# Posts by Aurora

Total # Posts: 31

**Chemsitry**

Thank you!

**Chemsitry**

Check my work? What is the approximate pH of a 0.05 M solution of HSCN that has a Ka of 10-4? HSCN -> H+ + SCN- --------------------------- The equation for calculating pH is pH = -log [H+] Now we need to find H+ and solve. [HSCN] = 0.05 M the molarity Ka = [H+][SCN-]/[HSCN...

**Chemistry**

A ball bearing at 22.0 Celsius is dropped into a cup containing 250.0 g of water at 20.0 Celsius. The water and ball bearing come to a temperature of 30.0 Celsius. What is the heat capacity of the ball bearing in J/Celsius? How do I do this kind of question? I don't expect...

**Literacy**

I have to write a descriptive essay on a picture. I need to "show not tell." Help!

**Physics**

if there was a cyclone, would the speed of the wind make the waves go faster and make constructive interference occur?

**geography**

how does stormwater effect beach erosion/loss of sediment on shorelines?

**Math: Compounded Interest**

A principal of $200 is invested at 5% interest rate annually. Determine the future value in 3 months' time if compounded: (a) Semi-annually (b) Quarterly

**Physics**

Galileo’s law of falling bodies states that the rate of fall caused by gravity is the same for all objects, regardless of weight. This means that all objects have a free-falling acceleration of 9.8m/s2. However, a significant contradiction of this theory is the fact that ...

**Math**

1. Im in fourth grade and what im pemdas???????

**Math**

Which expression has a value of 199? A- 4 x 28 + 6 x 17 - 15 B- 4 x 17 + 6 x 28 - 38 C- 4 x 38 + 6 x 15 - 28 D- 4 x 15 + 6 x 38 - 88

**statiatics- central tendency**

The Frequency distribution of a histogram is the following scores: X F 1 1 2 1 3 2 4 1 1) what is the total area in the histogram? 2) what is half the area in the histogram? 3) Assume that the scores are measurements of a discrete variable. Find the median. 4) Assume the the ...

**Statistics**

The following are weights (in lbs) for a sample of 11 baby boys at the age of 18 months: 21.8 22.2 23.4 24.6 25.1 26.7 27.3 28.0 29.8 30.9 31.2 What is the 80th percentile estimate for these sample?

**Algebra**

repartir 152 entre A,B,C de modo que la parte de B sea 8 menos que el duplo de la de A y 32 mas que la de C

**Math**

Yes

**Math**

the base of a triangle is the same as the height. what least whole number measurement for the triangle so that the area would be greater than144^2

**Physics**

A car travels 20.2 km due north and then 31.3 km in a direction φ = 61.2◦ west of north. Find the magnitude of the car’s resultant displacement. Then Calculate the direction of the car’s resultant displacement, measured counterclockwise from the northerly ...

**Algebra**

Please help!!! im not sure what it is asking or how to answer it! In what situations would you use the mean to summarize a set of data? The median?

**algebra**

A Square Has A Side Length Of S . Write A Rule In Function Notation To Represent The Perimeter

**chemistry**

yes it it. 0.15%

**Math**

How many terms does a trinomial have?

**math withpizzazzi book c pg.C-14and 13**

what re the answe to these two mat riddles : whats wrong with getting a hair cut ? and what do you call it when a bunch of kids throw crayon and poster paint at ou

**physics**

A pendulum is 1.0 m long and is drawn aside 30.0* and let go. Find the velocity at the lowest point.

**keyboarding an word processing**

a (Blank) is a form of written communication that is used primarily for internal communication

**pre algebra**

60 -(6/1 +40/8)

**Science**

Why does NaCl dissolve in water but not in cooking oil? Thank you for explaining this.

**Science**

I am figuring out how much KCL will dissolve in 50 grams of water at sixty degrees, based on a graph. According to the graph, 45 grams of KCL can dissolve at 60 degrees. So I subtracted 45 from 50, and got five. The thing is my book said the answer should be between somewhere ...

**Science**

Why a match that has been lit will not re-light? please include the energy source in your answer.

**Calc**

1. Find values of a,b,c, and d such that g(x) = a(x^3)+b(x^2)+cx+d has a local maximum at (2,4) and a local minimum at (0,0) 2. Need someone to explain this. Graph a function f(x) for which: f(3)=f(5)=0 f'(x)<0 if x<4 f'(4)=0 f'(x)>0 if x>4 f"(x)&...

**Calculus**

I am unsure of how to take the derivative of this equation. It may be the exponents that are giving me trouble but I'm not sure exactly. Find the equation of the tangent line to the curve 4e^xy = 2x + y at point (0,4). On the left side, is the "xy" the exponent ...

**Calculus**

Find the equation of the tangent to the graph of f(x)=2x^4 (to the power of 4) that has slope 1. Derivative is 8 x^3. This equals 1 at x = 1/2. At this point the y-coordinate is f(1/2) = 1/8. The equation of the tangent line is thus: 1/8 + 1*(x-1/2) = x - 3/8 Thank you for ...

**Data Management**

Stuck with 2 questions. Need of assistance before tomorrow. Question 1. A summer camp has seven 4.6m canoes, ten 5.0m canoes, four 5.2m canoes, and four 6.1m canoes. Canoes are assigned randomly for campers going on a canoe trip. a) Show the probability distribution for the ...

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