Thursday

February 23, 2017
Total # Posts: 8,249

**Science**

Which material is the densest air,water,plastic,or iron

*February 23, 2017*

**Math**

What Is the measure of an angle that is complementary to a 47 degrees angles? A. 43 degrees B 53 degrees~~~ C. 153 Degrees D. 180 Degrees

*February 23, 2017*

**Math**

Explain How To Construct A Perpendicular bisector

*February 23, 2017*

**Math**

5229

*February 23, 2017*

**math**

f(x)=ax^3+bx^2+cx+d and f(0)=-18 determine the equation of f

*February 23, 2017*

**English**

I need help on these four questions. I was sick from class one day and now I am very confused about what is happening in Romeo and Juliet. Here are the questions in need help with: 15. A foil is a character that highlights, through sharp contrast, another character's ...

*February 21, 2017*

**Pre Calculus 30**

1.How many positive three-digit integers can be made from the digits {3,4,5,6,7} if digits may be repeated? 5x4x3=60 2.In how many ways can all of the letters of the word HEXAGON be arranged if the arrangement must start with a consonant and end in a vowel? 4x3x1x2x3x4x5=1440 ...

*February 20, 2017*

**Pre Calculus 30**

I'm having a hard time understanding the fundamental counting principal and I don't even know where to start on some of the questions.Here are a few questions I'm having trouble with. 1.Andrea, Brian, Carol, David, Emmalee, Floyd, and Gloria are to stand in a line ...

*February 20, 2017*

**Vectors**

1.7 km wide. Srry

*February 20, 2017*

**Vectors**

A boat is capable of 20 km/h in still water. You wish to cross the river downstream so that the angle the boat's push makes with the bank is 50 degrees. At what angle to the bank should the boat steer if the current is 8 km/h? How long will it take to cross if the river is...

*February 20, 2017*

**chemistry**

You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution?

*February 19, 2017*

**chemistry**

What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?

*February 19, 2017*

**chemistry**

What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?

*February 19, 2017*

**chemistry**

What volume of a 3.90 M KI stock solution would you use to make 0.430 L of a 1.25 M KI solution?

*February 19, 2017*

**chemistry**

i got this one wrong

*February 19, 2017*

**chemistry**

How many grams of CaCl2 would be dissolved in 1.1 L of a 0.17 M solution of CaCl2?

*February 19, 2017*

**math**

a cyclist rides for 5 hours at a certain speed and then for 4 hours at a speed 6 km/h greater than her original speed. If he rides 294 km altogether, what was her initial speed?

*February 18, 2017*

**Math Help**

If 4 cards are drawn randomly from the standard deck of 52 cards, what is the probability that all 4 cards are red cards? How would I set this up? there are 26 red cards So I would take 26/52 and 48/52? If this is correct, would I multiply them? Thanks

*February 16, 2017*

**Math **

The diagonal of a square garden 17ft. Determain the perimeter of the garden, rounded to 3 decimal places.

*February 16, 2017*

**Math (Algebra 2)**

Ann and Tom want to establish a fund for their? grandson's college education. What lump sum must they deposit at a 9.39?% annual interest? rate, compounded annually?, in order to have ?$20,000 in the fund at the end of 10 ?years? I cannot get the right answer.

*February 16, 2017*

**Algebra**

What is the value of n such that 2^n=4^4 x 8^8 x 16^16?

*February 12, 2017*

**Cmax**

Thanks Steve. How would I use the ln function instead of e on the calculator? It's been ahile since I took algebra. So e equals ln?

*February 9, 2017*

**Cmax**

How do I solve for Cmax= 8.5/ e(-0.257 * (1-0.5))? Also, how would I input 'e' in my calculator?

*February 9, 2017*

**Continuity Calculus Help**

Find the value of constants c and d that make the function below continuous at x = 4. f(x) = x2 ? 3x x < 4 c x = 4 d + x x > 4 c = d = 8 I got d=8, but finding c is giving me trouble.

*February 8, 2017*

**Continuity Calculus Help**

9.0/1 points | Previous Answers SSTCalc6 2.3.046.My Notes Question Part Points Submissions Used Let f(x) = 4x2 if x > 2 4x + 3 if x ? 2. Show that f is continuous from the left at x = 2, but not from the right. lim f(x) = n?2? f(2) = lim f(x) = n?2+

*February 8, 2017*

**Physics**

Car A is 12 m ahead of car B on a straight stretch of road. Car A starts from rest and accelerates away from B at 4.0 m/s2. Two seconds later B starts from rest and accelerates after A at 6.0 m/s2. How long will it take B to catch A? How far will B have travelled?

*February 7, 2017*

**Math**

Prove that limit(z -> z_0) z^2 = z_0^2 I must show that for any positive number E that there exists a positive number delta so that whenever this is true: 0 < |z - z_0| < delta then this is true: |z^2 - z_0^2| < E

*February 5, 2017*

**Pre-Calculus**

u dot v / |v| (1.6*-2.1 + 3.3*-0.5) / sqrt(2.1^2 + 0.5^2) -2.32

*February 5, 2017*

**Chemistry**

Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy difference between the ...

*February 4, 2017*

**Physics**

A hollow sphere has a uniform volume charge density of 4.61 nC/m3. The inner radius is a = 14.6 cm and the outer radius is b = 43.8 cm. What is the magnitude of the electric field at 21.9 cm from the center of the sphere? What is the magnitude of the electric field at 140. cm ...

*February 3, 2017*

**Science**

The doctor ordered an IV infusion of NaCl at 125 ml/hr for the next 48 hours. THe drop factor for the IV tubing is 10. 1) calculate the gtts/min Answer: 23 gtts/min 2) calculate the total amount of IV fluid the client will receive in 48 hours. I got 6000 ml.... Anyone check ...

*January 30, 2017*

**Calculus can you please show me the step by step s**

The intensity of light varies inversely as the square of the distance from its source. If two searchlights are 600 meters apart and one light is 8 times as strong as the other, where should a man cross the line between them in order to be illuminated as little as possible

*January 28, 2017*

**Calculus**

The intensity of light varies inversely as the square of the distance from its source. If two searchlights are 600 meters apart and one light is 8 times as strong as the other, where should a man cross the line between them in order to be illuminated as little as possible

*January 28, 2017*

**chemistry**

an over the counter pain reliever melts at 78degree celcius. convert this temperature to f and k

*January 25, 2017*

**chemistry**

how many fluid ounces are contained in 1qt of milk. 2.how many cups are contained in 1l of soda

*January 25, 2017*

**chemistry**

how many fluid ounces are contained in 1qt of milk how many cups are contained in 1l of soda

*January 25, 2017*

**chemistry**

a woman was told to take a dose of 1.20g of calcium daily ,how many 200mg tablets should she take^

*January 25, 2017*

**Math**

A dessert recipe calls for2 1/2 cups of milk how. Many cups of milk are needed for 8 servings?

*January 24, 2017*

**math**

An investment of 25,000 earns interest at an annual rate of 8.4% compounded continuosly a. find the instantaneous rate of change of the amount in the account after years b. find the instantaneous rate of change of the amount in the account at the time the amount is eqaul to 30...

*January 22, 2017*

**Chemistry**

Calculate deltaH for the reaction NO (g) + O (g) ----> NO2(g) given following NO + O3 ----> NO2 + O2 deltaH=-198.9 kj O3 ---> 3/2 O2 deltaH= -142 kj O2 -----> O2(g) deltaH=495

*January 21, 2017*

**physics**

A hoodlum throws a stone vertically downward with an initial speed v0 from the roof of a building, a height h above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of the stone at impact? Give your answers in terms of the given ...

*January 19, 2017*

**physics**

A hoodlum throws a stone vertically downward with an initial speed v0 from the roof of a building, a height h above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of the stone at impact? Give your answers in terms of the given ...

*January 19, 2017*

**Math Help **

I am trying to work this problem out. I know that the systematic counting principle is used. However, I cannot get the right answer. For the first part, I took R=2 N=6 6!/(6-2)! (Permutation). Answer: 30 choices for the Chair/Vice The second part, I took R=2 N=8 Combination ...

*January 18, 2017*

**Math**

I am trying to work this problem out. I know that the systematic counting principle is used. However, I cannot get the right answer. For the first part, I took R=2 N=6 6!/(6-2)! (Permutation). Answer: 30 choices for the Chair/Vice The second part, I took R=2 N=8 Combination ...

*January 18, 2017*

**math**

Two number are in the ratio 4:7 if the smallest is 36 what is the largest number?

*January 17, 2017*

**Math**

find f'(x) find the slope of the graph of f a x=2 and x=4 find the equations of the tangent lines at x=2 and x=4 and find the value(s) of x where the tangent line is horizontal. f(x)=2x^2+8x I found that f'(x)=4x+8 and that the slopes were 16 and 24 and the equations ...

*January 16, 2017*

**mathematics**

the first four terms of an arithmetic sequence are -1

*January 15, 2017*

**Math**

Four hours after the start of a 600 mile auto race, a driver's velocity is 150 miles per hour as she completes the 352nd lap on a 1.5 mile track a) find the drivers average velocity during the first four hours of the race. b) let f(x) represent the distance traveled (in ...

*January 11, 2017*

**Math**

Find the limit f(x) = -(x^2)/(x+3) a) lim f(x) x-3^- b) lim f(x) x-3^+ c) lim f(x) x-3 I know that a is dne because of the graph and that b is -infinity. And that c is dne because they are not the same. But I do not know how to do this algebraically. Thank you

*January 9, 2017*

**Calculus**

How do you find the total distance a particle travels on a given interval on a graph and net distance?

*January 5, 2017*

**Math **

Find the average rate of change in height of the orange from t=2 to t=5 (in feet per second) The equation is h (t)=605+15t-4.9t^2 in feet. I know the the average rate of change is change in q/ change in time. Do I put t=3 and subtract the quantity of 5 and 2 in the formula for...

*January 4, 2017*

**quantitative analysis for decision making**

. A food industry produces chips at three factories, located in Birmingham, Glasgow and London. Since the customer should be supplied with fresh products, these are not stored in the factories. The monthly production ability of the factory in London is 750 tones, while of the ...

*January 4, 2017*

**managerial Economics**

Yell-O Yew-Boats, Ltd. produces a popular brand of pointy birds called Blue Meanies. Consider the demand and supply equations for Blue Meanies: QD, x = 150 - 2Px + 0.001I + 1.5Py QS,x = 60 + 4Px - 2.5W Where Qx = monthly per-family consumption of Blue Meanies Px = price per ...

*January 4, 2017*

**Geometry**

A dilation scale factor 2 maps triangle RST to R'S'T'. The perimeter of triangle RST is 60. What is the perimeter of triangle R'S'T'?

*December 30, 2016*

**english**

can you give me a good topic for my english presentation test

*December 29, 2016*

**Math**

7+2+6 = 15 =17 8+ 3 + 7 =18 or maybe 8 + 2 + 7

*December 28, 2016*

**math**

At a basketball game, a vender sold a combined total of 116 sodas and hot dogs. The number of sodas sold was three times the number of hot dogs sold. Find the number of sodas and the number of hot dogs sold

*December 20, 2016*

**ss**

i need anwsers for this 1. What was the last battle associated with the War of 1812? (1 point) a.Battle of New Orleans b.Battle of "Old Ironsides"to B.attle at Montreal d.Battle at Baltimore 2. For what is the War of 1812 BEST remembered? (1 point) the Battle at New ...

*December 19, 2016*

**Algebra**

Mervin tells Aquilla that he has a bag with very small rocks in it. She asks how many, and he says that if you add one hundred million very small rocks to the bag, it will contain 36 more very small rocks than the number in ten thousand of the bags minus five times the number ...

*December 17, 2016*

**Physics wave motion**

A radar array consists of five vertical antennae arranged in a line, each emitting radio waves of frequency 120MHz in phase with one another uniformly in all directions. The spacing between each of the antennae is 8.0m. Apart from the normal direction perpendicular to the line...

*December 16, 2016*

**math**

The shape of a milk carton is a solid composed of a rectangular prism and a pyramid as shown. What is the formula for finding the volume of the milk carton?

*December 11, 2016*

**math**

1/27

*December 11, 2016*

**math**

A rectangular prism has a volume of 162 cubic centimeters. If the length, width, and height are reduced to 1/3 of their original size what will the new volume be?

*December 11, 2016*

**math**

6 cm^3

*December 11, 2016*

**math**

A rectangular prism has a volume of 162 cubic centimeters. If the length, width, and height are reduced to 1/3 of their original size what will the new volume be

*December 11, 2016*

**chemistry**

The edge of a body-centered-cubic unit cell ( which contains two atoms per unit cell) of an element Y was found to be 2.16x10^-8cm. The density of the metal is 19.35g*cm^-3. What is the approximate molar mass of Y?

*December 10, 2016*

**chemistry**

The edge of a body-centered -cubic unit cell (which contains two atoms per unit cell) of an element Y was found to be 3.16x10^-8cm.The density of the metalis 19.35g*cm^-3. What is the approximate molar mass of Y?

*December 10, 2016*

**precalculus**

Convert to Rectangular: r*tan?/sec?=2

*December 9, 2016*

**Algebra**

Students can buy tickets to a basketball game for $1.the addition for adults is $2 if 350 tickets were sold and the total money made was $450, how many student and adult were purchased?

*December 7, 2016*

**pre calculus**

In the rectangular coordinate system, each point (x, y) has a unique representation. Explain why this is not true for a point (r, ?) in the polar coordinate system.

*December 7, 2016*

**precalculus**

Convert to Polar: (3, -7) A) ( ?58, 337) B) ( ?58, 23) C) ( ?6, 337) D) ( ?6, 23) I do not know which is the correct answer because I worked it out and got (?58, -66.8014) Could you please tell mewhich answer is the right one

*December 7, 2016*

**precalculus**

Convert to Rectangular: r*tan?/sec?=2 ________________________________________ y=2 y=½ x=2 x=½

*December 7, 2016*

**precalculus**

can you please explain how you sketch a plane curve given by parametric equations? and explain what the orientation of a curve is?

*December 7, 2016*

**Chemistry Help**

You are required to make 500 mL of a buffer solution with pH = 5.0 and a total acetate concentration of 0.1000 M. You are supplied with solid sodium actetate (CH3COONa) and 2.00 M hydrochloric acid. What mass of sodium acetate and what volume of hydrochloric acid would you use...

*December 6, 2016*

**Calc**

A box has a bottom with one edge 6 times as long as the other. If the box has no top and the volume is fixed at V, what dimensions minimize the surface area?

*December 5, 2016*

**Math**

A company establishes a sinking fund in order to have 100,000 for upgrading office equipments in 4 years. If the company makes fixed monthly payments into an account paying 6.6% compounded monthly, how much should each payment be? How much interest will the account earn in 4 ...

*December 4, 2016*

**Math**

In the triangle ABC, AC=2cm, AB=x cm and angle ABC=?/2 rad. 1. Given that angle BAC=? rad, and that ? is a sufficiently small angle, show that x? a + b?^2, where a and b are constants to be determined. 2. For this part, ? is not assumed to be a small angle. The point N lies on...

*December 1, 2016*

**Math**

In the triangle ABC, AC=2cm, AB=x cm and angle ABC=?/2 rad. 1. Given that angle BAC=? rad, and that ? is a sufficiently small angle, show that x? a + b?^2, where a and b are constants to be determined. 2. For this part, ? is not assumed to be a small angle. The point N lies on...

*November 30, 2016*

**Calculus**

a projectile is fired vertically upward from ground level with a velocity of 1600 ft/sec. If air resistance is neglected, find its distance s(t) above ground at time t. What is its maximum height?

*November 29, 2016*

**Finite**

Kane Manufacturing has a division that produces two models of hibachis, model A and model B. To produce each model-A hibachi requires 3 lb of cast iron and 6 min of labor. To produce each model-B hibachi requires 4 lb of cast iron and 3 min of labor. The profit for each model-...

*November 29, 2016*

**maths**

A committee of 4people is to be chosen from 5 married couples. Find in how many ways the committee can be chosen if; 1) everyone is equally eligible. 2) the committee should include at least one woman

*November 24, 2016*

**Physics**

a great of effort, time, and money has been spent in the quest for the so-called perpetual-motion machine, which is defined as a hypothetical machine that operates or produces useful work indefinitely and/ or a machine that produces more work or energy than it consumes. ...

*November 16, 2016*

**Physics**

the human body is only about 25 % efficient at converting input chemical energy to useful work. where does the rest of the input chemical energy go?

*November 16, 2016*

**Chemistry**

There was two slides over this, but they both involved one element.

*November 15, 2016*

**Chemistry**

Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

*November 15, 2016*

**Chemistry**

Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

*November 15, 2016*

**Math !!!**

(9/10)*60=a a*(2/3)=b a-b= how much time is left

*November 14, 2016*

**Math**

sqrt(3) * sqrt(2x+3)=sqrt(5x-6) square roots are to the 1/2 power so what you can do is square both sides 2*(1/2)= 1 so the square roots cancel. It will look like this (sqrt(3)*sqrt(2x+3))^2=(sqrt(5x-6))^2 which will cancel out all the square roots. It will end up as 3*(2x+3)=...

*November 14, 2016*

**Math**

Is this (2x-7x-6)/4.7 or (2x-7)/4.7 *(x-6)?

*November 14, 2016*

**thomas middle such**

Hundreds digit is between 1-3. Tens digits are between 6-8. The ones digit is 4-6. The total amount of digits is 11. For example, it's not 386 because the total amount is 17 (3+8+6).

*November 14, 2016*

**Chemistry**

Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density of CaF2 from these ...

*November 14, 2016*

**chemistry**

The average molar mass of a natural gas is 17.4g/mol consisting of CH4 and C2H6,what is the molar fraction of each gas?

*November 14, 2016*

**Check spanish answers**

yo anonomys i also go to connections maybe we could help each other have an email i can text to contact you?

*November 14, 2016*

**Chemistry**

Oops, the hydrate is Copper Sulfate Pentahydrate

*November 13, 2016*

**Chemistry**

A chemist takes a 647 gram sample of this hydrate. She removes all the water possible from the sample and collects it. To this water, she adds 7.6 grams of lead(II) nitrate. Afterwards she wants to precipitate all the lead. She wants to use a solution of aluminum sulfate to ...

*November 13, 2016*

**Chemistry**

CH4 + 2O2 --> CO2 + 2H2O a. How many grams of methane are needed to produce 1.5 X 10^-2 grams of carbon dioxide? b. How many grams of oxygen are needed to react to form the 1.5 X 10^-2 grams moles of carbon dioxide?

*November 10, 2016*

**Chemistry**

CH4 + 2O2 --> CO2 + 2H2O a. How many grams of methane are needed to produce 1.5 X 10^-2 grams of carbon dioxide? b. How many grams of oxygen are needed to react to form the 1.5 X 10^-2 grams moles of carbon dioxide?

*November 10, 2016*

**Chemistry**

CH4 + 2O2 --> CO2 + 2H2O a. How many grams of methane are needed to produce 1.5 X 10^-2 grams of carbon dioxide? b. How many grams of oxygen are needed to react to form the 1.5 X 10^-2 grams moles of carbon dioxide?

*November 10, 2016*

**Chemistry**

Given 1 cc of Zinc and 1 cc of Cr What is the mass difference?

*November 9, 2016*

**Maths**

An athlete takes 2 minutes and 15 seconds to jog around a 400m running track. At this speed, how long will it take them to run 12km

*November 9, 2016*