Tuesday
July 29, 2014

Posts by Amanda


Total # Posts: 1,694

Chemistry
When 7 mL of a solution containing 4 M KNO3 is diluted to 23 mL, a dilute solution is formed. What is the NO3- concentration in 15 mL of the dilute solution?

pre-calc
simplfy the expression by double angle formula or a half angle formula. cos^2(x/2)-sin^2(x/2) 2sin(x/2)cos(x/2)

Per-calc Helppppp
find: tanx=-3 one period and all angles 3csc^2x=4 one period and all angles sin2x+cosx-0 one period

Per-calc Helppppp
keep in mind answers should be pi radians or if necessary 3 dec. csc^2-2=0 all angles 4cos^2x-4cosx+1=0 all angles and name 8 angles 7sin^2x-22sinx+3=0 all angles and name 8 angles 2cos^2x-7cosx=-3 all angles sinx(2sinx+1)=0 all angles

Pre-Calc Help!!!!!!!!
cos(2tan^-1(15/8))

Pre-Calc Help!!!!!!!!
1+sin2x/sin2x=1+1/2(secx)(cscx)

Pre-Calc Help!!!!!!!!
Evaluate the expression under the given conditions. sin (A+B); tan A= 12/5, A in quadrant 3, sin B= -3sqrt(10)/10, B in quadrant 4.

English
I have an test on these and I do not want to fall the test. Please tell me a ways I can study, online tests etc so that I can pass it. Thank you and I appreciate for your help! They are: They will be fill in the blanks, multiply choices. (1)Petroleum (2) Solar Energy resources...

DrBob222
Thank you sooooooooo much!!!!!!

Chem-Help Please!!!
a correction needs to be made to the calculations for real gases as compared to ideal gases. apply these corrections and calculate the real pressure expected for 5 mole of nitrogen in a 1.5L container at a temp. of 20C. Note: I tried to find right formula for this but couldnt....

statistics
The ages (in years) of 10 infants and the number of hours each slept in a day Age, x: 0.1, 0.2, 0.4, 0.7, 0.6, 0.9, 0.1, 0.2, 0.4, 0.9 Hours slept, y: 14.9, 14.5, 13.9, 14.1, 13.9, 13.7, 14.3, 13.9, 14.0, 14.1 Find the equation of the regression line. Then use the regression e...

HISTORY PLEASE HELP!
I had put b on my test and it was incorrect. A friend out e and got it right. Not sure why though sorry.

Pre-Calc Help!!!!!!!!
Evaluate the expression under the given conditions. sin2(theta), sin(theta)=1/7(theta) in Q2

Pre-Calc Help!!!
Find sin x/2, cos x/2, and tan x/2 from the given information. cos x=− 4/5, 180° < x < 270° sin(x/2= cos(x/2)= tan(x/2)=

Pre-Calc Help!!!
Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. Sqrt(1-cos50/2)

Chemistry!!!!!!
a compound is analysed and found to have the atomic composition of C 54.5454% H 9.0909 % o 36.3636%. at a temp. of 120C and a pressure of 608 mm the density is 2.183 g/L. what is its molecular formula.

Chemistry!!!!!!
a correction needs to be made to the calculations for real gases as compared to ideal gases. apply these corrections and calculate the real pressure expected for 5 mole of nitrogen in a 1.5L container at a temp. of 20C.

Chemistry :((((
a gas occupies a volume of 5L at a temp. of 20C and a pressure of 1atm. what volume would it occupy at a temp. of 30C and a pressure of 1.1 atm.

trig
solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta

Chemisty Help!!!!!!!!
show how you would obtain (the orbitals used) and the possible types (the orbitals produced) for hybridization of a carbon atom. you must report the shape and the number of orbitals of each type used and produced for each type of hybridization.

chemistry
How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?

chemistry
How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?

Finite Math
In a carnival game, the player selects two coins from a bag containing four silver dollars and twelve slugs. (a) Write down the probability distribution for the winnings. (b) Determine how much the player would have to pay so that he would break even, on the average, over many...

Finite Math
An urn contains sixteen red balls and seventeen white balls. A sample of three balls is selected at random and the number of red balls observed. Determine the probability distribution for this experiment: Number of Red Balls/Probability 0...Probability=? 1...Probability=? 2......

Statistics
The ages (in years) of 10 infants and the number of hours each slept in a day Age, x: 0.1, 0.2, 0.4, 0.7, 0.6, 0.9, 0.1, 0.2, 0.4, 0.9 Hours slept, y: 14.9, 14.5, 13.9, 14.1, 13.9, 13.7, 14.3, 13.9, 14.0, 14.1 Find the equation of the regression line. Then use the regression e...

Chemistry
A calorimeter contains 22.0 mL of water at 14.0 C. When 2.50 g of X (a substance with a molar mass of 66.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)--------> X(aq) and the temperature of the solution increases to 25.5 C. Calculate the enthalpy change, Delt...

Chemistry
According to the following reaction, how much energy is evolved during the reaction of 32.5g B2H6 and 72.5g Cl2? The molar mass of B2H6 is 27.67g/mol. B2H6(g)+6Cl2(g)----->2BCl3(g)+HCl(g) Delta H reaction=-1396

Microbiology
Why can Enterotube II System be used to identify only gram-ngative, oxidase negative Enterobacteriaceae?

Microbiology
What organic molecule is necessary to detect mixed acid fermentation by bacteria? (IMViC Tests)

Physics
You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 36m above the surface of the lake. You dive off the cliff doing somersaults so as to have an angular speed of 6rev/min. How many revolutions do you make before you hit the water?...

English
Ok so i understand exository but can you please simplify literary for me

English
Ok so expository gives you a topic right

English
I have starr test in the morning can somebody please explain what the difference between literary and expository writing

reading
describ the settings of the text physically and socially and historically. fron the book the red scarf girl

Chemistry
How many mL of 5.5 M KOH are needed to prepare 300 mL of 0.2 M KOH?

Chemistry
How do you prepare a 0.4 M soultion of copper sulfate in water starting with solid copper sulfate and water?

Chemistry
I don't get this at all. A beaker with 105mL of an acetic acid buffer with a pH of 5.00 is sitting on a bench top. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.40 mL of a 0.470 M HCl solution to the beaker. How much will the pH ...

SCI207: Dependence of Man on the Environment
Give specific examples of at least two (2) production and two (2) consumption habits humans have related to material resources.

Economics
The market demand in a Bertrand duopoly is P = 15 - 4Q, and the marginal costs are $3. Fixed costs are zero for both firms. Which of the following statement(s) is/are true? a.P = $3. b.P = $10. c. P = $15. d. None of the statements associated with this question are correct. I...

algebra 2
the area of a square is numerically 165 more than the perimeter. find the length of the side

algebra 2
the height of a box is 6 inches. the length is three inches more than the width. find the width if the volume is 240 cubic inches

algebra 2
two cars leave an intersection. one car travels north; the other east. when the car traveling north had gone 15 miles, the distance between the cars was 5 mile more than the distance traveled by the car heading east.how far had the east bound car traveled?

algebra 2
a ladder is resting against a wall. the top of the ladder touches the wall at a height of 6 feet. find the length of the ladder if the lenght is 2 feet more than its distance from the wall.

algebra 2
the printed matter on a 10 by 16 centimeter page of a book must cover 0 square centinmeters. if all margins are to be the sme width, how wide should they be?

algebra 2
a triangluar garden has an area of 189 square feet. its height os 3 feet more than ots base. find the measure of the base.

Finite Math
help me this is the one problem I just cannot seem to figure out!! Without consultation, each of five organizations announces a one-day convention to be held during July. Find the probability that at least two organizations specify the same day for their convention.

Finite Math
i want help understanding how to solve the problems, not just the answers. I understand how to get the denominator, by getting the total and nCr the sample, but i cannot figure out the numerator when it comes to solving these probability problems.

Finite Math
A law firm has thirteen senior and nine junior partners. A committee of 6 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?

Finite Math
Without consultation, each of five organizations announces a one-day convention to be held during July. Find the probability that at least two organizations specify the same day for their convention.

Finite Math
C (14,8) = 3003 C (26,8) = 1562275 1562275 - 3003 = 1559272 ANSWER= 1559272/1562275 (cannot be simplified)

Finite Math
A factory produces fuses, which are packaged in boxes of 26. Eight fuses are selected at random from each box for inspection. The box is rejected if at least one of these eight fuses is defective. What is the probability that a box containing twelve defective fuses will be rej...

Finite Math
Eight white socks and four red socks are in a drawer. If two socks are selected at random, what is the probability that both socks are the same color?

algebra 2
Factor the difference of two cubes: 5x^4y^2-40xy^5

Finite Math
An urn contains six red balls and five white balls. A sample of 2 balls is selected at random from the urn. What is the probability that at least one of the balls is red?

Programming
Write a program (pseudocode) that would calculate and display the results for the multiplication table for values ranging from 1 to 100. This what I have so far: Declare X, Y, Z As Integer Write “10 x 10 Multiplication Table” For (X = 1; X<=10; X++) For (Y = 1; Y&...

Chemistry
How many mL of 5.5 M KOH are needed to prepare 300 mL of 1.2 M NaOH?

chemistry
How do you prepare a 0.4 M solution of sulfuric acid in water starting with concentrated sulfuric acid (18 M) and water?

chemistry
How do you prepare a 0.4 M solution of sulfuric acid in water starting with concentrated sulfuric acid (18 M) and water?

English
no seprate sentence

English
Sentence with: Locomotive revolting caricaturist contraband

HELPPPP ! -.-
EARTH SCIENCE ; NOBODY WANT TO HELP ME -.-

HELPPPP ! -.-
Describe how the principle of superposition was used in determining the relative ages of the cross-sections?

Science
Describe how the principle of superposition was used in determining the relative ages of the cross-sections?

Earth Science
Describe how the principle of superposition was used in determining the relative ages of the cross-sections?

math
if jhonny got a raise from 4$ to$4.60 what is the precentage of increase for one hour

Physics
Calculate the net charge on a substance con- sisting of a combination of 7.2 × 1013 protons and 4.8 × 1013 electrons. Answer in units of C

algebra 1
(w^3-57w+43) / (w+8)

business
I feel like it would be - C. focus exlusively on the initial salary rather than on benefits or furture opportunities. D. name a specific salary and be firm in the fact that you could accept no less.

Math
k/5+3/20<3/10 Please help me solve this and show your work please and thank you

Math
Simplify each expression. Write answers using positive exponents. a. (7x^2y^3)(-2xy) b. (a^2b^3)^-1(a^2b^3) c.(-4m^3)^2

Math
a. -14x^3y^4 ??

Math
c. -16m^6

Math
Simplify each expression. Write answers using positive exponents. a. (7x^2y^3)(-2xy) b. (a^2b^3)^-1(a^2b^3) c.(-4m^3)^2

Math
Simplify each expression. Write answers in standard form. a. (4d-6)(-3d) b. 5g(g^2-2g+1) c. (-2q^2+q+3)-5(q^2+2q-1)

business
From what I read, I believe the answer is C.

Math
A bottle contains at least 4 times as much juice as a glass contains. The bottle contains 32 fluid ounces. Write an inequality that shows this relationship. Please help me show your work please and thank you

Chemistry
How much 12 M HCl do you add to 1 L of water to obtain 0.2 HCl? Use this same approach to do the math for the dilution of 5.5 M of barium hydroxide solution to 0.5 M barium hydroxide solution.

Chemistry
How much 12 M HCl do you add to 1 L of water to obtain 0.2 HCl? Use this same approach to do the math for the dilution of 5.5 M of barium hydroxide solution to 0.5 M barium hydroxide solution.

vocabulary
A. denotative B. connotative

Algebra 1
simplify the expression: (y+5)^3

Criminal Justice
Suicide is the _____ leading causes of death in the US and the ______ leading cause of people between the ages of 15-34.

Chemistry
How much carbon dioxide has to be bubbled into aqueous sodium hydroxide to obtain a solution containing 3.5 mol of sodium hydrogen carbonate?

Chemistry
You dissolve 5 g of calcium hydroxide in 2 liters of water. What is the molarity of the hydroxide ions in this solution? What is the molarity of the calcium ions in this solution?

Chemistry
How much 0.5 M HCl is needed to neutralize 5.5 kg of ammonia dissolved in 6 gal of water?

business english
I believe it's B. When I tried it in my spell Checker it only underlined ''recieved"

Algebra
SOMEONE PLEASE ANSWER MY QUESTION

Algebra
SOMEONE PLEASE ANSWER MY QUESTION

Algebra
An airplane takes off from an airport at 7:00 a.m. traveling at a rate of 350 mi/h. Two hours later, a jet takes off from the same airport following the same flight pattern at 490 mi/h. How long would it take for the two planes to meet each other?

business english
I think 19 is B. When you check any of these under spellcheck - as a tip from another post with this same question, it only underlines "recieved" therefore, a spell checker would catch that as an error because its the only word actually spelled incorrectly.

Physics
A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations?

chemistry
what is the mass in grams of 0.0850 mol of hydrogen atoms?

physics
a speaker at a concert generates 1 x 10^-2 w/m^2 at a distance of 20m form the speaker at a frequency of 1kHz 1) calculate the wavelength of the waves emitted. b) what is the intensity level at 20m

physics
A shot putter projects the shot at an angle of 37 degrees above horizontal with a force of 980 Newtons (N). What are the magnitudes of the vertical and horizontal components of the 980 N force?

UofP
4(x-6)+6=6(x+2)-10

MATH geometry
A CRICLE HAS A DIMAETER OF 6FT. WHAT IS ITS CIRCUMFERENCE, ROUND TO THE NEAREST UNIT?

MATH geometry
A CRICLE HAS A DIMAETER OF 6FT. WHAT IS ITS CIRCUMFERENCE, ROUND TO THE NEAREST UNIT?

Physics
A plane flies at 800km/h in stationary air. The distance to be traveled is 3000km. What was the wind speed if the journey actually takes 4.0 hours?

Comm 100
What statements is true concnerning cultural context/ It involes verbal clues only It is about globalizaiton It is communicated primarily thorugh environment and nonverbal clues

physics
A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.9° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic friction...

physics
I am trying to study for my exam i have tomorrow and this type of problem keeps giving me trouble can someone please help me:: A 3.24 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=11.8N at an angle theta=23.0degrees above the hor...

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