Saturday

April 19, 2014

April 19, 2014

Total # Posts: 680

**algebra 2/trig**

Tina can paint a room in 8 hours, but when she and her friend Emily work together, they can complete the job in 3 hours. How long would it take Emily to paint the room alone?

**pre calculus**

determine whether the equation defines y as a function of x. √x + y = 12

**pre calculus**

A taxi company charges $2.00 for the first mile (or part of a mile) and 20 cents for each succeeding tenth of a mile (or part). Express the cost C (in dollars) of a ride as a piecewise-defined function of the distance x traveled (in miles) for 0 < x < 2

**Biology**

Read the DNA sequence given below in the 3' to 5' direction and please tell me all of the potential start codons (i.e. every time you see the DNA version of a start codon, even if it does not immediately come after a promoter). 3'-TTCCGTAACTTCGGCGCATCTAGCTTGAGCTCCA...

**Biology**

What 3' to 5' DNA sequence would correspond to a 5'-AUG-3' start codon?

**Biology**

(This question ties into the previous question I posted about mRNA). Use the Universal triplet code to determine the sequence of amino acids that would be generated for each of the mRNA sequences that you generated in question 2. Remember that the reading of mRNA goes in the 5...

**Biology**

Does it matter which strand is the 'code strand'? The following two sequences look identical, except one runs 3'-5' and the other 5'-3'. For each DNA sequence given below, write the mRNA sequence that would be coded from it. Make sure you indicate the d...

**Biology**

For the DNA sequence given below, write the complementary DNA sequence that would compliment the double-strand DNA 3'--ATTGCTTACTTGCATGGTACCTCTAGCGTTTAGGC--5'

**Pre-Calc**

3x+4y

**Pre-Calc**

why is the line <x,y,z>=<8,9,10>+t<3,4,5> perpendicular to the plane 3x=4y+5z=10

**chemistry 2**

You are instructed to create 800. mL of a 0.69 M phosphate buffer with a pH of 7.6. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. what is the molarity needed for the acid component of the buffer?What is the molarity needed for the base c...

**pre calculus**

Candy and Tim share a paper route. It takes Candy 70 min to deliver all the papers, and it takes Tim 80 min. How long does it take the two when they work together?

**pre calculus**

Jack invests $1000 at a certain annual interest rate, and he invests another $2000 at an annual rate that is one-half percent higher. If he receives a total of $190 interest in 1 year, at what rate is the $1000 invested?

**pre calculus**

solve nonlinear inequality x^4 > x^2

**Chemistry**

If a 0.192 g sample of copper metal reacts with elemental sulfur to form 0.240 g of the sulfide product, (a) find the percent by mass of copper and sulfur in the product and (b) find the empirical formula of the copper sulfide

**Physics**

Determine the displacement of a plane that experiences uniform acceleration from 77 m/s to 110 m/s in 16 seconds.

**Math (pre calculus)**

ax+b/cx+d=2 solve for x

**calculus**

ax+b/cx+d=2 solve for x

**pre cal**

a+1 a-1 B+1 _________ = _______ + _________ B B a Solve for A. Note: I set up problems with underlines so they can look like fractions. That's what they are.

**Math**

Every moment of every day, light pours out from the Sun at the center of our solar system and travels to Earth. It does not arrive at Earth instantaneously though; it takes time to get here. Your task is to figure out how long it takes for light to travel from the Sun to Earth...

**AP Chemistry- Equilibrium**

If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.

**AP Chemistry- Equilibrium**

If 10.0 mL of 0.18 M MgCl2 are mixed with 20.1 mL of 0.56 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 ✕ 10-11 for Mg(OH)2.

**chemistry**

What [Ag1+] is required to start precipitation of AgOH from a saturated solution of Mg(OH)2? Ksp = 2.4 ✕ 10-8 for AgOH and Ksp = 2.6 ✕ 10-11 for Mg(OH)2

**Math (pre calculus)**

please simplify (1/1+x+h) - (1 /1+x ) divided by h

**pre calculus**

Correction: the question is to simplify the FRACTIONAL expression.

**pre calculus **

Simplify the rational expression 3 (1 + x)^1/3 - x (1 + x)^-2/3 divided by (1 + x)^2/3

**Math (pre calculus)**

State whether the given equation is true for all values of the variables (disregard any value that makes a denominator zero) equation one (2/ 4 + x) = (1/2) + (2/x) equation two (1 + x + x^2 / x) = (1/x) + 1 + x

**Math (pre calculus)**

Solve 2^3-x = 5^2x+1 Give an exact solution.

**Math (pre calculus)**

The population of a certain town grows from 10,000 in 1982 to 35,000 in 1995. At this rate, in what year will the population reach 300,000? Tip* Population growth formula: P = P(subzero)multiplied by e^(k)(t)

**Pre algebra**

Vernon drew an 8in. Wide by 5in.tall picture that will be turned into a 48 ft wide billboard.How tall will the actual billboard be?

**Chemistry, Science**

How many Cl- ions are present in 2.35 mol of CaCl2 and please show steps ! Need help so I can study for a huge test tomorrow

**statistics**

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 89% of children at risk. A concerted e...

**Algebra 2 H**

No, its not suppose to have a denominatory

**Algebra 2 H**

well no its a parabola. so there are no discontinuius? How would I find the x-values if they are not.

**Algebra 2 H**

Find x-values if any at which the function f(x)=13x^2-15x-15 is not continuous. Which of the discontinuities are removable? THANKS YOU!!

**math**

. Cimarron Homes Inc. purchased a snow plow for $57,000 and financed the full amount for 5 years at an annual simple interest rate of 9%. a. Find the interest due on the loan. b. Find the monthly payment

**calculus HELP!**

A person stands on a bridge that is 100 feet above a river. If she drops a pebble how fast is it moving after 2 seconds? How long does it take the pebble to reach the river below? She has another pebble that she tosses up with initial speed of 8 feet per second. It goes up, th...

**Math**

I understand what you did but which one would i round it to the 20 speeches or 21 speeches?

**Math**

A speaker has a collection of 62 jokes. He uses 3 jokes in each speech. Please help i got a is 37820 but really need help with part b (a) In how many ways can he select 3 jokes for a speech? How many speeches can he give without using a joke twice? (Round your answer down to t...

**Math**

A sociology seminar has 7 members (a) They begin each meeting with each member shaking hands with all the other members. No one shakes another member's hand twice. How many handshakes take place? (b)The professor shakes hands with each member of the seminar and in a differ...

**4th grade math**

62 < ( 62+ 14 )

**4th grade math**

62 < ( 62+ 14 )

**Chemistry**

Calculate the molarity of a solution prepared by dissolving 16 g of urea, NH2CONH2, in 39 g of H2O. The density of the solution is 1.3 g/mL. I've tried this question so many times but I keep getting it wrong please help me

**science**

would the order be Algae, small fish, large fish, sea lion, and shark

**science**

Hello, I need help with 2 food chain orders the first one is : plants, hawk, toad, grasshopper and snake. Would the order for that be plants, grasshopper, snake, hawk, and toad. Second food chain is algae, shark, small fish, sea lion, large fish. Would that order be algae, sma...

**science**

how to make a problem about butterfly, using the scintific method

**english**

how does the woman have the power to ruin men in the book of the great gatsby and the crucible?

**english**

i have to write about the crucible and the great gatsby all in one essay

**english**

what grabber can i make for the essay I'm making for the book the great gatsby?

**english**

what can i make my grabber for an essay I'm doing on the great gatsby?

**Geometry**

The surface area of a cone is 16.8pi in squared. The radius 3 in. What is the slant height?

**Geometry **

One right circular cone is set inside a larger circular cone. The cones share the same Axis, the same vertex, and the same height. Find the volume of the space between the cones of the diameter of the inside cone is 6in., the diameter of the outside cone is 9in and the height ...

**Chemistry**

A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?

**Chemistry**

A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?

**math hw (algebra)**

On the sidewalk the distance from the dormitory to the cafeteria is 400 meters. By cutting across the lawn, the walking distance is shortened to 300 meters. how long is each part of the L shaped sidewalk?

**math (algebra)**

An auto dealer wants to string a wire from the top of a pole to the ground and hang colorful pennants from it. The distance from the base of the pole to the point where the wire is attached to the ground is 3 times the height of the pole. If the wire is 63 feet long, how tall ...

**chemistry**

what will be the internal pressure causes by hydrogen gas when 5.00 g of zinc is dissolved in 50 g of concentrated hydrochloric acid if the volume of the container is 250 mL and the container is allowed to cool 20 degrees celcius

**Math**

The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth $2,600. Five years after it was bought, it was worth $2,000. If the relationship between number of years past 1998 and value of the computer is linear, write ...

**Algebra **

The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth $2,600. Five years after it was bought, it was worth $2,000. If the relationship between number of years past 1998 and value of the computer is linear, write ...

**algebra graphing**

according to some students, what is the true purpose of homework?

**Algebra**

The length of a rectangular flag is four yards longer than the width. The area f the flag is 140 square yards. Find the length and the width.

**Physics - Electric Potential**

A charge of - 0.15 C is moved from a position where the electric potential is 13 V to a position where the electric potential is 60 V. What is the change in potential energy of the charge associated with this change in position?

**math**

C.3.75x + 7x; $10.75

**algebra**

A model car is constructed with a scale of 1 : 15. If the actual car is 12 feet long, which proportion represents the length x of the model car?

**geometry**

the perimeter of parallelogram QRST is 26cm. If ST=e 6cm what is the length of RS

**physics**

P1/T1 = P2/T2 P1 = 3.0 ATM T1 = 20+273 = 293K P2 = ? T2 = -33+273=240 3.0/293 = P2/240 P2 =(3.0/293)*240 P2 = 2.457337 = 2.46 ATM

**trig**

a lighthouse is located at point A. a ship travels from point B to point C. At point B,, the distance between the ship and the lighthouse is 7.5km. At point C the distance between the ship and the lighthouse is 8.6km. Angle BAC is 58 degrees. Determine the distance between B a...

**Math**

I need to figure this equation out and I do not understand what the backwards E means ODR= # of people aged ∃65 --------------------- x 100 # of people aged 15-64

**Math**

Use the method of elimination to solve the following system of equations. You must check your answer: 1)x/2 + y/5 = 1/2 2) 3x - y = -8

**Math**

Translate this situation into a system of equations of the first degree in two variables and make sure you identify the variables clearly: Today, the difference in age between a father and his son is 23 years. Two years from now, the father's age will be double the age of ...

**English**

omg yall are life savers connections academy is so difficult

**science**

How much sugar must be added to 50g of water to make a saturated solution at 0 degrees?!

**Math**

If Peter picked 240% more plums than Roger and Peter picked 6800 how many did both pick altogether

**physics**

A 5-kg box is released on a 30 degree incline and accelerates down the incline at 2.79 m/s^2. To the nearest tenth of a Newton, what is the friction force impeding its motion?

**Math (Algebra 1)**

How did you get that?

**Math (Algebra 1)**

2y-z/x for x=-3, y-13, and z=5

**physics**

a skateboarder starting from rest accelerates down a ramp at 2m/s squared for 3sec. what is the final speed of the skateboarder?

**Physics**

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 28.2 %. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is t...

**Physics**

A 27.0kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 71.0N and is directed at an angle of 30.0deg above the horizontal. Determine the coefficient of kinetic friction.

**Calculus**

Integrate the expression β = 1/V (δV / δT) at constant pressure, assuming that β is independent of temperature. By doing so, obtain an expression for V as a function of T and β at constant P.

**chemistry**

Determine the mass of CuSO4.5H20 needed to make 250 mL of a .100M CuSO4.5H20 aqueous solution..

**math**

well the cookies are peanut cookies

**math**

sorry how do you do the start of the question about the 10 cookies and the 50 cookies

**math**

the 100g butter 50g sugar 150g flour 50g peanuts

**math**

sorry if its so long but could you please explain

**math**

sorry do you mind if i just ask you another as i'm really stuck with these questions thanks. here is a list of ingredients you need to make 20 peanuts. 100g butter 50g sugar 150g flour 50g peanuts a)list the ingredients you need to make 10 cookies 50 cookies b) eva wants t...

**math**

james is making fruit juice, using fruit cordial and water. the label on the cordial says "to make 1 litre of fruit juice, use 200 ml of cordial and 800 ml of water" james uses 250 ml cordial and 850 ml of water. is james using the correct proportions? show working t...

**Chemistry**

So should I use the decimal form 0.6003? Or the 60.03%?

**Chemistry**

How do I calculate the overall confidence limit and the overall relative confidence limit for the percent chloride? I've found the percent mass of chloride in the unknown to be 60.03 % and the formula we were given uses the mean but I have no mean in this case so I am conf...

**Chemistry**

w = work, it's a physical chem question, here c does not mean concentration, it is the heat capacity of pressure/mole

**Chemistry**

It should be and Cpm = and 75.3 J/Kmol. I know w isn't anywhere in the problem which is why I don't know where to start.

**Chemistry**

At 298K and 1bar pressure, the density of water is 1.00 g/cm^3 , Cpm = and 75.3 J/Kmol. The change in volume with temperature is given by delta V = ViB(deltaT), where B, the coefficient of thermal expansion, is 2.07 * 10^-4 K^-1. If the temperature of 350g of water is increase...

**Math**

what are the zeros for 1x^5+2x^4+4x^3+19x^2+9x^2+9x-5?

**Social Studies**

Okay thankyou very much..

**Social Studies**

The key terms Patroon, Proprietary colony, and Pacifist are described in the history of Pennsylvania but checking for understanding. Does that mean they want me to copy ashort paragraph from the same Pennsylvania subject or write an example from my own life.???

**social studies**

Thankyou,,Thankyou,,,Thankyou!!

**social studies**

Patroon: land owner in the Dutch colonies who ruled like a king over large areas of land. Proprietary Colony: run by individuals or groups to whom land was granted. Pacifist: person opposed to the use of war or violence to settle disputes.

**social studies**

I need to write a short paragraph in which i use the following key terms: Patroon, Proprietary colony, Pacifist.

**us/101**

How would you determine the best way to communicate with each group?

**math**

1/2x(log)-log(1000)=3

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