Thursday

July 30, 2015

July 30, 2015

Total # Posts: 2,989

**Physics**

A swimmer, capable of swimming at a speed of 1.44 m/s in still water (i.e., the swimmer can swim with a speed of 1.44 m/s relative to the water), starts to swim directly across a 2.21-km-wide river. However, the current is 0.840 m/s, and it carries the swimmer downstream. (a) ...
*September 28, 2014*

**physics**

A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 118 km away. The radar antenna is pointing upward at an angle of 58.2 ° above the ground. Find (a) the x and (b) the y components (in km) of the ...
*September 28, 2014*

**Abstract Algebra**

If G is a group with exactly 66 elements of order 14, how many subgroups of order 14 does G have?
*September 26, 2014*

**math problem (please help)**

d. (f+g)(x)=f(x)+g(x), just add the two polynomials together. you'll get 5x^2-x-4
*September 26, 2014*

**math problem (please help)**

switch your x and y like original : y=(7x-8)/(x-1) to: x=(7y-8)/(y-1) and solve for y. so: xy-1=7y-8=> xy-7y=-7=> y(x-7)=-7 => y=-7/(x-7)
*September 26, 2014*

**statistics**

The 92 million Americans of age 50 and over control 50% of all discretionary income (AARP Bulletin, March 2008). AARP estimated that the average annual expenditure on restaurants and carry out food was $1873 for individuals in this age group. Suppose this estimate is based on ...
*September 26, 2014*

**Chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400mL of a solution that has a concentration of Na+ ions of 1.10M ?
*September 24, 2014*

**Metric Spaces Proof**

d(x,y)={ 1 if x does not equal y 0 if x=y Prove that d satisfies the axioms of a metric. clearly it satisfies d(x,y) existing in the reals, and d(x,y)>=0 and d(x,y)=0 iff x=y. why I don't know is triangle inequality and d(x,y)=d(y,x).
*September 24, 2014*

**Math Proof**

On the real line, define d (x, y ) = sqrt(abs(x − y)) . Prove that d satisfies the axioms of a metric.
*September 24, 2014*

**math**

I wasnt given any
*September 24, 2014*

**math**

What is the domain and range of ln(4-x-y)
*September 24, 2014*

**math**

I am number less than 10. When I am divided by 2, half of that number is also 2. what number am I?
*September 21, 2014*

**Physics**

A relativistic proton has a momentum of 1.0×10^-17 kg ∙ m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mass of proton = 1.67 × 10-27 kg)
*September 21, 2014*

**physics**

A car travels along a straight stretch of road. It proceeds for 11.4 mi at 57 mi/h, then 21.8 mi at 43 mi/h, and finally 30.8 mi at 32.6 mi/h. What is the car’s average velocity during the entire trip?
*September 20, 2014*

**math**

I am a whole number. when you add 3 to me you get a 2-digit number. The 2-digit number is the same as 3 four times. What number am I?
*September 18, 2014*

**Physics**

1. A cannon mounted on the back of a ship fires a 50.0 kg cannonball in the horizontal direction at a speed of 150 m/s. If the cannon and ship to which it is firmly attached have a mass of 4.00 x 103 kg and are initially at rest, what is the speed of the ship just after ...
*September 18, 2014*

**math**

Write an equation relating the number of questions I get right on a test to the total score I will get if the test has 20 questions each with the same point value and the test is worth 100 points total. I know each question is worth 5 points so I would think that N (number ...
*September 17, 2014*

**MATH**

4X/5+1/7=8
*September 16, 2014*

**Math Proof:**

Can you say: Since x in E then E is not empty and is a subset of the reals. Since there exist and x in E where a<x then a is a lower bound of E. then let lambda be a different lower bound in E then let a precede lambda. this can't occur because we stated that a is a ...
*September 16, 2014*

**Math Proof:**

Let a,b exist in the reals with a<b. (i) for the open interval E=(a,b), prove that infE=a and supE=b. (ii) for the closed interval F=[a,b], prove that the infF=a and infF=b.
*September 16, 2014*

**Math Proof**

Prove: Let a,b exist in the reals with a<b, (i) For the open interval E=(a,b) prove that the inf E=a and sup E=b (ii) for the closed interval F=[a,b], prove that inf F=a and sup F=b.
*September 15, 2014*

**Math Proof**

Find a rational number and an irrational number between x=8.9949926 and y=8.995
*September 13, 2014*

**chemistry**

The typical person needs a 2000 calorie diet to sustain “normal” activity. Nowadays, a lot of the energy in American diet comes from fats and sugars. Assume that “fats” provide 9.0 calories per gram and sugars (treat as glucose) provide 4.5 calories per ...
*September 13, 2014*

**Numerical Analysis**

Consider the equation 8x^4 − 12x^3 + 6x^2 − x = 0. For each of the two solutions x = 0 and x = 1/2, decide whether the Bisection Method or Newton’s method will converge faster (say to eight place accuracy), without running the calculation. I don't ...
*September 12, 2014*

**Math Proof**

Let S be a non-empty subset of the real numbers that is bounded below. Define −S by −S = {− x | x ∈S }. Prove: (i) −S is bounded above. (ii) sup(−S) = − inf S .
*September 10, 2014*

**Math**

What's the question asking you to do? Because if it just the two sides equal then you are missing a 2
*September 10, 2014*

**Calculus**

Determine the exact values of the six trigonometric functions of the angle.(-5,-2)
*September 8, 2014*

**Math Proof**

Prove: let alpha be a lower bound of a subset E of an ordered set S. If alpha exist in E, then alpha= infE(greatest lower bound of E). PF: Already have alpha is a lower bound of E. Let lambda be a different lower bound of E. If alpha precedes lambda, the lambda will not be a ...
*September 8, 2014*

**Math Proof**

Thank you! Could you also factor sqrt(12) to be 2sqrt(3) and prove sqrt(3) to be irrational by assuming rational?
*September 8, 2014*

**Math Proof**

Prove that square root of 12 is irrational. **I don't know if I did this correctly PF: By contrapositive, assume sqrt(12) is rational. Then there exist an a,b as integers such that a/b is written in the lowest terms, and sqrt(12)=a/b. Then by squaring both sides, 12=a^2/b^...
*September 8, 2014*

**Math Proof**

Thank you!
*September 8, 2014*

**Math Proof**

If c is rational, c does not = 0, and x is irrational, then cx and c+x are irrational.
*September 8, 2014*

**child care**

Which one of the following statements about childcare centers is correct? A. Childcare centers are automatically enrolled in a QRIS system when they apply to be licensed. B. Childcare centers are mandated by law to enroll in a QRIS system. C. Childcare centers voluntarily ...
*September 7, 2014*

**child care**

Any business, including a child care facility, must obtain an Employer Identification Number (EIN) to establish its business tax accounts. The EIN is assigned by the A. Internal Revenue Service (IRS). B. local Chamber of Commerce. C. State Department of Education. D. National ...
*September 7, 2014*

**Numerical Analysis**

use a graph, or guess and then confirm a bracket, or tabulate f(x) on a wide interval to figure the bracket of length one. to find an interval of length 1 that contains a root of the equation 3x^3 +x^2=x+5. I don't understand what to do
*September 2, 2014*

**college algebra**

question 1: build the fraction x+5/x+3 to an equivalent fraction whoes denominator is x^2 question 2: simplify (x^2+6x+9)(3-x)/(x-3)(2x+6) question 3. find the product in simplest from x^3-9x/x^5+27x^2 * x^2-3x+9/x^2+3x
*September 2, 2014*

**Math**

P(2 white or 2 Blue)=P(2 white)+ p(2 blue)= 2/24 + 2/6=5/12
*September 1, 2014*

**Math Proof**

Thank you
*September 1, 2014*

**Math Proof**

How would I write that though, since epsilon has to be greater than 0 and abs(x-y) has to be less than epsilon. would i suppose that x doesn't equal y, then epsilon <0.. then epsilon is less than abs(x-y)/2, then abs(x-y)<epsilon<abs(x-y)/2. which contradicts abs(...
*September 1, 2014*

**Math Proof**

Okay, so since epsilon has to be the smallest number passible x has to equal y.
*September 1, 2014*

**Math Proof**

I know that if x=y, for any epsilon>0, abs(x-y)=0<epsilon
*September 1, 2014*

**Math Proof**

I'm still not seeing it. I have not used epsilon before today
*September 1, 2014*

**Math Proof**

I honestly have no clue how to even start this proof. Other than assume x=y and then assume that abs(x-y)<epsilon
*September 1, 2014*

**Math Proof**

Let x and y be real numbers. Then x=y if and only if abs(x-y)< epsilon for every epsilon>0
*September 1, 2014*

**Math Proof**

Prove that for all integers n > or = 1 and all real numbers x subscript 1, x subscript 2,...., x subscript n. absolute value of (x subscript 1+ x subscript 2+...+ x subscript n) <or= abs(x subscript 1) + abs( x subscript 2)+..+ abs(x subscript n) I know how to do the ...
*September 1, 2014*

**college algebra**

1. divide and simplify x^2+x-56/x^1-1 / x-7/2x+2 2. find the product in simplest from for x^2+x-6/2x^2-x-3 * x^7-2x^6+4x^5/x^4+8x 3. perform the indicated operations and simplify: 2/3x +4/3x^2 y^4 -6/2x^4 y^5 4. perform the indicated operation and simplify x/x-1 + 2x+3/x^2-1 5...
*September 1, 2014*

**geography**

Who is Jane Goodal?
*August 30, 2014*

**Math**

And I did understand that 9 is greater than 7 9+7=16,97 is the answer
*August 25, 2014*

**Math**

That's pretty harsh, and I meant to type 97 but, still that was soooooooooo harsh!!!!!
*August 25, 2014*

**Math**

I don't know
*August 25, 2014*

**Math**

Is 79 correct?
*August 25, 2014*

**Math**

My sister said it was 79 but I don't understand how she got that answer
*August 25, 2014*

**Math**

I'm not sure then
*August 25, 2014*

**Math**

Is it 39
*August 25, 2014*

**Math**

I am a number less than 40. One of my factors is 3. The sum of my digits is 12. What number am I?
*August 25, 2014*

**Basic Physics**

Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 41m above that pipe.
*August 25, 2014*

**Physics**

What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.88m tall person standing vertically?
*August 25, 2014*

**math**

Thank you I got it....so helpful
*August 7, 2014*

**math**

Oops wrong question I meant to ask When she started saving money, 203 shopping days were left until Christmas. How much money was in her account at Christmas?
*August 7, 2014*

**math**

How much was in her account four weeks after she began saving?
*August 7, 2014*

**math**

I have to find the equation of the line, but I need the expression to solve it.
*August 7, 2014*

**math**

I was trying to find the expression for the problem
*August 7, 2014*

**math**

At the beginning of the summer molly decided to add a little money into her sayings account every week. After seven weeks her account had $175. At the end of 15 weeks her account had $375. Assume that she put the same amount of money into her account every week and will ...
*August 7, 2014*

**Math**

A standard deck of playing cards is shuffled and three people each choose a card. Find the probability that the first two cards chosen are clubs and the third card is black if the cards are chosen with replacement, and if the cards are chosen without replacement.
*July 14, 2014*

**Geometry**

Tan x=(100/50) so X= Tan^-1(100/50), you have to use the inverse of tan therefore, x=63.435
*July 10, 2014*

**US Government**

The answer is True
*July 9, 2014*

**Set Theory: Sideways U with a line under it**

I know the sideways U means "is a subset of" and if there is a line under it, it means "is equal to" I have two sets: {-3,0,3} _____ {-3,-1,1,3} choose the correct symbol a. sideways U with line under it and slash through it b. sideways U with line under it...
*July 6, 2014*

**Set Theory :Complements with Ellipses **

Let U= {1,2,3, . . .}, A= {1, 2, 3, . . . ., 39}. use the roster method to write the set A' Find A' = _____________________________________________ I understand how complements work. Complement A' is everything outside of set A. However, since U goes on infinitely ...
*July 5, 2014*

**math: set theory **

{X|X E N and x greater than or equal to 4} This is a set theory problem: | = means such that is E = is a symbol used to replace the words "is an element of" N= represents all natural numbers answer choices are: a) {5,6,7,...,100} b) {5,6,7,...} c) {4,5,6} d) {4,5,6...
*July 4, 2014*

**English 2b**

What is the definition of a hook? a. a topic sentence that states the main point b. an elaborating sentence that provide details or facts c. an enticing statement that grabs the reader’s interest d. an extension sentence that restates or clarifies the topic sentence
*July 1, 2014*

**English 2b**

Read the paragraph. The snow began falling early in the morning. Tiny, weightless crystals. By early afternoon, the ground was covered with several inches of snow. Snow flurries continued throughout the day. When the evening came, the snow was still falling. At least a foot ...
*July 1, 2014*

**Physics**

Is there normal contact force on a frictionless surface?
*June 28, 2014*

**Physics**

What happens when we bring a mercury barometer to the moon?
*June 28, 2014*

**Physics**

What happens to potential energy during melting
*June 27, 2014*

**Physics**

A motorcycle is travelling at a constant acceleration in a straight line. When it passes by the first lamp post, it is travelling at 10ms-1. When is passes by the next lamp post which is 200m from the first lamp post, the motor cycle is travelling at 16 ms-1. What is the ...
*June 27, 2014*

**Chemistry **

What is the reaction between mno4- and c2o42- and is there a colour change in this reaction?
*June 26, 2014*

**math**

C.
*June 6, 2014*

**Physics**

A soccer ball is kicked with a speed of 9.95m/s at an angle of 35.0∘ above the horizontal.If the ball lands at the same level from which it was kicked, how long was it in the air?
*June 4, 2014*

**helppppp math helppp!**

292,559
*June 1, 2014*

**Physics**

A batter hits a ball and it is caught 4 seconds later 100 meters from home plate. What is the initial velocity of the ball?
*May 28, 2014*

**Math: Linear Equation**

thank you so much!!
*May 20, 2014*

**Math: Linear Equation**

An assignment with 3 of these problems was assigned to my class and we haven't learned it yet. I don't know when our professor plans on covering it but I'd like to finish my homework.
*May 20, 2014*

**Math: Linear Equation **

I have not learned this yet in class and I am stuck on this homework problem. Graph the linear equation by using a table of solutions. 3x-4y=12
*May 20, 2014*

**chemisty**

calculate the H+ for green tea with a pH of 7.9
*May 14, 2014*

**chemistry**

calculate the mass percent of the following solutions 1.25 g CaCL2 in 35.0 g H2O I am not sure if i have the correct set up (1.25g CaCl2/1.25 g CaCl2 + 35.0 g H20)*100
*May 14, 2014*

**college chemistry**

if 75 g of ice at 0.0 degrees C were added to 1.5 L of water at 75 degrees C what would be the final temperature of the mixture
*May 13, 2014*

**chemistry**

I got the molecular formula is NaHCO3+H2SO4=Na2SO4+CO2+H2CO3 and i got the total ionic formula is NaOH+H2CO2(aq)= Na2CO3 + HOH but i am having trouble finding the net ionic formula can you please help me thank you
*May 13, 2014*

**Catering**

Guidelines to formal etiquette quite clearly stipulate that? A. corn on the cob should be eaten with a knife and fork. B. asparagus spears should be eaten with the fingers. C. eating a canapé directly from a server's tray is permissible. D. bread should always be ...
*May 6, 2014*

**Chemistry**

If you dissolve 13.5 g of malic acid, C4H6O5, in half a liter of water (0.500 L), what is the molarity of the acid in the solution?
*May 4, 2014*

**Accounting Questions**

Ugh. This class. Does anyone have the answers?
*May 3, 2014*

**chem**

calculate the density of each of the following gases: a)NH3 at 25 Degrees Celsius and 1.2 atm b)Ar at 75 Degrees Celsius and 745 torr
*April 29, 2014*

**college chem**

A mixture contains H2 at 600 torr pressure, N2 at 200 torr pressure and O2 at 300 pressure. what is the total pressure of the gases in the system?
*April 29, 2014*

**Engineering**

Three resistors , 50 ohms, 100 ohms, and r3 are connected in a series to a power source with potential difference 48 volts and a current throughout the circuit. Can anyone help me figure out what r3 is ?
*April 29, 2014*

**college chem**

A sample of O2 gas was collected over water at 23 degrees celsius and 772 torr. what is the partial pressure of the O2?
*April 29, 2014*

**college chem**

a sample of a gas occupies a volume of 1025 mL at 75 degrees Celsius and 0.75 atm. What will be the new volume if temperature decreases to 35 degrees Celsius and pressure increases to 1.25 atm
*April 29, 2014*

**college chem**

A sample of methane gas CH4, occupies a volume (L) of 58.2 L at a pressure of 7.25 atm. What volume will the gas occupy if the pressure is lowered to 2.03 atm
*April 29, 2014*

**pipe fitter test certification**

Please Help!...I am in need of a study guide for my pipefitters test, or an outline of what's on the test. Unfortunately I am not able to take the class available. PLEASE if you know of one or where one would be available. Any information will be greatly appreciated and a ...
*April 28, 2014*

**Chemistry**

What is the specific heat of an unknown substance if a 2.45g samples releases 12.9 cal as its temperature changes from 25.1 degrees C to 20.1 degrees C?
*April 27, 2014*