# Posts by sam

Total # Posts: 5,170

**physics **

A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the left atrium of the heart and subject to this ...

*March 23, 2017*

**Pre-cac**

Find a such that f(x)= ax^2-3x+5 has a maximum value of 15. I'm stuck because how am I suppose to complete the square? 3/2= 1.5? then square 1.5? So lost.

*March 23, 2017*

**Help please I am lost, algebra**

thank you

*March 23, 2017*

**Help please I am lost, algebra**

I have notes on this from online but they are different from this problem and I don't know how to solve it. Find the equation of a line with the given information: slope -5/4 and g(14)=-6 It is asking for, point slope form, slope intercept form, Function form, if vertical ...

*March 23, 2017*

**Chem: please help**

Calculate the concentration of a solution prepared by adding 15.00 mL of 2.10 X 10^-3 M KMnO4 from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water.

*March 22, 2017*

**chemistry **

consider equilibrium equation below `Mg(NO3)2(aq) + 2Na(OH)(aq) <--> Mg(OH)2(s) + 2NaNO3 (aq) If NH3 is added, according to Le Chatelier's Principle, which way would reaction shift?

*March 19, 2017*

**calculus **

In electrical engineering, a continuous function like f(t)=sin(t), where t is in seconds, is referred to as an analog signal. To digitize the signal, we sample f(t) every ?t seconds to form the sequence Sn= f(n?t). For example, sampling f every 1/10 second produces the ...

*March 19, 2017*

**physics**

Two Children,A and B, fire identical 10g ball bearing from a catapult. The elastic band of each catapult is elastically extended by 0.10m and then released to fire a the ball bearings. Child A's elastic band has a spring constant of 144 N/m. Calculate the energy ...

*March 18, 2017*

**Chemistry**

A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate (with the fillers removed). The solid ...

*March 13, 2017*

**Math**

F(x) = -x^2 - x +2 graph function identify the vertex and axis of symmerty. Can some one explain the steps to get answer? I know I need to find the points on a graph just so confused

*March 10, 2017*

**calculus **

You are visiting your friend Fabio’s house. You ?nd that, as a joke, he ?lled his swimming pool with Kool-Aid, which dissolved perfectly into the water. However, now that you want to swim, you must remove all of the Kool-Aid contaminated water. The swimming pool is round...

*March 9, 2017*

**Math**

1/4

*March 9, 2017*

**calculus **

A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax^2 about the y-axis. If the dish is to have a 6-foot diameter and a maximum depth of 2 feet, ?nd the value of a and the surface area (in square feet) of the dish.

*March 7, 2017*

**Probability**

A lightbulb is installed. With probability 1/3, it burns out immediately when it is first installed. With probability 2/3, it burns out after an amount of time that is uniformly distributed on [0,3]. The expected value of the time until the lightbulb burns out is

*March 7, 2017*

**Probability**

Suppose that X has a PDF of the form f(x) {1/x^2 if x>= 1 { 0 otherwise For any x>2, the conditional PDF of X, given the event X>2 is (Your answer should be an algebraic function of x)

*March 7, 2017*

**calculus **

To ?nd the length of the curve de?ned by y = 5x^3+9x from the point (-3,-162) to the point (1,14), you’d have to compute the integral [a,b] f(x)dx where a = b = f(x) =

*March 4, 2017*

**Math**

What were the answers?

*March 3, 2017*

**calculus **

Find the volume of the solid obtained by rotating the region bounded by the given curves about the speci?ed axis. x+y = 3, x = 4?(y?1)^2; about the y-axis.

*March 2, 2017*

**calculus **

Find the volume of the solid obtained by rotating the region bounded by the given curves about the speci?ed line. x = 1?y^4, x = 0; about x = 1.

*March 2, 2017*

**Personal Finance**

Freddie Sue has a monthly gross income of $2950 and total monthly debt payments of $160. She will have to make a down payment of 15% of the purchase price of a new home and estimates that the monthly property tax and insurance cost will be $210. If she can get a 30 year loan ...

*March 1, 2017*

**calculus **

The base of a certain solid is the triangle with vertices at (?6,3), (3,3), and the origin. Cross-sections perpendicular to the y-axis are squares. Then the volume of the solid?

*February 28, 2017*

**calculus **

Find the area of the region between the curves y = x^2 and y = 2/(x^2+1).

*February 28, 2017*

**calculus **

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then ?nd the area of the region. y = 5x^2 and y = x^2+6

*February 28, 2017*

**calculus **

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y = 4?x and y = 5 and 2y+2x = 6.

*February 28, 2017*

**Social Studies Help ASAP Please!**

So would it be A? (I'm between A and D now.)

*February 25, 2017*

**Social Studies Help ASAP Please!**

Resistance to Immigration Nativists believed that some immigrants did not fit into American culture because their customs were to different ---> Prejudice and violence grew as the number of Chinese immigrants increased ---> ? Based on your reading, which statement best ...

*February 25, 2017*

**physics**

A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the ...

*February 21, 2017*

**Math**

x=number of animals with 4 legs y=number of animals with 2 legs 36= total number of legs 10= total number of animals x+y=10 x=10-y 4x+2y=36 4(10-y)+2y=36 40-4y+2y=36 -2y=-4 y=2 x=8

*February 21, 2017*

**Math**

Correction: Should be 8 animals with 4 legs and 2 animals with 2 legs.

*February 21, 2017*

**Math**

10 with 2 legs and 4 with 4 legs

*February 21, 2017*

**Math, data management**

Let's say N=10 a=4 2s b=3 3s c=3 7s Therefore, 10!/(4!×3!×3!)=4200 I hope it helps

*February 21, 2017*

**math**

The Toro Ski club is planning a ski trip for the upcoming long weekend. They have 40 skiers signed up to go, and the ski resort is charging $120 per person. The resort manager offers to lower the rate per person by $2 for each additional skier up to a maximum number m. (So if ...

*February 21, 2017*

**math**

If a hen and a half can lay an egg and a half in a day and a half, then how much time is needed for three hens to lay three eggs?

*February 21, 2017*

**physiology**

how many grams of glucose (180grams/mole) to make a 13% glucose solution with a final volume of 600 milliters.

*February 20, 2017*

**History World**

Could this be in Russia defaults on its debt? Before the revolution, czarist Russia regularly sold bonds abroad to finance the country's economic development. The loans helped finance 40,000 miles of railroad, including the Trans-Siberian, as well as ports, factories and ...

*February 16, 2017*

**History World**

France developed a political alliance with Russia Austria- Hungary demanded equal support from France Germany canceled its alliance with France.

*February 16, 2017*

**History World**

Which of the following results from France giving Russia a loan to Build the Trans-Siberian railway? I think it's Russia defaults on its debt making an enemy of France.Don't I can't find anything. Help please

*February 16, 2017*

**urgent math help plz !!**

The angle ? lies in Quadrant II . sin?=34 What is cos? ? ?7?/4 7?/4 3/4 ?3/4 <my answer

*February 16, 2017*

**Earth Science**

Slide 1 This is a cumulus cloud. Can you find four things on the word list that you can use to describe this cloud. Cumulus clouds consists of puffy tops, no rain expected, 3,000 ft. high, and flat bottoms. Slide 2 This is an example of towering cumulus clouds. Write down as ...

*February 16, 2017*

**Math**

The functions of f(x), g(x), and h(x) are defined below: f(x) = -2x g(x) = 2x + 5 h(x) = x^2 + 3x - 10 Calculate the indicated function values. 1. f(a+b) 2. f(g(x))

*February 16, 2017*

**fluid**

1. A vertical seawater lock is 4m wide and 2m high. The water level is 2 m above the base of the lock on one side, there being no water on the other side. The mass of the lock is 2.5 t and the coefficient of friction between the lock and the slides is 0.25. Determine the ...

*February 16, 2017*

**Math question**

A cone-shaped container has a height of 9 in. and diameter of 2 in. It is filled with a liquid that is worth $2 per cubic inch. What is the total value of the liquid in the container? Use 3.14 for ? . Enter your answer in the box. I think it's 18.84 can someone check my work?

*February 15, 2017*

**Language Arts**

Ok, thanks for checking...appreciate it. (=

*February 14, 2017*

**Language Arts**

What is the meter of line 6? A wildcat roaring past steep banks A)stressed, unstressed, stressed, unstressed, stressed, unstressed, stressed, unstressed B)unstressed, stressed, unstressed, stressed, unstressed, stressed, unstressed, stressed*** C)unstressed, unstressed, ...

*February 14, 2017*

**science**

does condensation or evaporation occur on a cold can of juice is put on the table on a hot day

*February 9, 2017*

**Chem**

We will calculate the amount of acid to use in each titration. Assume that you are using 0.0512 M NaOH(aq). A good volume of NaOH(aq) to use per titration is 15 mL. From this molarity and volume, the moles of NaOH can be calculated. Since the unknown acid is monoprotic, this ...

*February 8, 2017*

**mATH**

YOU DEPOSIT $520.00 IN AN ACCOUNT WITH 4% INTEREST COMPOUNDED MONTHLY WHAT IS THE BALANCE IN THE ACCOUNT AFTER 5 YEARS 520 X 1 + 0.04/12^60 IS THIS RIGHT WAY TO DO THIS

*February 8, 2017*

**Math**

Does the function represent exponential growth or exponential decay. Identify the growth or decay factor. y=9 x (1/2) I'm not sure how to make the chart to show the decay.

*February 6, 2017*

**Math**

the speed of sound is approximately 1.2 x 10^3km/h how long does it take for sound to travel 7.2 x 10^2km. answer in minutes

*February 6, 2017*

**Biochemistry**

Describe the preparation of 2.00 L of 0.100 M glycine buffer, pH 9.0, from glycine and 1.00 M NaOH. a) What mass of glycine is required? The appropriate pKa of glycine is 9.6. b) What volume of 1.00 M NaOH is required? The appropriate pKa of glycine is 9.6.

*February 5, 2017*

**Math**

I have worked and reworked this problem, but I cannot seem to figure it out. Can anyone help? Jeffries & Sons is borrowing $95,000 for four years at an APR of 7.05 percent. The principal is to be repaid in equal annual payments over the life of the loan with interest paid ...

*February 5, 2017*

**Finance**

Solved! :)

*February 5, 2017*

**science**

A stone is dropped from a balloon going up with a uniform velocity of 5.0 m/s. If the balloon was 50 m high when the stone was dropped, find its height (in meters) when the stone hits the ground. Take g = 10 m/s2 (A) 50 (B) 58 (C) 68 (D) 78.5

*February 3, 2017*

**Maths**

A quadrilateral is called cyclic if its corners lie on the circumference of a circle. An example is shown below left: the circle has radius 5 The area A of the quadrilateral for different x values is plotted on the right. It can be calculated that this curve has derivative: dA...

*February 2, 2017*

**algebra**

A vat contains 8080 gallons of a fruit juice mixture that is 30%30% orange juice. How many gallons of the mixture should be drained and replaced with pure orange juice to make the mixture 80%80% orange juice? Round your answer to two decimal places, if necessary.

*February 1, 2017*

**English**

Gerbner is an author who wrote the book : "society storyteller"

*January 28, 2017*

**English**

identify one of Gerbner's main arguments,and then come up with a TV show that could serve as an example for that point

*January 28, 2017*

**English**

what is Gerbner's thesis statement?

*January 28, 2017*

**psych**

Identify each of the following consequences either positive reinforcement (PR), negative reinforcement (NR), negative punishment (NP) or positive punishment (PUN). NP 1. A teacher meeting with a parent makes that parent feel less powerful by having her sit on small, ...

*January 27, 2017*

**psych**

identify if it is Fixed Ratio (FR), Variable Ratio (VR) Fixed Interval (FI) Variable Interval (VI) VR 1. Getting paid for every widget you put on a machine in a factory VI 2. Pop (surprise) quizzes VR 3. Slot machines at Foxwoods casino FI 4. Getting to play computer games ...

*January 27, 2017*

**Maths**

A FARMER SPENDS $1000 AND BUYS 100 ANIMALS. THE PIGS COSTS $100 EACH, THE GOATS $30 AND THE CHICKS $5. THE FARMER BUYS AT LEAST ONE OF EACH ANIMAL, WHAT DOES HE BUY?

*January 27, 2017*

**Precalculus**

The roots of \[z^7 = -\frac{1}{\sqrt{2}} - \frac{i}{\sqrt{2}}\]are $\text{cis } \theta_1$, $\text{cis } \theta_2$, $\dots$, $\text{cis } \theta_7$, where $0^\circ \le \theta_k < 360^\circ$ for all $1 \le k \le 7$. Find $\theta_1 + \theta_2 + \dots + \theta_7$. Give your ...

*January 27, 2017*

**Precalculus**

The roots of \[z^7 = -\frac{1}{\sqrt{2}} - \frac{i}{\sqrt{2}}\]are $\text{cis } \theta_1$, $\text{cis } \theta_2$, $\dots$, $\text{cis } \theta_7$, where $0^\circ \le \theta_k < 360^\circ$ for all $1 \le k \le 7$. Find $\theta_1 + \theta_2 + \dots + \theta_7$. Give your ...

*January 27, 2017*

**Precalculus**

What is the smallest positive integer $n$ such that all the roots of $z^4 + z^2 + 1 = 0$ are $n^{\text{th}}$ roots of unity?

*January 27, 2017*

**Math**

The Statue of Liberty is 305 feet tall. What scale would be used to make a model 20 inches high?

*January 26, 2017*

**Math**

Thanks so much

*January 26, 2017*

**Math**

If 4.5 inches on a map convers 270 miles, what is the scale of inches to miles?

*January 26, 2017*

**Math**

chris cuts boards that are 2/3 feet long. He has a 7/9 foot long board of wood. How many yards can he cut?

*January 24, 2017*

**Physics**

Two point charges each have a value of 3 ?C and are 10 cm apart. What is the electric field at the midpoint between the two charges?

*January 22, 2017*

**Precalculus**

Yeah, that is the real solution. I also need to find the complex solution as well.

*January 22, 2017*

**Precalculus**

The question latex was messed up, it is: Find all $x$ such that \[x^6 = (x+1)^6.\]

*January 22, 2017*

**Precalculus**

Find all xx such that [x6x6 = (x+1)6(x+1)6]. So far, I have found the real solution x= -1212, and the complex solution x = -?1????3?13. Are there more, and if so what/how would be the most efficient find all the solutions to this problem? I am struggling to find the rest of ...

*January 22, 2017*

**Math**

What is the value of x if 36x=4 ?

*January 20, 2017*

**Math**

36x=4

*January 20, 2017*

**Precalculus**

What are all the complex and real solutions for x? Where: (x+1)^6 = x^6 and x is complex? The real solution is -1/2 and, the only other solution I could find was x = -(-1)^(1/3)

*January 19, 2017*

**Physical Science**

A step-up transformer has primary coil with 15 turns. How many turns would be required in the secondary coil to increase the voltage from 60 v to 160 v? 15 x=160/80 x=80/15 x=?

*January 12, 2017*

**Math**

Convert $e^{-\pi i}$ to rectangular form. Not sure how to start this problem, should I use Euler's formula? Can anyone help provide the steps please? Thanks

*January 11, 2017*

**IPC**

The value of acceleration due to gravity (g) on a point 10,000 kilometers above sea level is about 1.49 meters/second2. How much will an object, which weighs 98 newtons on the surface of Earth, weigh on this point? The value of acceleration due to gravity on Earth is 9.8 ...

*January 11, 2017*

**Math**

Suppose that 32 feet of fencing is available to enclose a rectangular garden., one side of which will be against the side of a house. What dimensions of the garden will guarantee a maximum area?

*January 9, 2017*

**Math**

A shop owner blends three types of coffee,A,B,C.in the ratio 3:5:7 a) calculate the weight of each type of coffee in 45kg of three blended mixture. b) given that type A coffee cost $7 per kg, type B coffee costs $10 kg and type C coffee costs $13 per kg, calculate the cost per...

*December 31, 2016*

**micro economics I**

show the MRS for Cobb Douglass preference is ax2/bx1

*December 28, 2016*

**maths**

The line segment connecting A(-18,8) and B(-10,-8) is divided in the ratio 1:3 by point C. The coordinates of C are... Please show your working and thx for taking your time to answer this question.

*December 23, 2016*

**Algebra 1**

A square painting is surrounded by a frame. the outside edges of the frame are x inches in length, and the frame is 3 inches thick. What is the total area of the frame? A)-12x+36 B)12x-36 C)x^2+12x+36 D)x^2-12x-36 Is it C or D?

*December 22, 2016*

**Algebra**

Wait, nevermind my previous answer...is it B?

*December 22, 2016*

**Algebra**

What type of polynomial is this? 2 - 5x^3 + 6x A)not a polynomial B)cubic trinomial C)quadric trinomial D)fourth-degree trinomial Since the degree is 4, I think the answer is D. Is this correct?

*December 22, 2016*

**Algebra 1**

GCF*

*December 20, 2016*

**Algebra 1**

Find the GFC of the terms of the polynomial. 14z^5-70z^4+10z^3 Is the answer 14? I'm not really sure. Can someone please help?

*December 20, 2016*

**Management**

can you tell me the reason

*December 17, 2016*

**Management**

planning about the companys goal

*December 17, 2016*

**Management**

Is pressure of work barrier for planning

*December 17, 2016*

**Management**

Is pressure of work a barrier for planning?

*December 17, 2016*

**algerbra**

an object is projected upward at a rate of 96 feet per second. find the time when it is 144 feet above the ground

*December 15, 2016*

**algebra**

1/b(2b-10)=17 1/b*2b=2 1/b*10=10/b 2-10/b=17 -10/b=15 The answer is -2/3

*December 14, 2016*

**pre-calculus**

A rectangular box has a perimeter of 50 inches. Find the length and width of the box that would give the maximum area. Find the maximum possible area of the box.

*December 12, 2016*

**pre-calculus**

A rectangular box has a perimeter of 36 inches. Find the length and width of the box that would give the maximum area. e. l = 9, w = 9 f. l = 81, w = 9 g. l = 27, w = 9 h. l = 18, w = 18

*December 12, 2016*

**pre-calculus**

A rectangular box has a perimeter of 36 inches. Which of the following equations represents the area of the rectangular box in terms of its width, w? a. A = 36w - w2 b. A = 18w - w2 c. A = 36 - w2 d. A = 18 - w2

*December 12, 2016*

**Chemistry**

Thank you!

*December 12, 2016*

**Chemistry**

What is the concentration of Pb in mg/L , if you have 25 mg Pb in 5kg of seawater? (note: density of seawater is 1.025 kg/L)

*December 12, 2016*

**Chemistry**

Using the fact that fresh water has a density of 1000 kg/m3 , show that 5ppm Pb = 5 mg/L Pb .

*December 12, 2016*

**precalculus**

convert r sin? = 2 to rectangular form

*December 9, 2016*