# Posts by justin

Total # Posts: 946

**Calculus**

Find y" by implicit differentiation. x^3+y^3 = 1 (x^3)'+(y^3)' = (1)' 3x^2+3y^2(y') = 0 3y^2(y') = -3x^2 y' = -3x^2/3y^2 y' = -x^2/y^2 y" = [(y^2)(-x^2)'-(-x^2)(y^2)']/y^4 y" = [(y^2)(-2x)-(-x^2)(2y)]/y^4 y" = [(-2xy^2...

**Calculus**

y" = (2x+4)(-1.5(x+1)^-2.5) + (x+1)^-1.5(2) y" = (x+1)^-1.5[2+(2x+4)(-3/2(x+1))] y" = (x+1)^-1.5[2+(-6(x+1)/2(x+1))] y" = (x+1)^-1.5[2+(-3)] y" = -(x+1)^-1.5 Also, thank you for your time!!

**Calculus**

Just got through with derivatives, power rule, and chain rule. I am supposed to find the first and second derivatives of the function. y = 4x/√x+1 and y = cos^2(x) y' = [(x+1)^(1/2)(4)]-[(4x)(1/2(x+1)^(-1/2))(1)] y' = [4(x+1)^(1/2)-4x]/[2(x+1)^(1/2)(x+1)] y'...

**Calculus**

We just learned derivatives and now on the Chain Rule. y = r/[(sqrt)(r(sqrd)+1)] y' = [[(sqrt)(r(sqrd)+1)(r)'] - [(r)(sqrt)(r(sqrd)+1)']] / [(sqrt)(r(sqrd)+1)](sqrd) y' = (sqrt)(r(sqrd)+1) - r[1/2(r(sqrd)+1)(raised to -1/2)](2r) My final answer is -3r/[2(sqrt)(...

**physics**

A rocket is fired at an angle from the top of a tower of height h0 = 65.5 m . Because of the design of the engines, its position coordinates are of the form x(t)=A+Bt2 and y(t)=C+Dt3, where A, B, C , and D are constants. Furthermore, the acceleration of the rocket 1.50 s after...

**Math**

3 because 9/3 is 3

**Math**

What is the square root of 9? 9/3 3 so 3 is the square root of 9

**calculus**

a particle starts from rest and moves along a straight line with an acceleration equal to 24-15√t where distance and time are measured in terms of feet and seconds respectively. with what acceleration will the particle return to the starting point?

**calculus**

find the equation of the curve for which y''=(12/x^3) if it passes through (1,0) and is tangent to the line 6x+y=6 at that point.

**calculus**

find the equation of a curve for which y''=6x-6 if the curve has a critical point at (2,1).

**calculus**

find the equation of the curve for which y''=6x-4 and which passes through (1,2) and (-2,5).

**calculus**

find the equation of the curve for which y'=3x^2 and which passes through (1,-1)

**calculus**

Find the equation of the curve for which y''=6x-4 and which passes through (1,2) and (-2,5). thank you :-)

**calculus**

Find the equation of the curve for which y'=3x² and which passes through (1,-1).

**calculus**

If dy=(2x+1)dx and y=7 when x=1, find the value of y when x=3.

**math algebra**

At your local bar, chicken wings cost $0.30 a piece on Thursday night. Sriacha Ranch dressing (enough for 10 wings), cost $0.10 per serving. A pitcher of of ice tea cost $7.50 and a serving of celery cost $2.50 . Tax in your part of LA County is 8.5% and the standard tip rate ...

**Math**

a woman drives to work and averages 70 kilometers per hour for the trip. On her trip from work to home she averages 100 kilometers per hour. What is her average speed for the round trip?

**Algebra**

Problem solving (point of intersection) You are considering changing your cell phone plan . Company A offered a flat fee of $40 plus 10cents for each additional min of use. Company B offers a monthly flat fee of $20 plus 15 cents for each additional min of use. What plan would...

**Problem solving (point of intersection)**

You are considering changing your cell phone plan . Company A offered a flat fee of $40 plus 10cents for each additional min of use. Company B offers a monthly flat fee of $20 plus 15 cents for each additional min of use. What plan would you choose? Equation : y=. x+ Equation...

**Problem solving (point of intersection)**

Alpine Valley charges $10/hr for lessons and $40 for the lift ticket and snowboard rental. Chicopee Hills charges $20/hr which includes lessons, lift ticket and rentals. Which resort would you choose? Equation A: y=. X+ Equation B: y=. X+ Decide on a reasonable starting point ...

**statistics**

A simple random sample of 1350 registered voters shows that 58% favor Candidate A over Candidate B. Construct a 99% confidence interval for the percent of the population of all registered voters who prefer Candidate A over Candidate B.

**trig**

Find the values of sin 0, cos 0, and tan 0ƒáif the angle 0ƒáis in standard position and its terminal side passes through the point (¡V15, 8). Give answers as fractions.

**physical science**

What is the amplitude of a longitudinal wave

**M ath**

Thank you, Yes I can do B from here.

**M ath**

Sally has a sum of $26000 that she invests at 9% compounded monthly. What equal monthly payments can she receive over a period of a) 9 years? b) 7 years?

**english**

Using a single formatting _____ helps to make reading researched information easier;it lets the reader know what to expect. A. Citation B. Text C. Style D. Website My answer was b it was wrong so I'm thinking the answer is c

**English**

To use another's ideas in your own words is to ___ those ideas. A. Paraphrase B. establish C. Manifest D. Refute My answer was b I got it wrong so would the answer be A

**English**

No B

**English**

Would the answer be A

**English**

Which of the following would most likely be an entry in a sentence outline? A. Education tool B. Education can change a person's life C. Education as a pathway D. Education beyond high school versus education beyond college My answer was D I got it wrong Would it be a

**math**

3/8

**Physics**

A body of mass m is suspended from a spring with spring constant k and the spring is stretched 0.1. If two identical bodies of mass m/2 are suspended from a spring with the same spring constant k, how much will the spring stretch? Explain your answer. The first case is when ...

**physics for physical science**

A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.

**algebra**

The sum of two numbers is 70. One number is 10 more than twice the other number. Using Elimination find the numbers.

**Physics**

Two men of the same mass climb the same flight of stairs. The first man climbs the stairs for 25 seconds, while the seconds person takes 35 seconds. Which man does the most work?

**English**

Five sentence paragraph. To make a perfect turkey sandwich you will need, butter knife, turkey, cheese,mayo, lettuce, tomato and two slices of bread. Next, place the mayo evenly on both side of the bread. On one slice of the bread place the cheese,turkey,lettuce,and tomato. ...

**Physics**

A bike and cyclist have a combined mass of 75 kg. If the brakes can apply a maximum force of 20 N, what is the shortest time in which the cyclist can stop?

**IPC**

A hailstone traveling with a velocity of 43 meters/second comes to a virtual stop 0.28 seconds after hitting water. What is the magnitude of its acceleration in the water? a. 12 meters/second2 b. 1.5 × 102 meters/second2 c. 78.6 meters/second2 d. 6.5 × 10-3 meters/...

**maths**

-2(2x-5)(3x+1)

**math**

68/21

**math**

what is the total cost for 4 1/10 pounds of vanilla pudding? vanilla pudding=$7/lb

**physics**

The small piston of a hydraulic lift has a cross-sectional area of 3.6 cm2 and the large piston has an area of 86 cm2. What force F must be applied to the small piston to maintain the load of 52 kN at a constant elevation?

**Algebra**

1.33

**Math**

You own 80 mp3s. You plan to add 10 more songs every month. Represent this relationship to show how many mp3s you have for th nxt six months. What is the independent x varible?

**Physics**

.022

**Astronomy**

A simple temperature model for the solar nebula disk is ￼Tdisk(a) = 20 � SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. ￼(a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is...

**Science Physics**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-

**Specific Heat**

Forgot to add specific heat for copper is 0.092

**Specific Heat**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F

**Science Physics**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F

**Physics (heat)**

A coal sample yields 1.25 X 10^4 Btu/lb. How many foot-pounds of work result from burning 1.00 ton of this coal?

**Science Physics**

600/9800

**Science Physics**

A lifeguard swims with her head just above the water. What is the volume of the submerged part of her body if she weighs 600 N? Would I need to divide by 9800 or 62.4?

**Science Physics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?

**physics**

Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it with this speed? If Bob ...

**Fluid Mechanics Physics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?

**Hydraulic Physics**

thank you

**Hydraulic Physics**

So it would be 50.0/25.0*20.0=40

**Hydraulic Physics**

In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2? Would I need to divide both pistons areas then mutiply the force? and or have gravity in ...

**Fluid Mechanics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?

**Fluid Mechanics**

In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2?

**MATH (PROBABILITY)**

According to Nielsen Media Research, approximately 52% of all U.S. households have digital cable television. In addition, 84% of all U.S. households have multiple TV sets. Suppose 45% of all U.S. households have digital cable television and have multiple TV sets. A U.S. ...

**Chem 30 Thermodynamics**

Your friend comes across a good deal to purchase a gold ring. She asks you for advice for you to test the ring. The ring has a mass of 4.54 g. When you heat the ring with 94.8 J of energy, its temperature rises from 23.0 degrees celsius to 47.5 degrees celsius. Would you ...

**physics**

Suppose that 1100 j of work is done by the force 30 n in moving the suitcase a distance of 50 m. At what angle is the force oriented with respect to the ground?

**Physics (Force)**

A power wheelbarrow has a mass of 432 kg. What force must be applied to give it an acceleration of 1.75 m/s2?

**FRACTION CONCEPTS**

I am a fraction whose numerator and denominator are both prime numbers less than 20. if you were to increase each term by 1, I would be equivalent to 1/2. what fraction am I?

**Physics**

A relativistic proton has a momentum of 1.0×10^-17 kg ∙ m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mass of proton = 1.67 × 10-27 kg)

**Physics**

Assume that a certain city consumes electrical energy at an average rate of 2.0× 10^9 W. What would be the mass change in producing enough energy to keep this city running for 21 weeks?

**math/stats**

What is the standard deviation of a $1 bet on any one particular number, e.g., 33, in the game of American roulette? Notice the payoff is 35:1 for this type of bet.

**statistics**

What is the standard deviation of a $1 bet on any one particular number, e.g., 33, in the game of American roulette? Notice the payoff is 35:1 for this type of bet.

**history**

Buffalo

**physics**

how long does it take an car travailing in the left lane of a highway at 60km/h to overtake another car in the right lane traveling at 40km/hr when the cars start 100meters apart

**geometry**

one side of a parallelogram has endpoints (2,1) and (3,5) The endpoints for the opposite side are (5,2) and (6,6) true or false

**Biology**

can you please help me with number 19. the question is The function of the magnified structure shown in the image below is ___________ exchange.

**AP chemistry**

42.1 degrees celsius

**Math**

Ms. Sue forgot to grasp the concept of this being algebra not 1st grade math. I'll save you the time. It's 3.43.

**geography**

what is the value of igneous rocks to humankind?

**math**

The garage you work for as an auto mechanic measures 230 ft. by 150 ft and handles 69 cars. Using the existing garage as a model, how much space would you plan to have in your garage?

**math**

You require space to service 65 vehicles at any one time. Will a facility measuring 145 ft. by 130 ft. be adequate if each vehicle requires 300 sq.ft.?

**math**

Hal Fritz purchased a $5,000 bond at 95. The annual interest is 6%.What was the cost of the bond? What was the annual interest? What is the yield (to nearest tenth of a percent)? please help

**Chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ?E is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...

**math**

Thanks :)

**math**

So it's 40%?

**math**

What % of $3.75 is $1.50?

**math**

Brendan got 31 questions correct on his social studies test and missed 9 questions. What percent did he have correct?

**math**

If Sue worked 6 3/4 hours on Monday, 4 hours on Tuesday, 7 3/4 hours on Wednesday, 8 hours on Thursday, and 5 1/2 hours on Friday, calculate her weekly wage at $7.20 per hour.

**math**

Frank owns 300 acres of land. If he divides the land into 1/2 acre plots, how many plots will he have?

**chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ΔE is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...

**chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ΔE is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...

**math**

.An angle is 10° more than the measure of its complement. Find the number of degrees in each angle.The angles measure _ degrees.

**math**

An alloy of copper is 10% copper and weighs 25 pounds. A second alloy is 18% copper. How much (to the nearest tenth lb.) of the second alloy must be added to the first alloy to get a 13% mixture.

**math**

Two angles are complementary. One contains 30° more than the other. Find both angles. The measures of the angles are _ degrees

**math**

If the angle of declination is known, a surveyor would use_______ to find the length x. The cosine of a 50° angle is_______ this represents the value created when length x is divided by 90 feet. If the angle of declination changed to 60°, the cosine would be 0.5; now ...

**math**

The Smiths want to buy a 9 ft. by 12 ft. carpet and center it in a 15 ft. by 20 ft. room. Can a 3 1/2 foot by 12 foot couch be placed against one of the long walls of the room without touching the carpet?

**Chemistry**

please help me balance these equations using the method of half reactions.. Na + HCL = NaCl + H2 Pb + PbO2 + H2SO4 = PbSO4 +H2O Thank you, even a little help is appreciated.

**Biology**

Exogenous treatment with the plant hormone, ABA or auxin, induces enhanced susceptibility against biotrophic pathogens. Design an experiment that can reveal whether these hormones use the same signalling pathway or independent pathways to induce susceptibility.

**English**

In "Paul's Case," members of the faculty don't like Paul's carnation because they think A. it doesn't match his other clothing. B. it suggests that he's not taking things seriously. C. it's the mark of an early death. D. it's effeminate ...

**physics**

A)A model rocket is launched straight upward with an initial speed of 47.7 m/s. It accelerates with a constant upward acceleration of 2.02 m/s2 until its engines stop at an altitude of 157 m. What is the maximum height reached by the rocket? B)How long after lift off does the ...

**economics**

you find out that your aunt works for a defense manufacturing company that has several defense contracts with the government. she tells you that she works for a team that is producing a communications satelluite