Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 822

**Chemistry**

How calculate concentration by using molecular weight.

**Algebra 2**

Solve: (x-3)^2= -4

**Algebra 2**

Solve: (x-3)^2= -4

**Algebra 2**

How do I factor 4x+12??

**Chemistry**

A voltaic cell is based on the following two half reactions: Fe2+(aq) + 2 e¯ ---> Fe(s); Eo = -0.44 V Cu2+(aq) + 2 e¯ ---> Cu(s); Eo = +0.34 V When [Cu2+] = 0.0500 M, Ecell = + 0.80 V. What is the [Fe2+] for these conditions?

**Algebra II**

Find the radius and center of the circle which passes through the points (-2,3), (0,-3), (4,-3).

**Chemistry**

Which of the following is the strongest oxidizing agent in acidic solution? DATA: Ba2+(aq) + 2 e¯ ---> Ba(s); Eo = - 2.91 V Mn2+(aq) + 2 e¯ ---> Mn(s); Eo = - 1.18 V 2 H+(aq) + 2 e¯ ---> H2(g); Eo = 0.00 V Au3+(aq) + 3 e¯ ---> Au(s); Eo = + 1.50...

**Algebra 2**

Suppose you did a survey of male shoes size and the mean of that survey was size 10 with a standard deviation of 1.5. What is the z-score of a size of 7.5?

**Chemistry**

A few drops of AgNO3 is added to a sample of the unknown. A white precipitate appears. Which ion is present?

**Chemistry**

a piece of copper at 120 degrees celsius has exactly twice the mass of another piece of copper at 40 degrees celsius. The two pieces are brought together and allowed to reach equilibrium. What is the final temperature.

**Trigonometry**

2cos^2theta-3costheta+1=0 inerval [0,2Pi)

**Trigonometry**

2cos[x-pi/8]-sqrt2=0 Pi=3.141592654

**Trigonometry**

If tan theta= 3 and Pi<theta<3Pi/2, find cos theta. Pi=3.141592654

**Trigonometry**

Solve triangle ABC: B= 60 degrees, C= 90 degrees a= 4 feet

**Trigonometry**

Solve triangle SSA: A= 78 degrees, a= 30 b= 61

**Trigonometry**

Solvetriangle ABC: a= 12.2 c= 7.8 B= 63.5 degrees

**Calc**

How would you integrate 18x-33/√(3x^2-11x+6)

**Chemistry**

3) The chemical formula for ethylene glycol (antifreeze) is C2H6O2 and Isopropyle alcohol is C3H7OH. Calculate the new boining and freezing oints for 1000.0 g of aqueous solution (total volume), that is 30.0% solute (the antifreeze and the alcohol are the solutes). You will ca...

**Organic Chem**

what is the product when 2-methylbutanal is treated with cold base?

**Algebra**

A ball is hit straight up initially with the felocity of47 ft per second The height(h) of the softball in ft above ground after(t) seconds, Using the equasion H=-16 square + 47 T + 3. How long was the softball in the air before it hit the ground?

**math**

I have 2 draw a set of 12 circles:Color 5/12 of set blue, 1/3 of set red, &1/6 of set green. Not grasping the concept.

**Physics**

What is the acceleration of a proton moving with a speed of 4.3 m/s at right angles to a magnetic field of 2.1 T?

**math**

144 squared is rational right?

**Math**

Estimate to the nearest integer. Square root of 40.

**chem**

We can treat the equilibrium constant as the ratio of the forward rate constant, kfwd, with respect to the reverse rate constant, krev. That is: Keq = kfwd / krev. Which statement is true? a) kfwd > krev b) kfwd < krev The answer is A but how would you explain why that i...

**chemistry**

Initially, there are 33 moles of A and 0 moles of B. How many moles of A and B will be present after the system reaches equilibrium? a) 33 moles A; 0 moles B b) 0 moles A; 33 moles B c) 3 moles A; 30 moles B d) equal amounts of A and B The answer is given as "C" but ...

**organic chem**

(b) One of your illustrious colleagues continues his/her education and finally obtains employment with a renowned pharmaceutical company as an organic chemist. He or she is asked to synthesize pantothenic acid because the company wants to use it to prepare a synthetic form of ...

**organic chem**

(b) One of your illustrious colleagues continues his/her education and finally obtains employment with a renowned pharmaceutical company as an organic chemist. He or she is asked to synthesize pantothenic acid because the company wants to use it to prepare a synthetic form of ...

**chemistry**

The Kb for butylamine is 5.9x10^-4. What is the Ka for its corresponding conjugate acid, butylammonium? I really need help with this. I have no idea what to do. All I know is the equation to fine "Ka."

**PHYSICS help please**

40530 = 40% of 101325 This number equals the net force (N per Square meter). Area of door: Width x Height= 2x40530 = 81060

**calculus**

4(x*3)=2(x-4)+25

**finance**

You were hired as a consultant to Giambono Company, whose target capital structure is 40% debt, 15% preferred, and 45% common equity. The after-tax cost of debt is 6.00%, the cost of preferred is 7.50%, and the cost of retained earnings is 12.75%. The firm will not be issuing ...

**chemistry**

The standard enthalpy of formation for sulfur dioxide gas is -296.8 J. Calculate the amount of energy given off in kJ when 30.0 g of SO2 is fromed from its elements

**Finance**

I missed one day of class and now i cannot figure this out... I thought that price and YTM relied on each other and now I have a question asking to solve for each? An 11% semiannual bond matures in 7 years. The bond has a face value of $1,000 and a current yield of 10.76%. Wha...

**chemistry**

1. I'm not sure 2. "no reaction" 3. 2HBr(aq)+Sn(s) --> SnBr2(aq)+H2(g) 4. "no reaction" 5. "no reaction"

**Statistics and Probability**

Suppose you took 1000 random samples of size 200 from the Poisson distribution with u = 5 and computed a 90% confidence interval for each sample. Approximate the probability that at least 920 of these intervals would contain the mean value u = 5. Be sure to define any random v...

**math**

how do you fill in the table for y=1/2 (x-8)

**Statistics and Probability**

A research manager at Coca-Cola claims that the true proportion, p, of cola drinkers that prefer Coca-Cola over Pepsi is greater than 0.50. In a consumer taste test, 100 randomly selected people were given blind samples of Coca-Cola and Pepsi. 58 of these subjects preferred Co...

**Finance**

A firm has forecasted sales of $3,000 in April, $4,500 in May and $6,500 in June. All sales are on credit. 30% is collected the month of sale and the remainder the following month. What will be the balance in accounts receivable at the beginning of July

**Math**

10 times

**PHYSICS**

WHAT TYPE OF MIRRORS ARE USED IN A PERISCOPE(CONCAVE, CONVEX?) ALSO,DRAW A RAY DIAGRAM OF A PERISCOPE

**cis 115**

So what logic is used when pseudocoding compound conditions

**Geometry**

sXq 3.97 is lengith

**microbiology**

adjust ur scale and use E-ve numbers try using ln instead of logs dont be afriad to start ur graph later...instead of at 0 or 1

**math CA**

pay me 25$ and i will do it

**precalc**

N*p/100 good luck mate

**Statistics and Probability**

A computer supply house receives a large shipment of blank CDs each week. Past experience has shown that the number of flaws per CD can be described by the following probability distribution, where the random variable X represents the number of flaws per CD. x P(X = x) 0 0.65 ...

**Statistics and Probability**

Suppose that the proportion of students who used the Internet as their major resource for school in the past was 66%. A sample of 1000 students was taken and the number of students who used the Internet for their school during the past year was recorded. Let ��&#...

**Statistics and Probability**

Suppose that the proportion of students who used the Internet as their major resource for school in the past was 66%. A sample of 1000 students was taken and the number of students who used the Internet for their school during the past year was recorded. Let ��&#...

**Mathematics (Help? Please. )**

B= 180 - 87 B= 93 degrees.. :)

**math**

log3 (x^2-4) -log3 (x+2)=2 log3 [(x^2-4)/x+2)] = 2 log3 [(x+2)(x-2)/(x+2)] = 2 log3 (x-2) = 2 x-2 = 3^2 x = 11

**Mathematics**

um i think u wrote H and/or J wrongly but its either H/J.. u wrote the answer wrongly fully hope it helps

**physics**

11.54?

**physics**

A charge of .250 C moves vertically in a field of .500 T that is oriented some angle from the vertical. If the charges's speed is 2.0 x 10 ^2 m/s, what angle(s) will ensure that the force acting on the charge is 5.0 N?

**physics**

A charge of .250 C moves vertically in a field of .500 T that is oriented some angle from the vertical. If the charges's speed is 2.0 x 10 ^2 m/s, what angle(s) will ensure that the force acting on the charge is 5.0 N?

**Statistics and Probability**

Ok daddy :)

**Statistics and Probability**

Suppose a basketball player successfully makes 70% of the free throw shots they attempt. Let X represent the number of successful attempts in 120 independent attempted free throws. (A) What is the true probability distribution of X? (B) Find the mean and variance of the number...

**statistics and probability**

It is known that an exam scores of students in STAT 2507 follow a normal distribution with a mean of 70% and a standard deviation of 9%. (A) If a student must obtain a mark of 50% to pass the exam, what proportion of students fail the exam? (B) What is the probability that a r...

**statistics**

Suppose a basketball player successfully makes 70% of the free throw shots they attempt. Let X represent the number of successful attempts in 120 independent attempted free throws. (A) What is the true probability distribution of X? (B) Find the mean and variance of the number...

**Math/Finance**

A guy buys a car for $29,000 and finances it with a four year, 7% APR with monthly payments and compounding. How much of his third payment goes toward repaying principal?

**Finance**

A guy buys a car for $29,000 and finances it with a four year, 7% APR with monthly payments and compounding. How much of his third payment goes toward repaying principal?

**ALGEBRA**

Suppose that R is the set of real numbers. Let f: R--> R be defined by f(x)= mx+b, where m and b are real numbers and m is nonzero. Prove that f is a bijection.

**ALGEBRA**

Suppose that R is the set of real numbers. Let f: R--> R be defined by f(x)= mx+b, where m and b are real numbers and m is nonzero. Prove that f is a bijection.

**ALGEBRA**

Suppose that R is the set of real numbers. Let f: R--> R be defined by f(x)= mx+b, where m and b are real numbers and m is nonzero. Prove that f is a bijection.

**7th grade math worksheet **

Need help on how to actually do the rise/run and equations to figure out the anxwer to "What do you call a duck that steals?" worksheet. I can find the answer on your websight, but I need to show my work for numbers 1-6 using rise/run and numbers 7-18 using the equat...

**Physics**

What is the emf of a battery with a 0.15 Ω internal resistance if the battery delivers 1.5 A to an externally connected 5.0 Ω resistor?

**Math**

Is the answer (x-2)^2+(y-1)^2=40

**Math**

The point (-4.3) lies on a circle whose center is at (2,1). Find an equation of this circle.

**Math**

thanks for the help

**Math**

Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 11 hours of burning, a candle has a height of 18.6 centimeters. After 27 hours of burning, its height is 12.2 centimeters. What is the height o...

**Algebra**

I'm not sure I will look over my notes to see what I come up with.

**Algebra**

Sorry didn't see Reiny's post

**Algebra**

don't I need to put it in y= formula first?

**Algebra**

Graph the parabola x^2+8x-5y+21=0

**Algebra**

Thanks!

**Algebra**

Solve. (7+u)(3u-1)=0 (If there is more than one solution, separate them with commas.)

**finance**

Rob has $1,000 to invest for 120 days and is considering two options. Option 1: He can invest the money in a 120-day GIC paying simple interest of 4.48%. Option 2: He can invest the money in a 60-day GIC paying simple interest of 4.50% and then re-invest the maturity value int...

**Chemistry**

Thanks for your help; I am still have a few problems, could you check my work: Given: Volume of vinegar analyzed-5mL Con'c of NaOH-0.09890M Avg. Volume of NaOH from titration-43.75mL Density CH3COOH: 1.049g/mL Calculations: 1.Moles of NaOH required to reach equivalence poi...

**Chemistry**

Hi, could someone help me with these calculations for my lab; Given: Volume of vinegar analyzed:5 mL Con'c of NaOH: 0.09890M Avg. V of NaOH from titration:43.75 mL Moles of NaOH required to reach the equivalence point: ? Would this be (0.09890M)(0.04375L)=0.004327 moles Mo...

**Chemistry**

Please help with this question: B) Combustion analysis of a 22.0-mg sample of the painkiller morphine produced 13.2 mg of water. What is the % by mass of hydrogen in morphine?

**Chemistry**

Could someone help me with these problems; A)If 5.97mL of a solution of NaCl contains 2.54g of sodium ion, what is the molarity of the sodium chloride solution? -I know M=#moles solute/L but when I do this I get 7.28*10^-3 which is wrong, the answer should be 1.85*10^-2 B) Com...

**physics**

2m*sin(45)= length of fall (LOF) this needs to be plugged into equation henry posted. The suitcase does not fall 2m unimpeded. It slides down the ramp at 45 degrees. Thus trig is needed to solve.

**health**

How do you contract aids

**math**

I need a graph for y = 3 - 4cos pi/5(x - 1)

**termodynamic/phsics**

Hi! Can you explain how did you get this equation (mass flow rate)*DeltaT*(4.18 J/ C g)= 1000 J/s

**termodynamic/phsics**

i need more explanation

**termodynamic/phsics**

i still need help plz

**termodynamic/phsics**

i still need help plz

**termodynamic/phsics**

What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If there is a water flow of 500 g / minute to a solar panel on one m2, how much water is heated up under optimal conditions during the passage of the col...

**Organic CHEM**

What is the whole point of using solvent pairs for recrystallization(say a mix of ethanol and water) rather than just using one or the other? -I know that you use solvent pairs when you solute won't dissolve in either pure water or pure ethanol, but then if the solute won&...

**AP CALCULUS PLEASE HELP DUE TOMORROW!**

5. What are the dimensions of the lightest open-top right circular cylindrical can that will hold a volume of .8L?

**CALC**

Awesome thank you :)

**CALC**

Oh I see thank you but the new bounds after you have changed the order shouldn't it be x= log(y)to 4 --> because I rearranged the bounds from y=e^x to x=log(y)?

**CALC**

I just need help with changing the order of integration. I can do the actually integral by myself. Thank you :) int f(x,y) dydx where y bounds= 1 to e^x and x bounds= 0 to 4 I thought the new bounds were int f(x,y) dxdy x= 0 to log(y) y= 1 to e^4 Please let me know if I'm ...

**Chem**

Melissa you should probably just ask Mr Earls because apparently anyone doing the question has no idea what to do

**algebra**

I think it is looking for a vocab word but not sure What do you think

**algebra**

Functions of the same famil have the same... (?) Can someone help with the answer??

**Chemistry**

How many moles are in 1.64 g hclo

**Chemistry2**

Well I'm trying to figure out the chemical equation

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