# Posts by Brittany

Total # Posts: 951

**Math (Implicit Differention)**

it is x^(2/3)

**Math (Implicit Differention)**

((x^2)/3)+((y^2)/3)=4 d/dx 2x/3 + d/dx 2y/3 (y')= 0 y'= -(2x/3)-(2y/3) at the point (-1,3sqrt3) y'=(-2(-1)/3)-(2(3sqrt3)/3)=(2/3)-((6sqrt3)/3)=(2/3)-2sqrt3 Answer is (2/3)-2sqrt3 correct?

**Physical Science 8th grade**

A balloon filled with air does not rise as a balloon filled with helium. What does this tell you about the density of helium? A. Helium is more dense than air B. Helium is less dense than air C. The two gases have the same density D. When heated, helium becomes more dense

**statistics**

The human resources department of an engineering company gives IQ tests to a randomly selected group of new hires every year. They claimed that the mean IQ score of new hires, , from this year is greater than or equal to the mean IQ score of new hires, , from last year. This ...

**math**

The polynomial x 3 + 5x 2 -57x -189 expresses the volume, in cubic inches, of a shipping box, and the width is (x+3) in. If the width of the box is 15 in., what are the other two dimensions? ( Hint: The height is greater than the depth.)

**physics**

true

**Prevents**

If a book would cost 36 dollars and it had 10 percent of discount how much would the book cost after the discount

**geography**

Sammy is right omg wait cam is

**math**

If it takes a runner 15 minutes to run a mile how many miles would he run in two and half hours.

**math**

If it takes a runner 15 minutes to run a mile how many miles would he run in two and half hours?

**pre calculus**

a gun with a muzzle velocity of 1200 feet per second is fired at an angle of 6 degrees above the horizontal. find the component form of a vector. verify the magnitude

**math (check answer plz)**

answer is 2

**Math**

The quarterback of a football team releases a pass at a heights of 7 feet above the playing field, and the football is caught at a height of 4 feet, 30 yards directly downfield. The pass is released at an angle of 35 degrees with the horizontal. The parametric equations for ...

**Precalculus**

The quarterback of a football team releases a pass at a height of 7 feet above the playing field, and the football is caught at a height of 4 feet, 30 yards directly downfield. The pass is released at an angle of 35 degrees with the horizontal. The parametric equations for the...

**gg**

18000

**trig**

A plane is flying due south at a speed of 192 mph. a wind is blowing in at 53 degrees at 13 mph. what is the bearing of the plane?

**Math-Statistics**

Assume your expected lifetime income is $1.5 million and the standard deviation is $250,000. a) What is the chance that you will earn more than $1.1 million during your lifetime? b) What is the chance that you will earn less than $2 million during your lifetime? c) What is the...

**english**

Which synonym of the word look would be most effective in the following sentence? Detective Flint leaned forward with narrowed eyes to _______ what appeared to be a vital clue. A. survey B. scrutinize C. view D. ogle I think it's B.

**Science**

All them are wrong.. Just thought I would tell you

**geometry**

A person riding the original Ferris Wheel is traveling at a speed of 0.495 mph. If one revolution takes 9 minutes, what is the diameter of the Ferris Wheel? Show your work.

**health**

Drinking in moderation or not drinking at all will typically lead to? A. Weight gain B. Heart disease C. Weight loss D. High blood pressure

**Math**

XY= -25 what is the constant of variation for this relationship? a. 1/4 b. -25 c. -2.5 d. -0.4

**math**

A student has a penny, nickel, dime, and quarter distributed two coins apiece to his front two pants pockets. What is the probability that the front right pocket has more then 30 cents in it?

**math**

A truck drove 1400 miles at a rate twenty miles per hour slower on the return trip. If the trip took 22 hours total, how fast was the truck going on the return trip? Round your answer to the nearest hundredth.

**math**

Find the original price of a pair of shoes if the sale price is $56 after a 20% discount

**Personal Dimensions of Education**

are

**Math**

Thanks everyone

**Math**

SO ITS 20 PEOPLE?

**Math**

a restaurant charges a reservation fee of $15 for its party room, plus $21.50 per person. If the bill was $445, how many people were at the party? HELP PLEASE! IS THE ANSWER 30?

**Science**

is Ur Mom right?

**chemistry**

2. What is the percent yield of Mg3N2 if 73.9 g of Mg reacts with 31.6 g of N2 to produce 79 g of Mg3N2 according to the following chemical reaction? (Reaction may or may not be balanced.) mg+n2=Mg3N2

**Geometry**

Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length of wrought iron used to make the structure. Round the answer to the nearest meter. and there's a ...

**American Governent**

List and Explain three duties of members of the executive office of the president.

**math**

identify an integer x for which 2x/5 represents a ratio greater that 2:1 but less than 3:1 could 2.4 be a possible answer?

**math**

anyone...PLEASE!!!

**math**

I really need help with this problem! Thanks so much!

**math**

identify an integer x for which 2x/5 represents a ratio greater that 2:1 but less than 3:1

**Math**

In a AAA map of Ohio, 1 inch equals approximately 10 miles or 18 kilometers. If the distance on the map between Pauling and Eaton is 9.8 inches, how many kilometers is it between the two towns?

**chemistry**

n an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?

**geometry**

For 1 through 10, what is the area and volume of the given shape, if the length of one side of the base is 6, the height is 8, and the slant height is 10? (Not all shapes will require all three numbers.) The shape is a right prism with: 1. an equilateral triangle as the base

**prealgerbra & introductory algebra**

-22+y=y/-14

**Intermediate Algebra**

Thank you so much, I couldn't figure out what to multiply both sides with. Again this is an awesome website.

**Intermediate Algebra**

y/11=3

**Math**

a pharmacist found at the end of the day she had 7/4 as many prescriptions for antibiotics as tranquilizers. She had 66 prescriptions altogether. How many did she have for tranquilizers?

**AP Physics**

You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a droplet of oil spread out on a smooth water surface. The resulting oil slick will be approximately one molecule thick. Given an oil droplet of mass 10.00 multiplied by 10-7 kg ...

**math**

9x^4-x^2=0 step by step

**math**

Titus deposited $1,508.49 in a savings account that earns 4.2% simple interest. What will Titus's account balance be in 8 months?

**English**

If someone speaks candidly, she is most likely speaking ; ~honestly ~quietly ~sarcastically

**English**

Which of the following was not a popular genre during the Victorian era; detective fiction, gothic fiction or postmodern fiction?

**composition 1**

How do I start a good readers response?

**calculus**

how would you solve a problem like this for X: (1/3=(3^2x+2)

**Chemistry**

In the following reaction, how many grams of ferrous sulfide will produce 0.56 grams of iron oxide? 4FeS+7O2->2Fe2O3+4SO2 The molar mass of ferrous sulfide is 87.92 grams and that of iron oxide is 159.7

**Physics**

An object whose mass is unknown is held by two rigid rods. The whole system is at rest. The angle between the vertical direction and the left rod from point A to B is 60 degrees. The angle between the vertical direction and the right rod from point C to D is 30 degrees. The ...

**PHYSICS**

Two cars lost in a blinding snowstorm are traveling across a large field, each thinking they are on the road, as shown in the figure on the left. They collide. If the distance x is 150 meters and the red car is travelling at 19.1 mph, how fast to the nearest hundredth of a mph...

**Physics**

A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm. Two point sources of ...

**Algebra 2**

The functions f(θ) and g(θ) are sine functions, where f(0) = g(0) = 0. The amplitude of f(θ) is twice the amplitude of g(θ). The period of f(θ) is one-half the period of g(θ). If g(θ) has a period of 2pi and f (pi/4) = 4, write the function ...

**World Geography**

BleSS BObby

**Algebra**

Square root 18 + (3/square root 2)

**Algebra**

Square root 18 + 3/square root 2

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after ...

**algebra 1**

*I have asked countless people to help me with this story problem and nobody seems to know how to do it! Please help! Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C ...

**algebra 1**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...

**Math**

For a seesaw that 14 ft long, where should the fulcrum be placed to balance a 204 lbs adult and a 81.6 lbs child?

**math**

A 4inch-thick concrete slab is being poured for a circular patio 14 feet in diameter. Concrete costs $55 per cubic yard. Find the cost of the concrete, to the nearest cent.

**English**

An international agreement that aims to reduce carbon dioxide emissions and the presence of greenhouse gases. Countries that ratify the Kyoto Protocol are assigned maximum carbon emission levels and can participate in carbon credit trading. Emitting more than the assigned ...

**Algebra**

Matt ate a total of 100 raisins over a five day period. Each day he ate six more raisins than the previous day. How many did he eat the first day?

**Algebra**

Three ships leave New York for France on the same day. The round trip takes the first ship 12 days, the second ship 16 days and the third ship 20 days. How many days will elapse before all three ships again leave New York on the same day? Assume continuous trip activities for ...

**statistics**

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2. If the variable is normally distributed, what is the probability that a randomly selected town will have a homicide rate greater than 14?

**Physical science**

Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate? A.increasing water temperature B.decreasing water temperature C.using more water

**physical science**

A. increasing water temperature B decreasing water temperature C.using more water

**physical science**

Help please. Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?

**Algebra**

75

**chemistry**

a 225.0 g sample of an unknown, silver, pure metal was heated to 95.5 degrees celsius then put into 150.50 g of water at 22.5 degrees celsius. the water was heated by the hot metal to a temperature of 31.4 degrees celsius. what is the specific heat? what is the metal?

**chemistry**

thank you , but what do I substitute the specific heat metal for to find out what it is?

**chemistry**

a 225.0g sample of an unknown, silver, pure metal was heated to 95.5 degrees Celsius and then put into 150.50g of water at 22.5 degree Celsius. the water was heated by the hot metal to a temp. of 31.4 degree Celsius. what is the specific heat of the metal and what is the metal?

**chemistry**

what mass of a sample of gold requires 1.75 kJ to change its temperature from 28.2 degrees Celsius to 89.5 degrees Celsius?

**math**

in a triangle, the measure of the first angle is twice the measure of the second.the measure of a third triangle is 64 degrees more than athe measure of the second angle. Use the facts that the sum of the measures of the three angles of a triangle is 180 degrees to find the ...

**Math**

What is the value of x x/60 = 1/2/1/6

**Math**

An architect is drawing a scale model of a new mall. The real mall will be 1800 feet long. The scale the architect is using is 1 inch is equal to 100 feet. How long will the model be?

**Math**

A ladder has a shadow 3.5 meters long. Marlowe’s shadow is .75 meters long. If Marlowe is 1.5 meters tall, how tall is the ladder?

**Math**

A pole has a shadow that is 5 feet long. Jackie's shadow is 3 feet long, and she is 6 feet tall. How tall is the pole?

**Math**

A pole has a shadow that is 5 feet long. Jackie's shadow is 3 feet long, and she is 6 feet tall. How tall is the ladder?

**Chemistry**

How much heat (kcal)is needed to melt 14 ice cubes? Each cube is at 0c and has a mass of 28grams.

**trig**

10sinB+5 = sinB+5

**chemistry**

At 0*C a 1.0-L flask contains 5.0 x 10^-2 mol N2, 1.5 x 10^2 mg O2, and 5.0 x 10^21 molecules of NH3. What is the partial pressure of each gas, and what is the total pressure in the flask?

**Physics**

a 0.67 kg rubber ball has a speed of 2.2 m/s at point a and kinetic energy 7.1 J at point B find the total work done on the ball as it moves from a to b

**Physics**

a 0.67 kg rubber ball has a speed of 2.2 m/s at point a and kinetic energy 7.1 J at point B find the total work done on the ball as it moves from a to b

**Physics**

A current of 4.6 A is measured through a 7.8 ohms resistor for 1.75 minutes. How much heat is generated by the resistor?

**Physics**

A current of 4.6 A is measured through a 7.8 ohms resistor for 1.75 minutes. How much heat is generated by the resistor?

**math**

A marathon runner ran the first 5 mi. in 32.5 min. If she continues running at this pace, how long will it take her to run the entire marathon of 26.2 mi?

**math**

A factory produces bicycles 6 motorcycles in 9 hours. Write a proportion and solve it to find how many hours it takes to produce 16 motorcycles

**Math**

A basketball star earned $2,000,000 last year. He played in 64 games for an average of 42 minutes per game. Find these rates dollars per game dollars per minute of playing time

**Math**

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates. gallons per mile

**Math**

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates

**Statistics**

If student A scored 42 on a test of reading and the test had a mean of 52 and a standard deviation of 8, what percentage of test respondents scored below student A?

**Math page 167 algebra did you hear about...**

-1,-2

**Biostats**

If the average (xbar) on an assignment in a class was 82% with a standard deviation (s) of 4.8, what is the z-score for someone scoring 75% (round to the one hundredths place or two decimal places)?

**Physics**

If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy

**Chemistry.**

Thank you so much! The 151 was the wavelength notation.