Sunday

November 23, 2014

November 23, 2014

Total # Posts: 4,396

**calculus II**

∫ tan^2 x sec^3 x dx If the power of the secant n is odd, and the power of the tangent m is even, then the tangent is expressed as the secant using the identity 1 + tan^2 x = sec^2 x I thought that since tan is even and sec is odd, we have to put this in terms of cosine...
*March 2, 2013*

**math**

complete the pattern:1,2/3,4/9,4,4,4
*March 1, 2013*

**math**

in the number 0.123451234512345.........(recurring)what is the 1992th digit after the decimal point?
*March 1, 2013*

**math**

a taut wire of length 'W'emits a single note when plucked.if it were half as long it woould emit the same note but one octave higher.How long should the same wire be to emit the same note but one octave lower ?
*March 1, 2013*

**math**

in a set of number rods,there is one rod of length 10,2 rods of length 9,3 of length 8,and so on.If all these rods were laid end to end in one line,how long would the line be ?
*March 1, 2013*

**math**

is it day 20,or day 15
*March 1, 2013*

**math**

a gardener places lilies in a pond.He does on the first day of the month of september.it double in volume every day until the last day of the month,the pool is full.On what day of the month was the pool half full of lilies?
*March 1, 2013*

**math**

if X is 10% of two other numbers,Y and Z,and Z is 3 times the value of Y.What percentage is X of Y alone ? please show me how you work it out,thanks
*March 1, 2013*

**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*

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