Posts by carlos

Total # Posts: 343

Chem
A 0.649 m aqueous solution of a monoprotic acid (HA) freezes at -2.34°C. Find the pKa of this monoprotic acid. Kf of water = 1.86 °C/m

word problem
Eduardo scored 29 points in his last basketball game. He only scored 2-point field goals and 3-point feild goals. If he made 12 field goals in the game, how many of each type did he make? Let x represent the number of 2-point field goals and y represent the number of 3-point ...

Thank you!!

In certain parts of the ocean the pressure of sea water, in pounds per square foot, at a depth of "d" feet below the surface, is given by P=13+ 4d/9 If a scientific team uses special equipment to measure the pressure under water and finds it to be 401 pounds per ...

exponent
ok thanks anyways

exponent
v^-7 x v^7 its saying to write as a positive exponent only?

algebra
What quantity of 40% acid solution must be mixed with a 10% acid solution to produce 540 ml of a 20% acid solution? I'm not sure how to set this up

algebra
The admission for a school play is \$2.50 for children and \$9.00 for adults. On a certain day, 288 people attended the play, and the total money collected from sales was \$1760. How many children and how many adults were admitted?

{-9x-3y=147 -x+7y=-101 The solution of the system is:

Linear equations
thanks so much!

Linear equations
I keep getting this wrong and can't figure out why {60x+10y=-16 -50x-100y=50 The solution to the system is:

substitution and elimination methods
i got it thanks

substitution and elimination methods
do you plug it into the first equation or the second?

substitution and elimination methods
Can someone please help explain this, my notes aren't helping me much. Given the following system of linear equations: {x-4y=20 -3x+4y=-12 The solution to the system is: The system is: The equation is: Please help

word problem
Thank you!

word problem
A man has 37 coins in his pocket, all which are dimes and quarters. If the total value of his change is \$6.70, how many dimes and how many quarters does he have? Let x represent the number of dimes and y represent the number of quarters. its asking me just to set up the ...

-9.4(z-8)-4.1=5(z+2.5)-5.9 z= z= (asking for rounded 4 decimal points)

word problem
In 1994 the moose population in a park was measured to be 6400. By 1996, the population was measured again to be 6800. If the population continues to change linearly: Find an equation for the moose population, y,in terms of x, the years since 1994. Ive been helped on getting ...

Now it is asking what will be the prediction for 2006?

thank you

In 1994 the moose population in a park was measured to be 6400. By 1996, the population was measured again to be 6800. If the population continues to change linearly: Find an equation for the moose population, y,in terms of x, the years since 1994.

algebra
Thanks scott

algebra
A car rental company offers two plans for renting a car. Plan A:40 dollars per day and 20 cents per mile. Plan B: 56.32 dollars per day and 12 cents per mile. If you plan to rent the car for one day, and "m" represents the number of miles driven in that day, for how ...

thanks!!

A towns' population, P(x), is given by the function P(x) =2700x + 21000 where x represents the years since 2003. The population will reach 83,400 in ______ The population in 2010 will be ______

math
John let out 50 foot of kite string when he observes that his kite is directly above a point on the ground 30 feet away from him, how high is the kite ?

Algebra
I think real answer is D since -if you use fraction for a the value is larger than 1 -if you use number larger than 1 for a then the value gets smaller than 1 -if you use 1 both columns are equal

Algebra
J is the set of all fractions in the form of a/(a)square where a cannot not equal to 0 Column A: a (any member of set J) Column B: 1 A. Quantity in column A is greater B. Quantity in column B is greater C. two quantities in both columns are equal D. relationship cannot be ...

algebra
ok i corrected it, thanks again

algebra
Awesome I got it! thank you

algebra
How would you graph this, i keep entering it only and keep getting it wrong. x and y axis are numbered 1 to 10. please help y+5=-2/3(x-4)

Physics
An ideal gas in a moveable piston is allowed to reversibly expand by slowly heating at constant pressure. a. Derive the equation for the work done reversibly as a function of the initial and final temperatures.( i have used w=-nrtln(v final/v intial) i dont know how can I take...

Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to a) Get a C average on exams? f b) Get a B average on exams? f c...

word problem, Im lost on how to set this up
ahh now I see it! 17, 57, 97. not sure what I was thinking there. Thanks for your help!

word problem, Im lost on how to set this up
sorry but I did not, I worked out what you posted and entered them in online and my answers were rejected. ps. i didn't realize I could respond to you on this

word problem, Im lost on how to set this up
Joe has scored 84, 89, and 90 on his first three exams in his math class. If the standard 70,80,90 scale is used for grades and the exams are equally weighted, what must he score on the final exam, f, in order to a) Get a C average on exams? f b) Get a B average on exams? f c...

The local hospital currently has 25 nurses. The hospital administrator sees that they are adding 4 nurses each year to their staff (which included the loss from nurses leaving the hospital). The administrator knows that they need to have at least 41 nurses on staff to meet a ...

A cash register contains only five dollar and ten dollar bills. It contains 25 more five dollar bills than ten dollar bills, and the total amount of money in the cash register is \$560. How many of each bill is in the cash register?

Chemistry
A 5.0×101 kg sample of water absorbs 324 kJ of heat. If the water was initially at 22.2 ?C, what is its final temperature?

physical educatioin

math
Yes

math
My problem is finding the greatest number of rectangular space that can be cut from 36L×60W

math
If i have a rectangular of 36 inches long and 60 inches wide how do i find the greatest number

Math
A farmer has 7 pigs. He has twice as many goats as pigs. How many goats does he have?

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)

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.

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: ...

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

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?

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

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

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

Math
S = 2πr2 + 2πrh

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?

Algebra
12

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 ...

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. ...

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

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

Hey
Empty calories are defined as

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

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

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?

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?

Math
X^2-34x+100=0 solve

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.

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? ...

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?

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

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?

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.

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

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 ...

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

Chemistry
25.2

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

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?

algebra1
-7x+y=19 -2x+3y=19

algebra1
-3x+7y=-16 -9x+5y=16

Algebra 1
-4x + 9y=9 x-3=-6

Algebra 1
5x + y= 9 10x-7y=18

Algebra 1
7x + 2y = 24 8x + 2y = 30

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?

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.

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?

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

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

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

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

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 ?

Math
Log2base10=0.301 and log3base10= 0.477. Evaluate log45base10

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

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 ...

Physics
Thank you so much.

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 ...

Spanish
Ustedes necesitan hablar con el profesor de economía.

chemistry
How do you calculate the mass percent composition of nitrogen in NO2?

English
I think C or D

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 ...

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

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