# Posts by anna

Total # Posts: 2,754

math
trying to solve fraction problem 2/3+3m/5=31/15 been too long....

Physics
Car A is moving at a constant speed of 10.0 m/s and passes Car B which is at rest. 10 seconds after, the latter follows with an acceleration of 0.5 m/s2. Determine the distance that the latter has to travel before it overtakes the former. does it require quadratic formula? Oh ...

Chemistry
What will happen when 100 ml of diethyl ether are added to 100 ml of water and thoroughly mixed? a.) Water will form a separate layer on top of the ether layer. b.)The temperature of the mixture will significantly increase. c.)There will be a chemical reaction between ether ...

chemistry
Suppose a student started with 135 mg of trans-cinnamic acid and 0.52 mL of a 10% (v/v) bromime solution, and after the reaction and workup, ended up with 0.202 g of brominated product. Calculate the student's theoretical and percent yields.

math
Question: why is it not 2/9? Since I know 1 squared will be 1, which ends in 1, but what about 9? 9 squared is 81, it ends in 1. So that makes 2/9 = 0.22 @MathMate

math
Question: why is it not 2/9? Since I know 1 squared will be 1, which ends in 1, but what about 9? 9 squared is 81, it ends in 1. So that makes 2/9 = 0.22

Math
I have this question for summer homework: "Mary's quiz scores were 92, 85, 78, 71, 77, and 80. She says she had an average of 92 for her quiz scores. Which term best describes her average score? a. mean b. median c. mode d. range" I calculated the mean, and it ...

Algebra*
Short Answer. Find the following quotient: x^2-36/x+6

Algebra*
Short Answer. Find the following product: (x+7)^2

Algebra*
Short Answer. Find the following product: -3z(-z^2-9)

chemistry
SciMann Best Answer - Chosen by Voters Let UNITs guide you; always USE THEM in your calculation to prevent errors moles of Na in samp = 0.78 g/ atwt Na = ?? x moles NaBr * MW NaBr + (moles Na - x moles NaBr) * MW NaCl = 2.01 g x moles NaBr = [2.01 g - moles Na * MW NaCl] / [MW...

algebra*
Find the following product: -9x^5y(-5x^4y^6) A)-14x^9y^7 B)45x^9y^7 C)-9x^5y-5x^4y^6 D)45x^20y^6

Algebra
Divide and check: (3x^2-2x-13)divided by (x-2)

algebra
Lunc Capacity: The polynomial 0.041h-0.018A-2.69 can be used to estimate the lung capacity, in liters of a female find the lung capacity of a 40-year old woman who is 165 cm tall.

algebra*
Multiply (x^10+3)(x^10-3)

algebra

algebra
Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the sum of the areas of the circles shown in the figure. b)Find the sum of the areas when r = 5 and r = 11.3. this is what I got but I did not do it right. I needed to To write an expression for the sum, i need...

algebra
find a polynomial for the shaded area of each figure. (21t+8)(4t)-(3t-4)(2t) I did this problem incorrectly!

algebra
Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the sum of the areas of the circles shown in the figure. b)Find the sum of the areas when r = 5 and r = 11.3. this is what I got but I did not do it right. I needed to To write an expression for the sum, i need...

Statistics
Find the probability of at least one match. n = 62 How do I figure out r?

Physics
I'm having trouble following this. How do you go from: GM/4R - GM/R = -GM/(R + h) to 3/4R = 1/(R+h) to h=R/3?

Physics
Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. (b) If an object is fired directly ...

calculus
(SIN^8X-5 SIN^5X+SINX)COSX DX I need the answer to this, because I have tried so many times and cannot figure it out.

Physics
The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...

College Essay
Thanks! I will try to elaborate more why this experience is special to me in my conclusion...

College Essay
Well one of the options for the Common App is to: Evaluate a significant experience, achievement, risk you have taken, or ethical dilemma you have faced and its impact on you. So do you think this would be acceptable as my "significant experience", or is it too strange?

College Essay
One seemingly normal day in junior year, my friend and I were taking a train together home from school. We were on an extremely crowded F train headed for Queens. Packed against the door that separated one train car from another, overly warm and squished with no pole nearby to...

physics
I would tell you the steps I've taken so far but I have no idea where to even start. Any help is appreciated! Thanks! A uniform 33.5-kg beam of length = 4.15 m is supported by a vertical rope located d = 1.20 m from its left end as in the figure below. The right end of the...

Neoclassicism I english 11
yeah i need the answers too.

Accounting
I need help in working this problem...please help... Gaines Company recently initiated a post audit program. To motivate employees to take the program seriously, Gaines established a bonus program.Managers receive a bonus equal to 10 percent of the amount by which actual net ...

Accounting
I am trying to figure out how to do this problem: scenarios (projected \$90,000 annual cash inflow vs. projected \$70,000 annual cash inflow). Note, 5 years of \$90,000 per year equals \$450,000 of total cash received over the duration of the project (\$350,000 for 2nd project). ...

math
The answer is 16 because when you use FIOL for (5x-4)(5x-4) you get 25x^2 -20x-20x+16.Then you simplify to 25x^2-40x+16 to your original problem with the answer of 16 in the problem. FIOL is multiplying... the FIRST term then INNER terms then OUTER terms finally your LAST terms.

physics
If a concave mirror with a radius of curvature of 0.93 m has an object placed at 0.37 m in front of it, what is the mirror's focal length? Round your answer to 3 decimal places.

physics
If a concave mirror with a radius of curvature of 0.93 m has an object placed at 0.37 m in front of it, what is the mirror's focal length? Round your answer to 3 decimal places.

Calc
Oh, I forgot all about L'Hospital's Rule. Thanks!

Calc
Find the limit as x approaches zero from the right of ((sqrt((1+x)/(x^2))-(1/x)) I don't even know where to start with this. Help? P.S. If you go to the wolfphram alpha website and put copy and paste ((sqrt((1+x)/(x^2))-(1/x)) into the search bar you can see what it looks ...

Maths B
Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.

Year 11 English
thanks alot!!!

Year 11 English
Imagine you are the director of Rabbit-Proof Fence. Using what you have learned so far, how would you instruct the camera operator to help you communicate: a) how the girls are feeling during their walk home? b) how vast and empty the landscape is within the same scene? (1 ...

chemistry HELP plz!

Maths B
i don't get what you mean. Can you please explain it to me again.

Maths B
Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.

Maths B
Work out the 5 number summary Min=3 Q1=6 Median=8 Q3=14.5 Max= 24 IQR=Q3-Q1 =14.5 - 6 =8.5 Work out if 24 is an outlier or not. x-Q3>1.5*IQR 24-14.5>1.5*8.5 9.5>12.75 24 is an outlier

Year 11 Maths B
So does that mean n1=35 n2=8 m1=1715 m2=424 Total bag count: 43 Total Mass: 2139 New mean mass: 49.74418605 Round it to the nearest kilo 50kg. Is that correct???

Geometry
The volume of an oblique cone with equal diameter and height is 18pi cm^3. Find the height and radius(to the nearest cm).

Physics
A wave on a string is described by the following equation (assume the +x direction is to the right). y = (18 cm) cos[ðx/(5.3 cm) - ð t/(14 s)] What is its period? What is its speed? In which direction does the wave travel? To the left or to the right?

dosing
thank u

dosing
1 tbsp= 15 ml 1 fl.oz = 30 ml And then how many dose will be obtained in 12 fl.oz?

dosing
if 1 tablespoon is prescribed as a dose of medicine,approximately how many doses will be obtained in 12 fl.oz?

Math Problem ( 6th grade math)
Brandon tosses a coin 500 times. The coin lands on tails 320 times. A: What is the experamental probability of getting heads? B: Is the coin fair or unfair? Explain you answer.

Math!!
Eric bowls 35 times and gets 15 strikes. Fine the experimental probability that eric will bowl a strike. The answer first. Then explain what you did to get the answer

math
If d is the distance, and r is the radius of the earth (in feet), r^2 + d^2 = (r+32000)^2

Geometry
Given circle E with diameter AC and m<DAC=62 degrees, find mAD(arc).

Math
Anybody there???

Math
Also, Explain in words how you determined the probability of the player making the free throw.

Math
Thank You So Much Ms. Sue! Are you a teacher?

Math
So 1/3 would be the probability that the player makes the free throw?

Math
Well A player makes 4 of 12 free throws. Question: What is the Probability that the player makes the free throw?

Yes. Im in 6th grade also and i did intergers last month and yes you are correct! Good Job

science
When a Gila monster uses a rock for shade from the noonday sun, it is interacting with _____. (1 point) an abiotic factor another organism an ecosystem its community

Pre-Calc
How would you prove this identity? (sin^3(x)+cos^3(x))÷(1-2cos^2(x)) = (sec(x)-sin(x))÷(tan(x)-1)

Medical Terminology
I have to write a fictitious medical report containing this weeks vocab. It has to be at least 2 paragraphs describing a dermatologic condition or disease and contain all of the vocabulary and their definitions. My question is...how do I format this? If someone could give me ...

Biology
Another brain teaser I can't get: What are Mr. Rahn's favorite states" Hint: "it matters"

Biology
I can't figure out these brain teasers: i.e.point act char er ILL GET IT

Calculus
I'm supposed to find the average value of the function over the given interval. f(x) = sin(nx), interval from 0 to pi/n, where n is a positive integer. I know the average value formula, and I know that the integral of that function would be (-1/n)cos(nx), but I keep ...

Geography
What is the easternmost nation of southern Europe?

math
what is the unit rates for a store that had 30 customers in 12 min.

Chemistry
A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?

AP Chem
okay so i think i did this question correct but i get a little confused with equivalence point. If there is 25 ml of a .300M solution of HNO2...when i set up my ICF table, does that mean there is 7.5 mmol of HNO2 and OH- in the equation HN02 + 0H --> NO2 + H20 since it is ...

AP Chem
Consider 25.0 ml of .300 MHNO2 that is titrated with .500 M Find ph at eq pt

AP Chem
1.513g of monoprotic acid (HX) is dissolved in water, and the volume is 250.0 ml after the dissolving. The solution was then titrated 38.12g of .100 M NaOH to reach the end point of the titration. What is the molecular weight of HX?

chemistry
what are metals and non metals that are found in the human body and their function?

chemistry
what are the applications of the silicon atom with its isotopes of 28,29,and 30?

chemistry
give at least 3 atoms with its isotopes and its application?

Chemistry
What mass of Helium will occupy 2 times the volume of 10.0 grams of Neon if both gases are measured at STP?

Chemistry
A gas mixture contains 4.00 grams of O2 and 4.00 grams of He. If the total pressure of the gas sample is 4.67 atm, what is the partial pressure of each component?

Algebra 2
You would divide everything by 3 leaving you with f-1(x)= x/3 - 4

Analytical Chemistry
How many millimoles and molecules of solute are in 500 ml of a solution that is 5.41 ppm KMnO4?

math
A hypothesis test is conducted with respect to the mean weight (in ounces) of potato chip bags form a certain manufacturer. The hypotheses are: H0:  = 0.8 and Ha:  ≠ 0.8. Which confidence level would support the conclusion that there is insufficient ...

math
two negatives make a positive

math
12

math
36

chemistry
55.85 g/mol

statistics
The power of a significance test for a particular value of the parameter is computed to be 0.93. Which statement below is true? a) The probability of committing a Type I error is 0.07. b) The probability of committing a Type I error is 0.93. c) The probability of committing a ...

statistics
An SRS of size n is taken from a large population whose distribution of income is extremely right-skewed and the mean income is calculated. Which of the following statements is false? a) When n > 30, the sampling distribution of is approximately normal. b) When n increases...

Physics
A metal plate has a charge density of 85uc/cm^2 : Calculate the electric field strength at 14 cm above the plate

chemistry
Is it okay taking caffeine then ascorbic acid?

physics
I'm guessing skater 3, since they have the most mass and speed. Try plugging them into its formula

child day care
You’ve decided to operate a day care home. Which one of the following factors is the most important in helping you make your decision? A. Your family is willing to share their living space with the children in the program. B. Your home seems to be large enough. C. You ...

Physics
Find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air.

Chemistry- intermolecular forces
When a benzoate ion goes through solvation, what is the intermolecular force involved? Is is hydrogen bonding?

math
the cost of travelling by bus is Rs10 for the first km and RS 3 for every additional km. how much must be paid for a journey of 20 km?

art history
what was the most important contributing factor to the rise of cities?

art history
how did monasticism and feudalism differ? give two examples

algebra
1/z+8/1/z-2

algebra

algebra
An investor invested a total of of \$2500 in two mutual funds. One fund earned a 7% profit while the other earned a 4% profit. If the investor's total profit was \$14, how much was invested in each mutual fund?

algebra
r^3+216/r+6=

algebra
f(x)=v^2+13/v^2-4v-32 Find all numbers that are not in the domain of the function. Then give the domain in set notation.