# d4nte

### Convert Complex Numbers to Rectangular Form.?

How do I continue with 8a? I stopped at 2(cos(pi/4)+isin(pi/4)). But then, I dont understand how to continue afterward.

5 AnswersMathematics11 months ago### Surface Area of Revolution Question?

1 AnswerMathematics11 months ago### Finding the smallest value of N for a Series?

1 AnswerMathematics12 months ago### Sequence Question?

1 AnswerMathematics1 year ago### Sequence question regarding thereom?

How do I even start to go about this? I think it is saying that a sequence converges to a certain number for a given variable. Therefore, a sequence converging to the "L" will have less of the given variable for a specific number?

1 AnswerMathematics1 year ago### Error Bound, Simpson's RUle?

I keep getting it wrong for some reason. I'm pretty sure that I got it correctly.

1 AnswerMathematics1 year ago### How do I go about this?

1 AnswerChemistry1 year ago### Midpoint and Trapezoidal Rule?

2 AnswersMathematics1 year ago### Percent by mass chemistry?

4.79 g of a mixture of NaNO3 and Na2SO4 contains 1.41 g of sodium. What is the percent by mass of NaNO3 in the mixture?

1 AnswerChemistry1 year ago### Hyperbolic Integrals?

1 AnswerMathematics1 year ago### Area between two curves?

Find the area of the region enclosed by the graphs of:

𝑦=(21𝑥)/(𝑥^2+1)

and

𝑦=(21𝑥)/5.

1 AnswerMathematics1 year ago### Area between two curves question?

Find the area of the region lying to the right of 𝑥=2𝑦^2−3 and to the left of 𝑥=177−3𝑦^2.

2 AnswersMathematics1 year ago### Electron Charge to Mass Ratio Problem?

In a fictitious world the Thomson cathode ray experiments found the electron charge to mass ratio to be 7.13×106 C/g. A series of oil drops in the Milikan oil drop experiment were found to have excess charges of 3.50×10-19 C, 4.37×10-19 C and 2.62×10-19 C. What could be the mass of an electron?

1 AnswerChemistry1 year ago### Taylor Series Question?

The Taylor series for f about x=1 for a certain function f converges to f(x) for all x in the interval of converge. The nth derivative tangent line at x=1 is given by f^(n)(1) = ((-1)^(n)(n)!)/(2^(n+1)(n+1)^2) for n (less than or equal to) 2. The graph has a horizontal tangent line at x=1, and f(1)=4

Find the radius of convergence of the Taylor series for f about x=1.

1 AnswerMathematics2 years ago### chemistry question?

The gram solubility of magnesium hydroxide is 4.1x10 -3 gram per liter at 25C.

(a) Write a balanced equation for the solubility equilibrium.

(b) Write the expression for the solubility product constant, K sp , and calculate its value.

(c) Calculate the pH of a saturated solution of Mg(OH) 2 at 25C.

1 AnswerChemistry2 years ago### Chemistry Question?

Solve the following problem: Ag 2 CrO 4 (s) <-> 2 Ag +1 (aq) + CrO 4 -2 (aq) Ksp = 2.0x10 -12

(a) How many grams of silver chromate can be dissolved in 150 milliliters of water?

(b) Show how the addition of hydroxide ion can cause an increase in the solubility of the silver chromate.

Using chemical reaction(s) would be key to answering this question.

(c) Beyond classifying the compound as being ionic, how can you specifically classify how the silver (I) ion

and the hydroxide act in this system? Briefly explain.

1 AnswerChemistry2 years ago### chemistry question?

In each of the following, (a) write the reaction/equilibrium occurring and (b) show all work necessary to

solve for the pH:

(a) Find the pH of a solution containing 150.0 ml of 0.25 M Nitrous Acid (HNO 2 ; Ka = 4.5E-4)

(b) Find the pH of a solution of 1.73 g sodium nitrite (NaNO 2 ) added to 125 ml of water. Assume

that when the solid is added, there is no appreciable change in volume.

(c) Find the pH of the resulting solution when the solutions of part (a) and (b) are added together.

(c1) Explain why the pH of the nitrous acid changes upon the addition of the sodium nitrite.

(d) Find the pH when 0.80 g NaOH is added to the solution in part (c). Assume that when the

solid is added, there is no appreciable change in volume.

(e) Find the pH when 10.0 ml of 0.50 M hydrochloric acid is added to part (d).

1 AnswerChemistry2 years ago