Friday
September 19, 2014

Posts by Sarah


Total # Posts: 3,879

BIOLOGY
The gastrointestinal phase of gastric secretion:? a. is controlled by the entrance of acidic chyme into the duodenum. b. leads to increased gastric secretion if duodenal pH falls below 2. c. only stimulates gastric secretion. d. will decrease gastric secretion when gastrin is ...
March 1, 2013

Spanish
Can someone please check if my answers are correct? combina las palabras lógicamente. 1. la langosta 2. la salchicha 3. el ají 4. el caldo 5. el sacacorchos 6. hornear 7. los ingredientes 8. la sal 9. el durazno 10. el aderezo a. el vino b. la toronja c. la sopa ...
February 28, 2013

chem
the units are the amount the ph changes
February 28, 2013

chem
By what factor does [H+] change for each pH change? (a) 3.60 units (b) 0.33 units how do you do this?
February 28, 2013

math
chickens have 2 feet. Rabbit have 4. They both each have 1 head. Let x be chickens and y be rabbits. 2(x + y = 18) 2x + 4y = 58 The subtract the equations from each other. 2x + 4y = 58 2x + 2y = 36 ------------- 2y = 22 y = 11 so x = 7
February 27, 2013

math
5 - y/2 = 3 -y/2 = -2 y/2 = 2 y = 4
February 27, 2013

analytic geometry helps are appreciated
So the "legs" of the triangle would be 2 I believe. And the area of a triangle is (Length*Width)/2. So I think the area should be 2units^2. I'm not sure if that's what you were asking.
February 27, 2013

TO MRS SUE
Aw ha I thought you might be able to help. I've been stuck on it for a while.
February 27, 2013

Algebra
For surface area, you find the area of each side (Length x Width) and then you add up all the sides.
February 27, 2013

Math
How many vertex's does a triangle have? That's your answer.
February 27, 2013

Chemistry
That makes so much more sense!! Thanks :)
February 27, 2013

Chemistry
Calculate the mass of baking soda, NaHCO3, needed to neutralize 3.0 mL of 3.0 M hydrochloric acid, HCl(aq). Ok, so I'm super confused. I have the equation, but I'm stuck with what to do with it. Equation: NaHCO3 + HCL --> NaCl + H2O + CO2
February 27, 2013

Math
You have 6 slices. 1/3 of the slices would be 2 slices.
February 27, 2013

SCIENTIFIC NOTATION (ALGEBRA
9.04 x 10^9
February 27, 2013

Algebra/Math
Ok, so you have x as the kg. The equation should look like this: .20(x) + .60(80-x) = .53(80) Then you can multiply everything out to solve for x.
February 27, 2013

English: Please help
Thank you very much. Will you answer 2 more for me? Thanks again
February 27, 2013

English: Please help
17. If you want to find the answer to a question about grammar, usage, or mechanics for your formal writing, which professional resource would not be helpful? A.) Essential Idioms in English B.) The Chicago Manual of Style C.) A Manual for Writers of Research Papers, Theses, ...
February 27, 2013

biology
thanks! so the heterozygous and homozygous dominant genotypes are p^2 and 2pq?
February 27, 2013

biology
how do i do this?
February 27, 2013

biology
The frequency of the sickle cell disease in parts of Central Africa is as high as 10 percent compared to a frequency of .5 percent in the US. Use the percentages for the Central Africa population and the US population to calculate the frequency of the heterozygous and ...
February 27, 2013

Math
Ok so we know this. Monday = x Tuesday = x +2 Wednesday = (1/2)x +11 They all add up to 53. The equation should look like this: (x) + (x + 2) + (1/2x + 11) = 53
February 27, 2013

college algebra
So first put y=2f(x+2)-3 into f(x) graphing form. And then flip the x and the y.
February 27, 2013

Algebra
The inverse function simply represents f(-x) and means that you have to flip the x and the y. If that makes sense.
February 27, 2013

Spanish: Please Help
Please help. Thank You Which is the best answer for this question? ¿Cuántos años tiene Jaime? A.) Tienes quince años. B.) Tengo quince años. C.) Tiene quince años. 22. Las Mañanitas is A.) a special cake eaten at birthday ...
February 27, 2013

Spanish: Please Help
Please help. Thank You. Which is the correct choice? ¿Cuál es la fecha de tu cumpleaños? A.) Es el uno de diciembre. B.) Es el primero de diciembre. C.) Es el primo de diciembre. D.) Es la primavera de diciembre. Which choice is correct? ¿Cuá...
February 27, 2013

algebra
You find a line with a slope that is the reciprocal of 2/3 so the line with a slope of -3/2.
February 27, 2013

Math
A wheel has a 32 inch diameter. The speed of a point on its rim is 44 ft/sec. What is its angular speed?
February 26, 2013

Math
A horse on a merry-go-round is 20 ft from the center and travels at 10 mph. What is its angular speed?
February 26, 2013

Chemistry
In determing the simplest formula of lead sulfide, 2.46 grams of of lead are placed in a crucible with 2.00 grams of sulfur. when the reaction is complete, the product has a mass of 3.22 grams. What mass of sulfur should be used in the simplest formula calculation? Find the ...
February 24, 2013

Physics/Biohemistry
If 1/C1+1/C2+1/C3=1/Ceq and Ceq=3.18 mF, then replace the given variables as such: 1/6.54+1/8.19+1/C:unknown=1/3.18 Now it becomes an algebra problem: Multiply both sides of the eqn by 3.18, then you'll have: 3.18/6.54 +3.18/8.18+3.18/Cunknown=1 Simplify: .49+.39+3.18/C=1 ...
February 24, 2013

AP Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
February 24, 2013

Spanish
ok thank you!
February 23, 2013

Spanish
ombina las palabras lógicamente. 1. la langosta 2. la salchicha 3. el ají 4. el caldo 5. el sacacorchos 6. hornear 7. los ingredientes 8. la sal 9. el durazno 10. el aderezo a. el vino b. la toronja c. la sopa d. la receta e. la pimienta f. la ensalada g. el ...
February 23, 2013

Math
So, if Tyler has to earn $50.00 in two weeks for a gift to a friend and has already earned $18.42 so far, what equation would you use to figure out how much more money he has to earn each week?
February 21, 2013

Biology
What kinds of substances could interfere with the Dische's test for DNA? I'm wondering if proteins can interfere with this. Please help me
February 20, 2013

math
How do you write 54% as a fraction in simplest form?
February 19, 2013

math
what is the greatest common factor 42, 78, and 120?
February 19, 2013

math
a piece of limestone weighs 3/5 of a pound. A piece of slate weighs 4/7 of a pound. What is the difference in the weight of the two rocks?
February 19, 2013

math
pencils come in packages of 24. The teacher needs 80 pencils for a test. How many packages will he need to purchase?
February 19, 2013

physics
Nevermind I got it!
February 18, 2013

physics
Two capacitors have the same plate separation, but one has square plates and the other has circular plates. The square plates are a length L on each side, and the diameter of the circular plate is L. The capacitors have the same capacitance because they contain different ...
February 18, 2013

chemistry
gaseous hydrogen and fluorine combine in the reaction above to form hydrogen fluoride with an enthalpy change of -540kJ. What is the value of the heat of formation of HF(g)
February 17, 2013

Physics 1
A taut string connects a 5-kg crate to a 12-kg crate (see figure below). The coefficient of static friction between the smaller crate and the floor is 0.573; the coefficient of static friction between the larger crate and the floor is 0.443. Find the minimum horizontal force ...
February 16, 2013

Science
Can you please tell me the effects of human activities on ecosystems. Example Human Activity and Consequences....
February 14, 2013

microeconomics
1. Market demand is given as QD = 250 – 0.5P. Market supply is given as QS = 2P. In a perfectly competitive equilibrium, what will be the value of consumer surplus? a.$10 000 b.$20 000 c.$40 000 d.$80 000 2. Market demand is given as QD = 250 – 0.5P. Market supply is...
February 13, 2013

microeconomics
1. Suppose that an increase in the price of carrots from $1.20 to $1.40 per pound raises the amount of carrots that carrot farmers produce from 1.2 million pounds to 1.6 million pounds. Using the midpoint method, what would be the elasticity of supply? a. 0.50 b. 1.86 c. 0.54 ...
February 13, 2013

Pre-Calculus
Determine the equation of a line that passes through (2,2) and is parallel to the line tangent to y=3x^3-2x at (-1,5)?
February 12, 2013

Math
What is 9/25,35/100,and 2/5 in order from greatest to least
February 12, 2013

physics
If a 0.5kg toy car is rolling down a hill with a velocity of 0.8m.s, what is the car's momentum?
February 11, 2013

math
This year Martin is twice as old as his sister. If Martin is 12 years old then how old will his sister be next year
February 10, 2013

math
Use the Pythagorean Theorem to find the missing side length. someone please tell me what the Pythagorean Theorem is?
February 7, 2013

Chemistry
Equation: 3CaCl2 (aq) + 2 Na3PO4 (aq) → Ca3(PO4)2 (s) + 6 NaCl (aq) How many grams of Ca3(PO4)2 are formed when 450.0 g NaCl are formed in the reaction? please show steps, please
February 6, 2013

Chemistry
Heres a balanced equation: Na2CO3(aq)+2AgNO3 (aq) --> 2NaNO3(aq)+Ag2CO3 (s) From this equation, 10 mL of AgNO3 in this contains 34 grams of AgNO3. Calculate the grams of solid product, Ag2CO3. Part 2: 10 mL of Na2CO3 in this experiment contains 21 grams of Na2CO3. ...
February 6, 2013

math
At the time of the oil spill, the price of gasoline was 2.75 per gallon. Estimate how many dollars in gasoline is being lost per day as a result of the spill.- 2,000,000 gallons is lost per day.
February 6, 2013

Math
The greatest loss rate estimates are 4,200,000 gallons per day since the start of the spill, but after 44 days about 1,050,000 gallons were diverted into collection tankers.( The remaining amount was lost in the Gulf). Based on these data (assuming that the rate of loss was ...
February 6, 2013

Math
The greatest loss rate estimates are 4,200,000 gallons per day since the start of the spill, but after 44 days about 1,050,000 gallons were diverted into collection tankers.( The remaining amount was lost in the Gulf). Based on these data (assuming that the rate of loss was ...
February 6, 2013

Math
A driver uses about 600 gallons of gas a year to get around his car. For how many years could he drive his car on all the gasoline that is being lost in one day as a result of this spill.. In one day 2,000,000 gallons spilled.
February 6, 2013

Math
At the time of the oil spill, the price of gasoline was 2.75 per gallon. Estimate how many dollars in gasoline is being lost per day as a result of the spill.-
February 6, 2013

Math
Trigonometric identity SinD tanD Simplify please
February 5, 2013

Math
What is the rule for this function? Input: -2, Output: -4 Input: 0, Output: -2 Input: 5, Output: -3 Thank You!! :)
February 5, 2013

Math
What is the rule for this function? Input: -2, Output: -4 Input: 0, Output: -2 Input: 5, Output: -3 Thank You!! :)
February 5, 2013

Calculus
Marginal Cost Businesses can buy multiple licenses for data compression software at a total cost of approximately C(x) = 96x2/3 dollars for x licenses. Find the derivative of this cost function at the following values x=8 and x=64 I do not know where to start?
February 5, 2013

Chemistry
The metal palladium crystallizes in a face-centered cubic lattice with an edge length of 388.8 pm. What is the density of the palladium?
February 4, 2013

Chemistry
What is the value of q when 8.21g of water vaporizes at 373 K? The enthalpy of condensation of water at 373 K is -40.7 kJ/mol. I tried using the equation q= m x Cs x Delta T, but I never got the right answer which is 18.5 kJ apparently, so I need to find out what I did wrong.
February 4, 2013

Trig
How do I prove that tan(x/2) =( plus/minus) sqrt(1-cos(x/1+cos(x))
January 27, 2013

BIOLOGY
What is the majority of the mass of the heart composed of? a. Endocardium b. Myocardium c. Pericardium d. Endothelium
January 26, 2013

physics
A piece of pipe has an outer radius of 4.6 cm, an inner radius of 2.8 cm, and length of 35 cm. What is the mass of this pipe? Assume its density is 8.3 g/cm3. Answer in units of k
January 26, 2013

physics
an object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. What is the approximate increase in the object's gravitational potential energy?
January 23, 2013

English
I need help with my thesis statement for my term paper on Alcatraz. The paper focuses on Alcatraz history, Life on Alcatraz and Famous Prisoners and escapes (10th grade). I have: Alcatraz, a federal penitentiary, history of Alcatraz, life on Alcatraz, while Alcatraz was a ...
January 22, 2013

Calculus
Use the Mean Value Theorem to find out what c is. f(x)= 2sec^2 x, [-pi/4, pi/4]
January 22, 2013

chemistry, ap chemistry
At 800 K the equilibrium constant for I2(g) 2 I(g) is Kc = 3.1 10-5. If an equilibrium mixture in a 10.0-L vessel contains 3.56 10-2 g of I(g), how many grams of I2 are in the mixture?
January 22, 2013

Logic
Situation 1: You have eight billiard balls. One of them is "defective," meaning that it weighs more than the others. How do you tell, using a balance, which ball is defective in two weighings? Situation 2: You have five jars of pills. All the pills in one jar only ...
January 21, 2013

structure and function of the human body
With your understanding of bone and muscle tissue (cells and the extracellular material) discuss two lifestyle factors (one for bone and one for muscle) that affect the growth, development, size and/or healing (positively or negatively) of the tissue. Also state whether the ...
January 20, 2013

calculus
limx→∞3x+127x+11
January 19, 2013

Math
An archer misses the target on her first shot and hits the target on the next 3 shots. What is the least number of consecutive shots that she must now make in order to have hit the target on at least 9/10 of all her shots? ( please show work on how to derive the answer!! Thx...
January 19, 2013

Math
At a college basketball game, the ratio of the number of freshmen who attended to the number of juniors who attended was 3 to 4. The ratio of the number of juniors who attended to the number of seniors who attended was 7 to 6. What was the ratio of the freshman to the number ...
January 19, 2013

physics
1 is angle 1 and 2 is angle 2
January 16, 2013

physics
Consider two vectors where F1 = 53 N, F2 = 81 N, 1 = 320 , and 2 = 13 ,measured from the positive x axis with the counter-clockwise. What is the magnitude of the resulting vector?
January 16, 2013

maths
A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125. Determine with 99% confidence the number of families that must be sampled to estimate the mean weekly family expenditure ...
January 16, 2013

Math
Simplify. Express answer with positive exponents -48x^8y^-3/ 12x^-4y^6 Is x^12\4y^9
January 15, 2013

Math
Expand an simplfy. 3(x-6)(x+4)-(3x-5)^2 Is the answer -6x^2+24x-39
January 15, 2013

Liberal arts math
if this is the eaquation of a line y=2x+3 what is the parallel line and perpendicular line?
January 13, 2013

english
write a composition about whirlpools !
January 11, 2013

Social Studies
Examine The Black Family And Black Religion. Consider How Slavery Affected Both White And Black Views Of Women And Family.
January 9, 2013

Math
The sum of the integers from 40 to 60, inclusive, is 1050. what is the sum of the integers from 60 to 80 inclusive? Please help me find the pattern and how to use it instead of adding 60+61+62+63..... etc.
January 9, 2013

Math
The sum of the integers from 40 to 60, inclusive, is 1050. what is the sum of the integers from 60 to 80 inclusive? Please help me find the pattern and how to use it instead of adding 60+61+62+63..... etc.
January 9, 2013

MAth
what equation is that?
January 9, 2013

MAth
The front row of a stadium has 25 seats. Each of the other rows has two more seats than the row in front of it. how many seats are there altogether in the first 20 rows? i know how to do this in the "long" way but how do you do this is a "shorter" way by ...
January 9, 2013

calculus
three forces with magnitudes 100, 50, and 80 lb act on an object at angles of 50 degree, 160 degree, and -20 degree respectively. ind the direction and magnitude o the resultant force.
January 8, 2013

pre-cal
Three forces with magnitudxes 100, 50 and 80 lbs act on an object at angles of 50 degree, 160 degree and -20 degree respectively.
January 8, 2013

algebra 2
ok well sorry:P
December 31, 2012

algebra 2
Oh wait for the axis of symmetry put the vertex form to standard form and then do -b/2a For example: x^2+6x+13 A=1 B=6 C=13 Axis of Symmetry equation x=-b/2a x=-6/2(1) x=-3
December 31, 2012

algebra 2
vertex(6,-5) Direction is opening down(maximum) I don't know the axis of symmetry...but I hope this helped:)
December 31, 2012

AP Chemistry
How can you find the average temperature of a refrigerator or any fridge by using colligative properties?? I am doing a lab in school and i'm not sure how to approach or start this. I know that you have to have two solutions where on one solution, you put a tremendous ...
December 30, 2012

chemistry
sodium carbonate and hydrochloric acid react to give sodium chloride, carbon dioxide and water. How many grams of sodium carbonate and hydrochloric acid would be required to produce 286g of carbon dioxide? step by step answers please:)
December 29, 2012

Calculus-Regressions
How do you find the best and simplest model given a table of data? I know how to find a specific regression (linear, cubic ect...) but i'm lost when it comes to choosing the best one.
December 25, 2012

Chemistry
One of the flavouring compounds that have been isolated from aniseed oil is anethole. a.What is the configuration of the molecule, cis or trans? b. The compound will react with bromine. i.What would you observe? ii.Write an equation for the reaction.
December 19, 2012

math
help please! Factorise (x+4)(3x^2-11x+6)
December 19, 2012

Math
3.1 ft
December 16, 2012

Precalculus
log3 (x+1) - log3 (x-3) = 2
December 11, 2012

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