Friday
December 2, 2016

# Posts by sal

Total # Posts: 101

Chemistry
How do you create a calibration curve? How do you use a calibration curve to convert absorbance to concentration in mg/mL?
November 7, 2016

Mathematics
Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in ...
October 24, 2016

Social Studies
The citizens of Rome put the good of the republic ahead of their own desires and the Founding Fathers hoped American people would do the same. Serving in public office without financial gain was important in the success of the country
October 2, 2016

Social Studies
They are just asking for help jeez. I guarantee it that their are times when look on the internet for assistance with answers! Don't worry I will give help Hello out when I get the answer.
October 2, 2016

physics
can someone else me solve this equation? E=mgh
September 12, 2016

Math
If apples are 25 cent's, watermelon is 4 dollars, and cantaloupe is 50 cents . what 25 fruits can I buy with 25 dollars ??
August 20, 2016

calculus 1
the average temperature in Hartford can be expressed as t = f(m) where m is month (January = 1, etc.) and t is the average daily high temperature for the month in degrees F. 1) what is the meaning of f'(m)? rate of change of the average temperature (in degrees F) as the ...
February 8, 2016

Math
Please help. Julio uses a scale of 1/ 8 inch  1 foot when he paints landscapes. In one painting, a giant sequoia tree is 34.375 inches tall. How tall is the real tree?
February 6, 2016

Math
Find the solution or solutions of the equation: 3^x=3/2x+6 Thank You ;)
February 3, 2016

algebra
Write an expression in simplest form that represents the perimeter of the polygon. the measure of the sides are 3x, x + 10, 2x + 2, and 5x. Would the simplified expression be 11x + 12?
December 15, 2015

Algebra
I had this question too, just chose whatever is close to being right, which is 2.
December 15, 2015

Algebra
There's no typos or no other possible answers...
December 15, 2015

Math
Please check my answer for this: 17 - 4 x 3 + 8 = The answer I come to is 13
November 2, 2015

I have 3 coins, They total less than 25 cents. I cannot make 15 cents. I can make 6 cents. What are my coins.
October 28, 2015

Health
THANK YOU SO MUCH KATIE
October 22, 2015

Art
1. D? 2. B?
March 9, 2015

Art
1. Which movie professional creates the storyboard? A. Screenwriter B. Production designer C. Director D. Graphic artist 2. How might a cinematographer create a believable scene in natures? A. Through research of plants and animals B. Through adjustment of props C. Through ...
March 9, 2015

chemistry
i dunno
March 7, 2015

math
the waiting time for a roller coaster is 20 minutes if 150 people are in line how long will you wait if 240 people are in line
January 14, 2015

probability
For each 100 8th grade girls in a certain middle school, 85 play soccer, 70 have a cell phone, 75 have a tablet computer, and 80 play a musical instrument. What is the least possible number of these 100 girls who play soccer, have a cell phone, own a tablet computer, and play ...
January 10, 2015

Language arts
Which of the following events is part of the novels falling action? A. Paul reveres ride to Lexington B. Johnnys injury of his hand and need to find another trade C. Johnnys acceptance of Dr. Warrens offer to operate on his hand D. General gage and the soldiers arrival in ...
January 7, 2015

Trigonometry
Graph the following functions .include two full periods .a)y=3cos(2x) and b)y=-4sin(4x) on same graph
December 9, 2014

Organic Chemistry
I have a Lab assignment that requires the synthesis of carboxylic acid and our final product is Benzoic Acid. The following equation was provided: C7H8 + KMnO4 ---> MnO2 1) KMnO4, OH-, heat 2) H3O+ We were asked to balance the equation including the by-products. I was able ...
November 7, 2014

trig
if (-12,5) is a pointon the terminal side of an angel 0 find the exact value of six trig funcation of 0
June 19, 2014

chemistry
Convert pressures from mmHg to atm then use combined gas law to solve for the new volume. You get 2.06 Liters
May 8, 2014

algebra
solve 1/3(2x-5)=3
October 11, 2013

physics
A 53.0-kg person jumps from rest off a 12.0-m-high tower straight down into the water. Neglect air resistance. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative
July 10, 2013

English
Signal Phrase: Read "Too Much Pressure" by Colleen Wenke (564-568). Consider it a model for using signal phrases to introduce quoted material as explained on pages 508-512 of the Bedford Handbook. 1. Copy two good examples from Wenke's essay of signal phrases ...
July 3, 2013

Math
\$23095.36
May 21, 2013

Grammar
February 8, 2013

Math
if a dog is sitting on a porch and 20 meters away a cat is playing. if the dog travels at 4m per second and the cat travels at 2m per second. how many seconds does the cat have before he should be up a tree
February 5, 2013

Geometry
Ah wait i got the equation for BD as y=-2/7 x + 16/7 is that right?
January 30, 2013

Geometry
The gradient/slope for BD is -2/7
January 30, 2013

Geometry
I get the gradient part reiny, but how do you use one of the points to get the equation?
January 30, 2013

Geometry
The points A,B,C,D have coordinates (3,3) (8,0) (-1,1) (-6,4) respectively. Find the coordinates of the point of intersection of the diagonals AC and BD? Help plZ!!!
January 30, 2013

Geometry
January 30, 2013

Geometry
Im sorry!!! Its so late and im half asleep. Worse time to do maths. I get it reiny!!!!!!! Thank you So the second point is -4 = -4 therefore it must be the correct equation as both points satisfy the equation?
January 30, 2013

Geometry
What is RS and LS?
January 30, 2013

Geometry
Is there a way of simplifying the equation 4y-3x=-10 to y=0.75x - 2.5, then proving that is the equation for DA?
January 30, 2013

Geometry
Could you please explain that in full, as im really struggling to understand. The other two points were for calculating gradients AB, CB, DC and DA but i got that. Thanks reiny!
January 30, 2013

Geometry
You are given the cordinates of the four points A (6,2), B(2.4), C (-6, -2) and D (-2,-4). Show that the equation of the line DA is 4y-3x = -10 help please!!
January 30, 2013

english
Odysseus sent three men to see what the land [possible capitalization of L here] of the Lotus Eaters, who LIVED on the flower, WAS [watch your tenses] about. The three men had gotten fed the Lotus and now they had no desire to go back to the ship or TO go back home. That is ...
December 9, 2012

PHYSICS
What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
November 25, 2012

PHYSICS
What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
November 25, 2012

chemistry
Image one is b and Image Two is C
November 22, 2012

physics
to prevent dust and soot particles from polluting the atmosphere, industry often employs static electric charge in their smokestacks. explain the physics principle involved in this application
October 20, 2012

English Literature
February 17, 2012

Physics
3.9x10^7
December 9, 2011

calculus
A car leaves an intersection traveling east. Its position t sec later is given by x = t2 + t ft. At the same time, another car leaves the same intersection heading north, traveling y = t2 + 3t ft in t sec. Find the rate at which the distance between the two cars will be ...
October 19, 2011

temperture
c= 5over9 (f-32)
October 17, 2011

spelling
many rules are loosely enforced.
October 17, 2011

geometry
what is the height of a cone with a volume of 66 cubic centimeters and a base with a radius of 3 centimeters
October 17, 2011

math
168p divided by -14
October 12, 2011

Biology: Ecosystems
That's ok. I already found the answers. Although I did try that before and it didn't help.
August 25, 2011

Biology: Ecosystems
What are three groups of organisms that are photosynthetic autotrophs? What are the primary producers of the deep-sea vents?
August 25, 2011

biology
Thanks for the help!
August 12, 2011

biology
What are two behaviors in either a plant or animal that demonstrates a circadian rhythm?
August 12, 2011

math
A surveyor has a unit pace of 0.9 m/pace. (a) she counts 37 paces while walking From point C to point D. What is the distance between C to D? (b) how many paces should the same surveyor. count to lay out a line roughly 122m long?
July 4, 2011

I am very sorry. Chem is just not my thing and i looked in my notes the book and everything
April 14, 2011

WHO MADE THESE ATOMIC DISCOVERIES? An atom has a nucleus that is very small In a reaction, the mass of the products must equal the mass of the reactants. Electrons are negatively charge pieces of matter. An electron has a mass that is very small compared to the size of the ...
April 14, 2011

Calculus
The area of largest isosceles triangle that can be drawn with one vertex at the origin and with others on a line parallel to and above the x-axis and on the curve y=27-x^2 is.... A) 108 B) 27 C) 12 root 3 D) 54 E) 24 root 3
March 8, 2011

algebra
Five socks colored blue, brown, black, red, and purple are in a drawer. How many combinations of three socks can be randomly selected from the drawer?
February 8, 2011

algebra
Solve for n: 5to the second power n + 1= 1/25 express answer as a common fraction.
January 30, 2011

the charges for a phone call are \$.52 for first min. and \$.35 for each additional min. A)graph this step function for 6 minutes.Let x represent time, and f(x) the charge B) for the domain 0<x<=6, what is the range? C)is the relation formed by interchanging x and f(x) ...
November 21, 2010

chemistry
How many grams of rust form when 453 kJ of energy are released?
November 15, 2010

chemistry
0.000197
November 10, 2010

Physics
When physicians diagnose arterial blockages, they quote the reduction in flow rate. If the flow rate in an artery has been reduced to 30% of its normal value due to plaque formation, and the average pressure difference has increased by 40%, by what factor has the plaque ...
November 6, 2010

chemistry
November 3, 2010

calculus
Consider the following function. f(x) = (x+2)/(x-3) (a) Find f '(x) (b) Find f '(4)
October 27, 2010

science
From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest boiling point e) highest ...
October 5, 2010

astronomy
what does the phenomenon of interference demonstrate? a)the wave nature of light b)the polarization of light waves c)the quantization of the atomic orbitals d) the particle nature of the photon e) the process of ionization -how about for diffraction?
September 12, 2010

chemistry
(0.95 L x 323 K) / 298 K = 1.03 L of Argon gas
June 12, 2010

psychology
what is the difference between absolute continuity and differential continuity in regards to personality traits?
June 1, 2010

Chemistry
Identify each enthalpy change by name and classify each change as exothermic or endothermic. a)1 mol C3H8 (l) ==> 1 mol C3H8 (g) b)1 mol Hg (l) ==> 1 mol Hg (s) c)1 mol NH3 (g) ==> 1 mol NH3 (l) d)1 mol NaCl(s) + 3.88kJ/mol ==> 1 mol NaCl (aq) e)1 mol NaCL (s) ==&...
May 23, 2010

Chemistry
Identify each enthalpy change by name and classify each change as exothermic or endothermic. a)1 mol C3H8 (l) ==> 1 mol C3H8 (g) b)1 mol Hg (l) ==> 1 mol Hg (s) c)1 mol NH3 (g) ==> 1 mol NH3 (l) d)1 mol NaCl(s) + 3.88kJ/mol ==> 1 mol NaCl (aq) e)1 mol NaCL (s) ==&...
May 23, 2010

calculus
find the slope of the tangent line to the curve (sqrt 2x+4y) + (sqrt 4xy) = 9.16 at the point (1,5) dy/dx method implicit differantiation?
May 9, 2010

geography
What are the various problems and difficulties that can occur with a society in the middle of the ocean, or a society under the ocean. (Ex. Waste management, or agriculture) I need about 5. Also, what is the necessary technology needed to make the environment not only liveable...
April 5, 2010

physics
A baseball is thrown with an initial velocity of magnitude v at an angle of 27.2 with respect to the horizontal (x) direction. At the same time, a second ball is thrown with the same initial speed at a different angle with respect to x. If the two balls land at the same spot, ...
January 30, 2010

physics
A helicopter is flying horizontally at 7.5 m/s and an altitude of 17 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 13 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the package ...
January 29, 2010

Physics
This is a very confusing question and I have no idea how to tackle it. - In a nuclear reactor, neutrons released by nuclear fission must be slowed down before they can trigger additional reactions in other nuclei. To see what sort of material is most effective in slowing (or ...
October 30, 2009

Physics
also sorry to add, the drop off point from slide is 1.5m from ground.
October 22, 2009

Physics
If the height of the water slide in the is = 3.9m , and the person's initial speed at point A is 0.60 m/s , what is the horizontal distance between the base of the slide and the splashdown point of the person?
October 22, 2009

Physics
This question has been blowing my mind, and my teacher is offering no help whatsoever. Experiments performed on the wing of a hawkmoth (Manduca sexta) show that it deflects by a distance of = 4.9 mm when a force of magnitude = 3.2 mN is applied at the tip. A: Treating the wing...
October 22, 2009

Science-Physics?
Still so confused @_@. Does the dimension as length mean, when calculated the answer = length?
October 18, 2009

Science-Physics?
Hi simple question which of these have the dimension as length? A) a*t^2 B) v^2/2*a C) a*v D) (v^2*m)/F
October 18, 2009

Physical Science
Almost all the water vapor in the atmosphere is in the exosphere, ionosphere, stratopause, or troposphere?
June 2, 2009

chemistry honors
a student collects 400 mL of oxygen at 9.80 kPa. if the tempeture remains constant, what volume would this gas occupy at 9.40 kPa
May 14, 2009

science
What does "statistical analysis" mean?? I tried to look at dictinary. com but i didn't get anything that i understood... PLEASE HELP ME!!
March 25, 2009

U.S.History
#1 c #2 b #3 c #4 I'm leaning towards b
February 2, 2009

ALGEBRA
Thank you .. If i had to solve for x what would be my answer if I had to choose from.. Ano solution B{-2,-3} C{2,3} D-2 E3 F0
January 5, 2009

ALGEBRA
Can someone please solve these for me? Thank you. x^2 + 5x + 6 = 0 [SQRT(x + 3)] = 2[SQRT(x)]
January 5, 2009

Algrebra
What would i do with the 2 ?
December 31, 2008

Algrebra
I would appreciate your help with this. Thank you Solve each equation and check for extraneous solutions. [SQRT(x - 3)] - 7=0 2[SQRT(w + 4)]=5 [SQRT(x)]=-2
December 31, 2008

math
John has \$2.50 in nickels and dimes in his wallet. He has twice as many dimes as nickels. How many of each coin does he have? Let dimes = _____. Let nickels = _______. Equation:________________
November 11, 2008

Chemistry
for the reaction 2Na(s) + Cl2(g) -> 2NaCl(s), how many grams of NaCl could be produced from 103g of Na and 13L of Cl2 (at STP)
January 31, 2008

math
what is the rule for using diameter to find circumference? If the diameter is 2* the length of the radius then d/2 then C=2pie+r. CATCH YOU ON THE FLIP SIDE
November 26, 2006

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