, list at least four supporting facts or ideas. ...
July 31, 2013

english
Need Help.Please and Thanks. Read each of the following topic sentences, create your own topic sentence that expresses something about your particular opinion on the subject. 5.Plants require water, sunlight, and carbon dioxide to live.
July 30, 2013

english
I am done with everyone but #5. I need help with that one.
July 25, 2013

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