Friday

October 24, 2014

October 24, 2014

Total # Posts: 762

**college algebra**

Let f(x) = x + 2 and g(x) = x2 − 2. Determine the domain of the composite function.
*October 21, 2013*

**college algebra**

Thank you so much.
*October 21, 2013*

**college algebra**

what is the domain of (square root of x) +7?
*October 21, 2013*

**college algebra**

Thank you Steve, that was a big help.
*October 14, 2013*

**college algebra**

the following rational function gives the number of days it would take two construction crews, working together, to frame a house that crew 1 (working alone)could complete in t days and crew 2 (working alone) could complete in t+3 days. f(t)=(t^2+3t)/(2t+3). (a) if crew 1 ...
*October 14, 2013*

**college algebra**

Need help in finding all vertical, horizontal, and slant asymptotes, x- and y-intercepts, and symmetries of f(x)=(x-3)/(x-4)
*October 9, 2013*

**Chemistry**

What is the relationship of the concentration of H3O and of OH
*October 9, 2013*

**social studies**

men from higher social classes in------ cultures tend to have low levels of conformity, more self-direction, and have greater intellectual flexibility than did men from lower social classes A) collectivist B) individualist C) interdependent D) all My choice is C but Im a ...
*October 4, 2013*

**physics**

a 100g mass of cookie dough hits inelastically with a 300g mass of cookie dough and they stick. the 100 g mass was moving to the right at 40 m/s and the 300g mas was moving to the left at 5 m/s. what is the final velocity of the massive cookie dough ball? what fraction of ...
*October 3, 2013*

**social studies**

thank you very much!
*September 29, 2013*

**social studies**

I am guessing this one, because I can't find the answer on my book. Would it be D.
*September 29, 2013*

**social studies**

people in countries with tend to be happier A) high incomes B) low incomes C) more civil liberties D) high incomes and more civil liberties My answer is B.
*September 29, 2013*

**social studies**

daydreaming can be an expression of: A) repression B) denial C) sublimation D) projection My answer is D
*September 29, 2013*

**social studies**

thank you for the eye opener:)
*September 29, 2013*

**social studies**

then the answer is B, because personality its not heritable and def. not C
*September 29, 2013*

**social studies**

all personality variables are: A) highly heritable B) unconscious C) theoretical constructs D) easily assessed with questionnaries My asnwer is D
*September 29, 2013*

**aed**

thank you
*September 20, 2013*

**aed**

I need an answer
*September 20, 2013*

**aed**

determine the potential impact of socioeconomic status on education in the following areas: teacher expectatations, student tracking, equal representation in the curriculum, and financial support for schools
*September 20, 2013*

**math**

a rectangular swimming pool 20 feet long and 10 feet wide,is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?
*September 19, 2013*

**math**

a rectangular swimming pool 20 feet long and 10 feet wide,is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?
*September 19, 2013*

**Algebra**

Express the relationship 20 < C < 30 in terms of F, where F = 9/5C + 32. _____________ < F < _____________
*September 17, 2013*

**Algebra**

the cost of renting a rototiller is $16.50 for the first hour and $10.95 for each additional hour. How long can a person have the rototiller if the cost must be less than $55.00?
*September 17, 2013*

**algebra**

a student write that an=3n+1 is a explicit formula for the sequence 1,4,7,10.explain the error and write the correct explicit formula for the sequence.
*September 11, 2013*

**college algebra**

The county news earns a profit of $20 per year for each of its 3000 subscribers. Management projects that the profit per subscriber would increase by $0.01 for each additional subscriber over the current 3,000. How many subscribers are needed to bring a total profit of $113,100?
*September 10, 2013*

**college algebra**

no, I copied the question just as it is, there is 2 answers, the $10,000 is the smaller amount he invested, there should also be a larger amount.
*September 10, 2013*

**college algebra**

Scott and Laura have both invested some money. Scott invested $2500 more than Laura and at a 3% higher interest rate. If Scott received $900 annual interest and Laura received $450, how much did Scott invest?
*September 10, 2013*

**college algebra**

a large rectangular movie screen in an IMAX theater has an area of 8624 square feet. Find the dimensions of the screen if it is 10 feet longer than it is wide.
*September 8, 2013*

**CHEM**

joules to melt a 525g ice cube at 0∘C and to warm the liquid
*September 8, 2013*

**Algebra**

Kevin stuffs shrimp in his job as a seafood chef. He can stuff 1200 shrimp in 4 hours. When his sister helps him, they can stuff 1200 shrimp in 3 hours. If kevin gets sick, how long will it take his sister to stuff 600 shrimp?
*September 5, 2013*

**Algebra**

Allison drove home at 68 mph but her brother who left at the same time could only drive at 54 mph. When Allison arived, her brother still had 84 miles to go. How far did Allison drive?
*September 5, 2013*

**business**

would it B be the best answer?
*August 27, 2013*

**business**

Select the statement which reflects the employer position on electric monitoring. a.) An employee's actions during work time are at the discretion of the Company. b.) Employees should be notified of any electronic monitoring and its purpose. c.)Electronic monitoring ...
*August 27, 2013*

**business**

A manager refuses to reveal company secrets despite an offer of handsome kickbacks. Which of the following reasons justifies her action if she were to subscribe to Kohlberg’s preconventional level of moral reasoning? A- An idea of the unpleasant emotions she would feel if...
*August 27, 2013*

**Physics **

a cylinder of gas is at a room temp (20 c) the air conditioner breaks down and the tempture rises to 58c what is the new pressure of the gas relative to its initial pressure?
*July 30, 2013*

**maths**

find a single discount equivalent to the discount series 20%, 10%, and 15%.
*June 29, 2013*

**Stats**

1. In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1-10. The data appear below. Number of Cups of Coffee Stress Level 3 5 2 3 4 3 6 9 5 4 1 2 7 10 3 5 = 3.88 X= 5.13 s = 2.03 s = 2.90 ...
*June 22, 2013*

**math**

a rectangle has a length of 10 3/16 inches and a width of 6 7/8 inches. nwhat is the perimeter of the rectangle
*May 29, 2013*

**algebra**

Need help with 3 problems on page 167 X+2y=6 5x+3y=2 4x-3y=-20 -x-8y=5 5x+6y=-11 3x+y=-4
*May 14, 2013*

**Geometry**

A landowner digs a 15 meter deep well with a diameter of 2.8 meters. The landowner spreads the dirt dug out of the holds to form a flat platform 31.5 meters by 6 meters. What is the length of the platform?
*May 1, 2013*

**Geometry**

An unsharpened pencil is in the shape of a hexagonal prism, in which the face edge is 4 millimeters and the length is 170 millimeters. What is the lateral area of the pencil?
*May 1, 2013*

**Chemistry**

Use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. I absolutely have no idea what to do, please help me!
*April 30, 2013*

**Chemistry**

Oh I see what I did wrong! Thanks!
*April 30, 2013*

**Chemistry**

i got -1,279.89 and still got it wrong..doing the same calculations just fixing the 468.25 where it belongs
*April 30, 2013*

**Chemistry**

For a particular reaction at 195.1 °C, ΔG = -1488.09 kJ/mol, and ΔS = 288.67 J/(mol·K).? Calculate ΔG for this reaction at -20.0 °C. delta G = delta H - (T*delta S) -1488.09 kJ/mol = (delta H) - ((461.8K)*(+288.67 J/(mol x K))*(1 kJ/1000 J)) -1488...
*April 30, 2013*

**geometry**

Find the weight to the nearest kg, of the cement block. Cement weighs 1700 kg/m3. 12cm x 10cm and 40cm x 20 cm x 20cm.
*April 20, 2013*

**statistics**

It takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1,424 discharges for the month?
*April 15, 2013*

**Chemistry**

So i got Ka = X^2/(0.184-x) not sure what to do next.
*April 11, 2013*

**Chemistry**

The Ka of a monoprotic weak acid is 4.47 × 10-3. What is the percent ionization of a 0.184 M solution of this acid?
*April 11, 2013*

**physics**

A solid steel cylinder is standing (on one of its ends) vertically on the floor. The length of the cylinder is 3.4 m and its radius is 58 cm. When an object is placed on top of the cylinder, the cylinder compresses by an amount of 5.9 10-7 m. What is the weight of the object?
*April 3, 2013*

**physics**

A copper cube, 0.31 m on a side, is subjected to two shearing forces, each which has a magnitude F = 6.40 106 N (see the drawing). Find the angle θ (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.
*April 3, 2013*

**Cal**

Find the critical number of the function. g(t) = | 4t - 9 |
*April 3, 2013*

**Chemistry**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.100 M and [NO]=0.500 M. The balanced chemical equation is N2+O2<--->2NO. If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after ...
*April 2, 2013*

**Chemistry**

If a 4.30 M sample of A is heated to 500 K, what is the concentration of B at equilibrium? A(aq) --><--- 2B(aq) Kc=8.54 x 10^-6 at 500K ---><--- = equilibrium
*April 2, 2013*

**Chemistry**

At a certain temperature, the Kp for the decomposition of H2S is 0.755 H2S (g) <-- --> H2 (g) + S (g) Initially, only H2S is present at a pressue of 0.201 atm in a closed container. what is the total pressure in the container at equilibrium?
*April 2, 2013*

**Chemistry**

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) ⇌ PCl3(g) + Cl2(g) A 0.304 mol sample of PCl5(g) is injected into an empty 4.75 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
*April 2, 2013*

**Chemistry**

At a certain temperature, the equilibrium constant for the following chemical equation is 2.00. At this temperature, calculate the number of moles of NO2(g) that must be added to 2.64 mol of SO2(g) in order to form 1.10 mol of SO3(g) at equilibrium. SO2(g) + NO2(g) <--->...
*April 2, 2013*

**Physics**

The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x coordinate and (b) the y coordinate of the center of...
*April 1, 2013*

**Cal**

lim_(x->0^+)(tan(9x))^x
*March 27, 2013*

**chemistry**

How many grams are in 4.00mol of sodium chloride (\rm NaCl)
*March 24, 2013*

**Science**

How does the number of neutrons in a stable nucleus compare with the number of protons?
*March 22, 2013*

**Science**

If the half-life of a radionuclide is 1 month, is a sample of it completely decayed after 2 months?
*March 22, 2013*

**physical science**

What physical quantities are governed by the quantum numbers of an atomic electron?.
*March 22, 2013*

**Physics**

A half-atwood machine is constructed, as shown in the drawing below. The table is NOT frictionless, M1 is 50 grams, and M2 is 30 grams. Mass M2 descends 32 cm in 18 seconds. Find the tension in the wire.
*March 21, 2013*

**phical science**

Photons and neutrinos have neither charge nor mass. What are the differences between them?
*March 18, 2013*

**Cal**

Differentiate the function. f(x) = sin(x) ln(2x)
*March 14, 2013*

**math**

nevermind, all figured out. thanks!
*March 11, 2013*

**math**

oops, yes carrot cakes...typed too fast. still dont understand, can you explain it better for me please?
*March 11, 2013*

**math**

castor brought 6 3/4 carat cakes to share with 26 students. did castor bring enough for each student to have 1/4 of cake?
*March 11, 2013*

**Cal 1**

Use Newton's method with the specified initial approximation x1 to find x3, the third approximation to the root of the given equation. (Round your answer to four decimal places.) 1/3x^3 + 1/2x^2 + 1 = 0, x_1 = −3
*March 7, 2013*

**Cal 1**

Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answer to two decimal places.) tan x ≈ x
*March 7, 2013*

**Cal 1**

Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.) (1 + 2x)^1/4 ≈ 1 + 1/2x
*March 7, 2013*

**Cal 1**

Find the linearization L(x) of the function at a. f(x) = x^4/5, a = 32
*March 7, 2013*

**Physics**

A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
*March 6, 2013*

**Physics**

A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
*March 6, 2013*

**Physics**

A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
*March 6, 2013*

**Physics**

A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
*March 6, 2013*

**Physics**

A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
*March 6, 2013*

**Physics**

A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3.8E3 J. What is his weight?
*March 6, 2013*

**Physics**

A ladder (L = 7.80 m) of weight WL = 360 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose weight is ...
*March 4, 2013*

**Physics**

Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is...
*March 4, 2013*

**chemistry**

wait is it 79.57g?
*March 2, 2013*

**chemistry**

delta t = i*Kf*m m = mols/kg solvent 4= (3)(1.86) m= 0.717 (0.717)(1000) = 0.000717mol 0.000717mol/110.98g/mol = 6.46 x 10^-6g
*March 2, 2013*

**chemistry**

is the answer 0.079g or 0.00000646g ? I'm not sure if I've done it correctly.
*March 2, 2013*

**chemistry**

If Kf = 1.86C/m, how many grams of calcium chloride must be added to 1.0L of water (assume a density of 1.0 g/mL) to lower the freezing point 4.0 C?
*March 2, 2013*

**Chemistry**

Imagine two solutions with the same concentration and the same boiling point.? Imagine two solutions with the same concentration and the same boiling point, but one has ethanol as the solvent and the other has carbon tetrachloride as the solvent. Determine that concentration ...
*March 2, 2013*

**Chemistry**

A solution is made by mixing 37.0 mL of ethanol, C2H6O, and 63.0 mL of water.? Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C? ethanol: 0.789 g/mL 43.9 torr water : 0.998 g/mL 17.5 torr
*March 2, 2013*

**Math**

Find the number of each kind of object in the collection Miranda has 24 CDs in her collection. Of those CDs, 10 are pop CDs. She has 6 more country CDs than jazz CDs. How many country CDs does Miranda have?
*March 1, 2013*

**physics**

Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is...
*February 28, 2013*

**physics**

A kite is hovering over the ground at the end of a straight 47-m line. The tension in the line has a magnitude of 14 N. Wind blowing on the kite exerts a force of 17 N, directed 55° above the horizontal. Note that the line attached to the kite is not oriented at an angle ...
*February 28, 2013*

**Chemistry**

The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of acetone in the solution? Show work. A) 0.69 B) 0.32 C) 0.13 D) 0.045 E) 0.87
*February 27, 2013*

**Chemistry**

Isoamyl salicylate (м = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)
*February 27, 2013*

**math**

500000
*February 25, 2013*

**Chemistry**

Explain how you would prepare 100.0 mL of 0.500 M NaCl solution. Include the appropriate glassware and calculations.
*February 25, 2013*

**math**

A two digit number has the property that the units digit is 4 less than the tens digit and the tens digit is twice the units digit. What is the number?
*February 18, 2013*

**Physics**

A model rocket launches with an initial velocity of 6 m/s, at an angle of 90 degrees (with respect to the horizon). The rocket's engine provides an acceleration of 2.2 m/s2, acting in the same direction as the initial velocity. After 20 seconds, the rocket engine cuts out...
*February 15, 2013*

**physics**

A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The...
*February 12, 2013*

**physics**

The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force SM that the sun exerts on the moon is perpendicular to the force EM that the earth exerts on the moon. The masses are: mass of sun = 1.99 1030 kg, mass of earth = 5.98 1024 kg, ...
*February 7, 2013*

**physics**

The weight of an object is the same on two different planets. The mass of planet A is only forty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.
*February 7, 2013*

**physics**

A rocket of mass 4.5 105 kg is in flight. Its thrust is directed at an angle of 45.5° above the horizontal and has a magnitude of 7.60 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizonal.
*February 7, 2013*

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