Tuesday

September 23, 2014

September 23, 2014

Total # Posts: 264

**Math**

The batteries from a certain manufacturer have a mean lifetime of 890 hours, with a standard deviation of 90 hours. Assuming that the lifetimes are normally distributed, complete the following statements.
*June 8, 2014*

**help!! Chemistry**

Zn + VO3 ^- --> Zn ^2+ + V^+3 Fe ^2+ + H2O2 + OH- --> Fe (OH) 3 V2O5 + I- + H^+ --> VO2 + I2 + H20 P + H+ + NO3- + H2O -->'NO + H3PO4 RedOX REACTIONS
*June 6, 2014*

**Help Chemistry**

Like redox reactions
*June 6, 2014*

**Help Chemistry**

Zn + VO3 ^- --> Zn ^2+ + V^+3 Fe ^2+ + H2O2 + OH- --> Fe (OH) 3 V2O5 + I- + H^+ --> VO2 + I2 + H20 P + H+ + NO3- + H2O -->'NO + H3PO4
*June 6, 2014*

**Chemistry **

Zn + VO3 ^- --> Zn ^2+ + V^+3 Fe ^2+ + H2O2 + OH- --> Fe (OH) 3 V2O5 + I- + H^+ --> VO2 + I2 + H20 P + H+ + NO3- + H2O -->'NO + H3PO4
*June 6, 2014*

**algebra**

20x^2
*June 6, 2014*

**Chemistry**

At a temperature of 23.0 degrees celcius, and a pressure of 2.25 bar what volume would 23.0 g of a compound in the gaseous state with a molecular mass of 207 g/mol occupy?
*May 27, 2014*

**Chemistry HELP**

Why AgNO3 and Na2SO4
*May 26, 2014*

**Chemistry HELP**

you have 12.56 g of a mixture made up of sodium chloride and barium chloride. explain how you could use a precipitation reaction to determine how much of each compound the mixture contains
*May 26, 2014*

**Algebra**

3.33ft
*March 18, 2014*

**math**

A math problem in a workbook says to write a number sentence you could solve using these doubles. 35+35 The answer is supposed to be ____ + ____ = ____ What is the answer they are looking for???
*February 27, 2014*

**java programming**

P.S. I was able to import the file in the first class, but I'm stuck at step one on the second class
*February 17, 2014*

**java programming**

I have to make two classes, one is to import a file and display the integers in the file. The other class has to take the integers from the first class and use them to calculate things like the average, the highest, the total, and I am completely stumped...please help!!!
*February 17, 2014*

**Algrebra**

with a tailwind, a bird flew at a ground speed of 3 mi/h. Flying the same path against the same wind, the bird travels at a ground speed of 1.5 mi/h. What is the bird's air speed? What is the wind speed?
*January 21, 2014*

**Math**

1.5 hours
*November 20, 2013*

**Calculus**

The top and bottom margins of a poster are 2 cm and the side margins are each 4 cm. If the area of printed material on the poster is fixed at 386 square centimeters, find the dimensions of the poster with the smallest area.
*November 18, 2013*

**Computer Programming**

Implement the classic “Rock, Paper, and Scissors game” using following methods: Headers of the methods are shown public static void printMenu( ) It is a void method –It uses no parameters --It is called to display choices and code (1 for Rock, 2 for Paper, and 3...
*November 14, 2013*

**Calculus**

Consider the function f(x)=4(x-5)^(2/3). For this function, there are two important intervals: (-Inf, A) and (A, Inf) Where A is a critical number. Find A
*November 5, 2013*

**Calculus**

Consider the function f(x)=-2x^3+33x^2-108x+2. For this function, there are three important intervals: (-Inf,A], [A,B], [B,Inf) where A and B are the critical points. Find A and B and for each of the important intervals, tell whether f(x) is increasing or decreasing.
*October 29, 2013*

**math**

So the fish is moving 7 miles but falls back 5 miles each full day. 7-5= 2 25/2= 12.5 It would take the fish 12.5 days to move 25 miles.
*October 29, 2013*

**Calculus**

Find all numbers c that satisfy the conclusion of Rolle's Theorem for the following function. If there are multiple values, separate them with commas; enter N if there are no such values. f(x)= x^2-10x+3, [0,10]
*October 28, 2013*

**Calculus**

Evaluate the limit. as x approaches infinity, lim sqrt(x^2+6x+3)-x
*October 22, 2013*

**Calculus**

If f(x) = 2sin(5x)arcsin(x), find f'(x).
*October 21, 2013*

**Calculus**

Find the derivative of the function. g(x) = (e^x)/(3 + 3x)
*October 14, 2013*

**Calculus**

Let f(x) = 6sin(sin(x^5)). Find f'(x)
*October 9, 2013*

**Calculus**

Gravel is being dumped from a conveyor belt at a rate of 10 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 18 feet high? (Recall that ...
*October 9, 2013*

**Calculus**

The top of a 24 foot ladder, leaning against a vertical wall, is slipping down the wall at the rate of 4 feet per second. How fast is the bottom of the ladder sliding along the ground when the bottom of the ladder is 7 feet away from the base of the wall?
*October 8, 2013*

**Calculus**

Find the slope of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2 = 25(x^2-y^2) at point (-3,-1).
*October 8, 2013*

**Calculus**

A baseball diamond is a square with sides of length 90 ft. A batter hits the ball and runs toward first base with a speed of 21 ft/s. At what rate is his distance from second base changing when he is halfway to first base? At what rate is his distance from third base changing ...
*October 8, 2013*

**Calculus**

A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole.
*October 8, 2013*

**Economics**

1. The law of diminishing returns implies that at some output level: a) Marginal cost must fall b) Average total cost must diminish c) profit increases d) Marginal cost must rise e) Total cost must fall 2. The vertical distance between total cost curve and total variable cost ...
*September 30, 2013*

**math 4th grade**

Not sure what to do here? Naomi has 50 red beads and white beads. The number of red beads is 1 more than 6 times the number of white beads. How many red beads does Naomi have?
*September 19, 2013*

**algebra**

Thanks!
*September 19, 2013*

**algebra**

Naomi has 50 red beads and white beads. The number of red beads is 1 more than 6 times the number of white beads. How many red beads does Naomi have?
*September 19, 2013*

**math**

use the digits 3, 7, 1, 5 to write a number that rounds to each of the following; 2, , 3,500, 6,000, 7,400
*August 19, 2013*

**history**

what factors influenced the renaissance
*August 17, 2013*

**History**

Who are the amerindians
*August 17, 2013*

**History**

Give reasons why history is important
*August 15, 2013*

**math **

Find the difference between the sum of 378 and 401 and the product of 43 and 17
*June 30, 2013*

**mathematics**

Express this ratio in its simplest form $6:72
*June 30, 2013*

**Mathematics**

The nearest star to our solar system, is 4.3 light-years away Express this distance in miles in scientific notation
*June 29, 2013*

**Chemistry**

50.0 mL of 0.116 M NaOH is titrated with 0.0750 M HCl. Calculate the pH after the addition of 5.0 mL volume of acid.
*May 1, 2013*

**Science ASAP**

yeah i would agree with kaylin
*March 17, 2013*

**Math**

3n/(n2 -7n + 10) - 2n/(n2-8n+15) thanks
*March 14, 2013*

**Math Statistics**

The sorting algorithm known as bogosort can be described in pseudocode as: while not isSorted(input): shuffle(input) If we feed bogosort a shuffled array of length n of unique items the distribution of the number of times bogosort checks if the array is sorted (...
*February 23, 2013*

**Math**

In a computer lab there are two dierent printers. From 1pm-2pm Printer1 receives on average 12 print jobs and Printer2 receives on average 5 print jobs. Assume the number of print jobs requested on Printer1 and on Printer2 are independent of each other. (a) Defi ne random...
*February 23, 2013*

**physics**

Calculate the speed of a proton having a kinetic energy of 1.00 × 10^−19 J and a mass of 1.673 × 10^−27kg. Answer in units of m/s
*February 21, 2013*

**Chemistry**

You weigh out 1.20 g of sodium carbonate monohydrate, dissolve it in water and react it with 15.00 mL of 2.00 M HCl. Write an equation for the reaction and calculate the expected mass of carbon dioxide that will be produced.
*February 14, 2013*

**Chemistry**

How many moles of bromine are there in a 0.35 mL dichloromethane solution of 10% bromine? Density of Bromine = 3.10g/mL Density of dichloromethane = 1.33g/mL
*January 24, 2013*

**algebra**

tortious and hare race traveling at the same speed the tortoise finishes first. The toroise travels in a steady strate line begins at zero goes 32 miles in 50 minutes how would I write this in an equation
*January 7, 2013*

**math**

if I know the kinetic friction and the weight of the chair how do I find the force I need to push the chair ?
*December 27, 2012*

**physics**

A plane cruising at 251 m/s accelerates at25 m/s2 for 9 s.What is its final velocity?Answer in units of m/s
*December 17, 2012*

**Physics**

Use the equation Area = Volume / (velocity)x(time) Rearrange the equation to solve for velocity. So, (9.2x6.0x4.0) / (Pi)(0.19)^2(1080) So, the answer is 1.8m/s
*November 3, 2012*

**calculus **

g(x)= (((x-1)/x)-1)/((x-1)/x) Simplify and state the domain.
*October 29, 2012*

**math**

Chelsie saves 1/5 of her allowance and spends 2/3 of her allowance at the mall. What fraction of her allowance remains?
*October 22, 2012*

**Math**

There are 4 more girls in Mrs. Chang's class than Mr. Blackwell's class. Five girls moves from Mr. Chang's class to Mr. Blackwell's class. Now there are twice as many girls in Mr. Blackwell's class as there are in Mrs. Chang's. How many girls were in Mr...
*October 8, 2012*

**Maths**

42 divided by 7 = 6 1 unit=6 6*42=
*September 30, 2012*

**physics**

A hot-air balloon has just lifted off and is rising at the constant rate of 1.51 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 13.00 m/s. If the passenger is 2.68...
*September 8, 2012*

**physics**

A hot-air balloon has just lifted off and is rising at the constant rate of 1.51 m/s. Suddenly, one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 13.00 m/s. If the passenger is 2.68...
*September 8, 2012*

**physics**

In an action movie, the villain is rescued from the ocean by grabbing onto a ladder hanging from a helicopter. He is so intent on gripping the ladder that he lets go of his briefcase full of counterfeit money when he is 126.4 m above the water. If the briefcase hits the water ...
*September 7, 2012*

**Physics**

When the sun is 30.4 degrees above the horizon, you measure the shadow of a tree to be 52.9 meters long. How tall is the tree?
*September 7, 2012*

**Physics**

In the figure below, a spider is resting after starting to spin its web. The gravitational force on the spider is 0.167 N on the junction of the three strands of silk. The junction is supported by different tension forces in the two strands above it so that the resultant force...
*September 5, 2012*

**math**

Find the number of different groups that could be made using 11 people from a set of 30
*May 17, 2012*

**math**

write the following in compact form using factorials a. 38*37*36*35*34*33 b. 14!/19*18*17*16*15
*April 27, 2012*

**Science**

deer
*April 23, 2012*

**trig**

When does the period occur and the phase shift?
*April 22, 2012*

**trig**

2sec(3x-(pi/3)) Find the period.
*April 22, 2012*

**Math**

Factor over {complex numbers} 9x^2 + 49
*April 9, 2012*

**Math**

Solve x^2-6x+13=0
*April 7, 2012*

**Physics **

A 0.5kg puck traveling in a horizontal circle of radius 3.2m has a frequency of 0.5Hz. what is the centripetal force on the cord?
*April 2, 2012*

**math**

log32 8 = x no decimal approximations
*February 17, 2012*

**painting**

Write a 500- to 700-word summary that compares and contrasts Neoclassicism, Impressionism, and Abstract Expressionism. Use the selected artwork as your examples. Include the following in your discussion:
*January 29, 2012*

**physics**

vf = vi + at ? = 14 + 2.5(-9.8) vf = .571 vf^2 = vi^2 + 2ad (.571)^2 = (14)^2 + 2(-10)(d) 9.78
*January 11, 2012*

**calculus**

Water is leaking out of an inverted conical tank at a rate of 10,000 cm^3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 6 m and the diameter at the top is 4 m. If the water level is rising at a rate of 20 cm/min when the ...
*December 5, 2011*

**calculus**

Two people start from the same point. One walks east at 3 mi/h and the other walks northeast at 2 mi/h. How fast is the distance between the people changing after 15 minutes?
*December 5, 2011*

**Chemistry**

Dude Cody, your right it is annoying!
*November 19, 2011*

**Chemistry**

Reversible equilibrium: what would the effect be by adding hydrogen gas to: 3Fe(s)+4H20(i)<==>Fe3O4(s)+4H2(g) and... effect of adding chlorine gas to: P4(s)+6Cl2(g)<===>4PCl3(i)
*November 19, 2011*

**Chemistry**

Iron metal is produced from the ore iron(III) oxide by reacting the ore with gaseous carbon monoxide at high tempature to produce liquid iron metal and gaseous carbon dioxide. How do you balanced this equation for this reaction?
*November 19, 2011*

**Chemistry**

I am stumped on this one...Please help!!! Write a balanced base ionization reaction for methylamine (CH3NH2) in water. Identify all species as acids and bases and identify the conjuate acid-base pairs.
*November 19, 2011*

**english**

can you list specific nouns in the context of a sentence for which you need help
*November 17, 2011*

**SCIENCE **

suggest that you enter this question on Google; numerous sites appear from which you can choose regarding the history of sonar.
*November 17, 2011*

**Chemistry**

I've exhausted possibilities to find an isotope that has 42 protons and 44 neutrons; does one exist? Molybdenum has 42 protons ... but 54 neutrons so that isn't it. I'm hoping that Dr. Bob can figure this one out for me! You've been helpful with a prior ...
*November 17, 2011*

**math**

87 x 16 + 8 = 1,400 16ths There are 16 16ths in each whole number so 87 x 16 will give you 1392. Since you also have 1/2, you'll need to add one half of 16, which would be 8. Therefore, there is a total of 1,400 16ths in 87 1/2.
*November 16, 2011*

**math**

greatest quantity would be derived from 22 nines times 22 nines; therefore, use calculator to compute
*November 16, 2011*

**Math**

.625 is read as 625 thousandths; therefore the fraction would be 625 over 1,000
*November 16, 2011*

**Chemistry**

How much energy in kJ is required to raise a 1.75 kg block of gold from 25.0 C to 105.0 C? The specific heat of gold is 0.03083 cal/g C, but I don't know how to compute the answer to the question.
*November 16, 2011*

**math**

the only odd number between 75 and 87 with fewer than 3 ones is 81.
*November 9, 2011*

**Chemistry**

No idea lol
*October 16, 2011*

**math**

How do you find GCF (boomerang method)?
*October 11, 2011*

**math**

How do you find GCF (boomerang method)?
*October 11, 2011*

**7th grade math**

2d+5 how would i solve for this problem
*September 19, 2011*

**english**

What is the topic sentence? Nearly everyone is familiar with the dark silhouette of the giant saguaro, its arms thrust stiffly out. However, few people have actually seen this awe-inspiring plant in its natural habitat, since it is found only in the desert in the southwest ...
*June 1, 2011*

**trig**

How do I name the quadrand in which angle thada may lie if sec thada > 0 and tan thada > 0?
*May 22, 2011*

**Trig**

How do I find the quadrant in which angle thada may lie if cos thada > 0 and tan thada < 0?
*May 22, 2011*

**math**

how to solve sales tax
*May 5, 2011*

**probability**

explain the probabilty of one event in a fair game with three possible outcome
*May 3, 2011*

**physics**

How high above the earth’s surface would you have to be before your weight would be only 0.6 its current value?
*March 18, 2011*

**Physics**

.148
*March 15, 2011*

**Statistics**

The weights of adult males are normally distributed with a mean of 172 lb and a standard deviation of 29 lb Q.Find the weight that divides the upper 2% of weights from the lower 98%
*March 10, 2011*

**math**

the 2nd one is right
*March 8, 2011*