# Posts by brian

Total # Posts: 761

**Chemistry 12**

The following data was obtained after 25.00ml of benzoic acid was titrated with potassium hydroxide. Volume of KOH used: Trial 1: 27.80ml Trial 2: 27.88ml Trial 3: 27.66ml Initial pH: 3.125 pH at 13.92ml: 5.013 Find the Ka for this sample of citric acid and the concentration ...

**math/statistics**

In a survey of 200 employees of a company regarding their 401(k) investments, the following data were obtained. 150 had investments in stock funds. 78 had investments in bond funds. 60 had investments in money market funds. 46 had investments in stock funds and bond funds. 38 ...

**math/statistics**

In the Numbers Game, a state lottery, four numbers are drawn with replacement from an urn containing balls numbered 0-9, inclusive. Find the probability that a ticket holder has the indicated winning ticket. The first three digits in exact order.

**math/statistics**

In a survey of 400 individual investors regarding subscriptions to the New York Times (NYT), Wall Street Journal (WSJ), and USA Today (UST), the following data were obtained. 120 subscribe to the NYT. 146 subscribe to the WSJ. 68 subscribe to the UST. 36 subscribe to the NYT ...

**math**

Solve the linear programming problem by the method of corners. Find the minimum and maximum of P = 3x + 2y subject to 3x + 5y ? 20 3x + y ? 16 ?2x + y ? 2 x ? 0, y ? 0 The minimum is P = at (x, y) =

**math**

A company manufactures x units of Product A and y units of Product B, on two machines, I and II. It has been determined that the company will realize a profit of $2/unit of Product A and a profit of $7/unit of Product B. To manufacture a unit of Product A requires 6 min on ...

**math**

A financier plans to invest up to $500,000 in two projects. Project A yields a return of 8% on the investment of x dollars, whereas Project B yields a return of 13% on the investment of y dollars. Because the investment in Project B is riskier than the investment in Project A...

**math**

Solve the linear programming problem by the method of corners. Find the minimum and maximum of P = 3x + 2y subject to 3x + 5y ? 20 3x + y ? 16 ?2x + y ? 2 x ? 0, y ? 0 The minimum is P = at (x, y) =

**math**

A financier plans to invest up to $500,000 in two projects. Project A yields a return of 8% on the investment of x dollars, whereas Project B yields a return of 13% on the investment of y dollars. Because the investment in Project B is riskier than the investment in Project A...

**math**

A company manufactures x units of Product A and y units of Product B, on two machines, I and II. It has been determined that the company will realize a profit of $2/unit of Product A and a profit of $7/unit of Product B. To manufacture a unit of Product A requires 6 min on ...

**math**

The difference between two numbers is 3. Eight times the larger number is 10 times the smaller number. Write a system of equations describing the given conditions. Then solve the system by the substitution method and find the two numbers.

**math**

Determine graphically the? x-value when y equals 3y=3 in the given equation. y equals 5 minus x y=5-x

**C++ programming**

Elevator Bank Design and Implementation 1 Project Description The goal of this project is to design and develop C++ code and algorithms to control a bank of elevators, which services many oors and transports people \eciently ", that is, as per the given speci ...

**Math**

the thirteenth term of an arythmeticprogression is 27. given that the seventh term equals to three times the second term, find: the first term nd the common difference of the progression

**Life**

Fill In My Blank Spaces

**math**

Sam has twice as many books as Jim. If Sam gives 12 books to Jim, they will have the same number of books. How many books to they have altogether?

**Calculus**

Suppose the integral from 2 to 6 of g of x, dx equals 12 and the integral from 5 to 6 of g of x, dx equals negative 3 , find the value of the integral from 2 to 5 of 3 times g of x, dx

**Pre-Calculus**

How do I solve the equation: 3 = 2.1 sin[(pi/6)t - 5pi/6] + 3.2

**Math**

If cscØ = 4/3, find sinØ + sinØ cot^2 Ø

**Precalculus**

Every point in the plane has exactly two polar coordinates. A)The statement is true because every point in the plane has a unique polar representation. B)The statement is false because left parenthesis r comma theta right parenthesis equals left parenthesis r comma theta plus ...

**Precalculus**

Find the magnitude and direction angle ? of the vector. u=4(cos102°i+sin102°j)

**Physics**

A ball with mass m=1kg and speed vo=5m/sec elastically collides with a stationary, identical ball (all resting on a frictionless surface so gravity is irrelevant). A student measures the top ball emerging from the collision at at speed vt=4m/sec at an angle ?t ? 37°. a) ...

**History**

Which adjective best describes Ming China’s position toward European trade? a.diplomatic b.equivalent c.inviting d.restrictive

**Math**

It takes Marty 1 1/4 hours to get ready for school. If 1/5 of that time is used to shower, what fraction of an hour does it take him to shower?

**Social Studies**

ive been using this cite for a long time and i just got expelled from my school for plagerism. f#$% this!

**stats**

If a student answers 40 multiple choice questions, each with four possible answers, by guessing randomly, the probability that she answers at least 15 correctly

**Math**

Place grouping symbols to make the equation true: 3x5-8+7-3/6=13

**calculus**

Cars on a certain roadway travel on a circular arc of radius r. In order not to rely on friction alone to over come the centrifugal force, the road is banked at an angle of magnitude 0 from the horizontal. The banking angle must satisfy the equation rg tan 0 = v^2 where v...

**calculus**

A patrol car is parked 50 feet from a long warehouse The light on the car turns at a rate of 30 revolutions per minute. How fast is the light beam moving along the wall when the beam makes the fol lowing angles with the line perpendicular from the light to the wall? (a)=...

**calclus**

A fish is reeled in at a rate of 1 foot per second from a bridge 15 feet above the water. At what rate is the angle between the line and the water changing when 25 feet of line is out? (Assume the fish stays near the surface of the water.)

**Calclus**

A point is moving along the graph of y = 1/(1 + x^2) so that dxldt = 2 centimeters per minute. Find dy/dt for the following values of x. (a) X = -2

**calclus**

A point is moving along the graph of y = 11(1+x2) so that dx/dt = 2 centimeters per minute. Find dy/dt for the following values of x. (a) X = -2 (b) X = 0 (c)X=2 (d)X=10

**calculus**

A point is moving along the graph of y = x2 so that dx/dt is 2 centimeters per minute. Find dy/dt when (a)x = 0 and (b)x = 3.

**Calculus**

All edges of a cube are expanding at the rate of 3 centimeters per second. How fast is the volume chang ing when each edge is (a) 1 centimeter and (b) 10 centimeters?

**calculus**

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at the rate of 10 cubic feet per minute. The diameter of the base of the cone is approx imately three times the altitude. At what rate is the height of the pile changing when it is 15 feet ...

**Calculus**

A spherical balloon is inflated with gas at the rate of 20 cubic feet per minute. How fast is the radius of the balloon increasing at the instant the radius is (a) 1 foot and (b) 2 feet?

**Math**

The length of a rectangular board is 10 cm longer than its width. The width of the board is 26 cm. the board is cut into 9 equal pieces. What is the area of each piece? What are the possible dimensions of each piece?

**Physics**

If C⃗ = -5 i^ - 3 j^ - 4 k^, what is C⃗ × j^? If = -5 - 3 - 4 , what is × ?

**US history**

how did the Virginia colony survive with the help of the English colonists?

**Geometry**

A rectangular prism is measured 84 cm(l) x 42cm (w) x 56cm h. What is the largest size cube that fits the dimensions of the prism? Number of cubes required? Maximum length of the edge of the cube that fits 64cm, 42cm, and 56cm is _____cm. Number of cubes____

**Math**

simplify 10×10^4+2.8×10^6

**Statistics**

How do I answer: A normal distribution has a standard deviation equal to 39. What is the mean of this normal distribution if the probability of scoring above x = 209 is 0.0228

**Algebra**

I need some help on this math problem. 3c^2 - 5c - 7.8 = -2.2

**math**

does the bar around the x have anything to do with the problem.

**math**

im sorry the question is Write an integer for each expression: [x} if x = -12

**math**

can someone explain how to solve just not answer: IxI if x = 12 the I are a bar?

**Math**

On a 20 question math test, your teacher gives you five points for every correct answer and takes away one point for each incorrect answer. If you score 70 on the test, how many did you get correct?

**Math**

On a 20 question math test, your teacher gives you five points for every correct answer and takes away one point for each incorrect answer. If you score 70 on the test, how many did you get correct?

**Geometry**

Explain why knowing a combination of four pairs of equal sides or equal angles guarantees one of the congruence relationships.

**Math- Geometry**

Explain why knowing a combination of four pairs of equal sides or equal angles guarantees one of the congruence relationships.

**Math**

Prove that an exterior angle of a triangle is equal to the sum of the non adjacent interior angles of that triangle. Use the following variables in your proof. Exterior angle=w Interior adjacent angle= x Interior non adjacent angle1= y Interior non adjacent angle2= z

**Math**

A 2-digit number is twice the difference of its digits. What is the number?

**Math**

A 2-digit number is twice the difference of its digits. What is the number?

**Math**

Six apples cost as much as four pears. Each pear costs $4 more than each Apple. What is the cost of one pear?

**Calculus**

Evaluate as limit approaches 0. (Without using l'hopital's rule. ( Sqrt(4+sin(x))-2 ) / (3x)

**Chemistry**

Calculate the total amount of heat that must be added to convert 15.7g of ice at its melting point to steam at 100.0°C

**Science**

A transformer with 1890 turns in its primary coil has to decrease the voltage from 4620 V to 220 V for home use. How many turns should there be on the secondary coil?

**Physical Science**

A 20.0-Ù resistor and a 45.0-Ù resistor in parallel are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? current through the 20.0-Ù resistor: Incorrect: Your answer is incorrect. . A current through the 45.0-Ù ...

**English**

Ms. Sue, it was A, you were wrong. I should have put what i thought.

**English**

Thanks, and is the second one A

**English**

Nine Haikus During a Drought In the dusty lane A frog waits for a puddle To fall from the sky Which form best describes this poem? A. limerick B. Haiku C. Concrete D. Narrative My choice is B. Haiku What about the poem best supports the answer to the previous question? A. It ...

**science**

A bullet of 29g is shot from a gun of mass 20kg with a muzzle velocity of 200ms if the bullet is 30cm long.determine. a)acceleration of the bullet b)the recoil velocity of the gun

**physics**

4. A gun’s bullet was launched horizontally with a speed 600m/s. It fell to the ground 300m away from the gun. a. How long was the bullets flight? b. At what height was the gun’s barrel at the moment of the shot? 5.

**physical science**

A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what angle was the ...

**Chemistry**

Given that ΔH (fusion) of water is 6025 J/mol, Cp,m(ice) = 37.7 J K–1 mol–1, and Cp,m(water,liquid) = 75.3 J K–1 mol–1, calculate ΔG (in J) for the freezing of 89 moles of water at 1 atm pressure and the constant temperature T = 14.4 °C. I got...

**engineering science**

calculate the work done required to push a car for 420 meters up an melon the force required to push the car is equal to 615n

**chemistry**

A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 4.00 atm C. 0.500atm

**Math**

$60

**Math**

Not sure how to solve 0.3x??

**Math**

How is that the ansswer. The discount was $18 it ask the original price of the coat with a 30% discount?

**Math**

Jane buys a coat that is $18 off the orinigal price. This is a 30% discount. What is the original price of the coat? Please explain how to get answer? Thanks

**math**

Don't get it I'm in 4th grade

**math**

Don't get it

**math**

No

**math**

Answer my question please

**math**

Taylor's home street address number has five digits. Two digits have values of 60,000 and 300.the last digit is 9.the value of each of the other digits is ten times the value of the digit on it's right. What's Taylor's home street address number.

**math**

Susie loves Starbucks coffe today,while waiting to place her order for her salted caramel macchiato , she noticed the prices for the three sizes that were available 12oz for $3.60 16oz for $4.96 20oz for $5.20 which size is the better unit rate

**Math**

Missing base 1/9= [. ] with exponent 2 please explain how I can get the answer thanks

**Math**

Missing exponent of 1/169=(1/13) please explain how I can find the missing exponent

**English**

Background Your favorite cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You know she plans to apply at similar stores in your town. But you also know she is a perfect match for...

**math**

if i ran 1&5/8 mile and than later ran 9/10 of a mile what is the amount

**math**

Problem with your example is that the product of 4x5 is 20 then you would add the two zeros to complete the strategy giving the proper answer of 2000.

**Chemistry**

Apologies, the numbers corrected are: 40.0 ml of 2.50 M KOH to prep a solution that is 0.212 M

**Chemistry**

How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?

**Math**

otto spent 3/4 of the money he had saved on a new video game. if the game cost $48, how much money did he have before he bought the game?

**Southridge**

What's the process if the input numbers are 1,2,3,4,5 and the output numbers are 2,5,10,17,26

**Math**

On a ruler that measures both metric and English units, we see that 1m=39.37 in. This implies that 2m = 78.74 in. Use this information to write an equation to convert x in. to y meters.

**math**

simplify: 5-(-3)^2 -6

**nyonithwele**

math: 38 learners at a high school,24play hockey,30play netball and 4play neither hockey nor netball.use venn diagram

**Physics**

Two charged particles have equal mass and carry charges of 2 nC and 3 nC respectively. They enter a magnetic field of strength 2 mT at the same velocity. Assuming that both particles exit the field parallel to each other and perpendicular to the field, determine the separation...

**physics**

the Apollo 10 spacecraft traveled at 11 km/s just prior o its re-entry, setting a speed record for humans. Suppose advanced technology raises the speed record by a factor of 100, to 1100 km/s. if a time travel of 1 hour elapsed on a ground-based clock, by how many seconds ...

**Math**

there are 600 fruits in a supermarket. If .64 are oranges and the rest are apples how many more oranges than apples are there

**calc**

I am having problem with the 1oo n. I know by taking the limit to the 1/n power gives me e in the denominator. How and what does (100n)^1/2n become?

**calc**

use the root test to to determine the convergence or divergence of the series 100n/e^n

**algebra**

bruh this girl says its wrong then doesn't put the right answer what the fffffff

**math**

1000ml x 15 gtt x 1 hr = 31 gtt 8hr ml 60 min How do you do this???

**English**

Dragonwings by Laurence yep What conflict is left unresolved at the end?

**7th grade English**

Both the authors of Zoos: Joys or Jails and the author of Why do we need Zoos : a. think animals should live in their natural habitat b.believe animals are protected in zoos c.wish people would make donations to zoos d. want to help wild animals, esp. endangered ones.

**math**

A 110lb woman is started on a nitroglycerin IV drip. The order is to administer the Nitro at mcg/min. The pharmacy sends a 250 ml IV container with 25 mg of nitro added to the container. What is the flow rate in ml/hr that the IV should run?

**math**

How many mls of 45% dextrose and 15% dextrose do you need to make 780 mls of 35% dextrose