# Posts by bridget

Total # Posts: 149

probability and Stats
How can I find standard error from each of the following: a) a proportion & a sample size? b) mean, standard deviation, and sample size? c) mean & standard deviation? thank you

Probability and Stats
A student was totally unprepared for a multiple-choice test and had to absolutely guess the answer to every one of the 100 questions. About what score (percent) would you expect him to earn if there were four possible answers to every question? I'm not sure where to start ...

Physics
what must be the net force if a 19.9 kg mass accelerates to the left at a rate of 2.2m/s^2?

Math
to the nearest hundred, what is the greatest whole number that rounds to 2,500? the least whole number?

english

two balls are juggled so that each ball is in the air for 1.800s, and the second ball is thrown up at the instant the first starts down. Find the height above the throwing hand where the two balls pass eachother, assuming gEarth=9.800m/s^2 I started with d=vt but we don't ...

Chemistry
I wrote the balanced equation for cream of tartar and baking soda: NaHCO3+KHC4H4O6->KNaC4H4)6+H2CO3 I identified the conjugate acid base pairs: NaHCO3 and H2CO3, KHC4H4O6 and KNaC4H4O6 I wrote a balanced equation for carbon dioxide gas and water: H2CO3->H2O+CO2 I ...

Physics Electric Circuits
3. A 15.0 ohm resistor is connected in series to a 120 V generator and two 10.0 ohm resistors that are connected in parallel to each other. b) What is the current through the 15.0 ohm resistor? c) What is the current through one of the 10.0 ohm resistors? b- I did 120 V/15.0 ...

Chemistry-Acids
Thanks. How do I know if a substance is formic acid?

Chemistry-Acids
Write a balanced chemical equation to show the reaction that occurs when each weak acid reacts with water. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.) (b) HCHO2 I've gotten a and c correct, and from that I know that ...

geometry
I had to complete the following solution by filling in the missing statements and reasons. I filled out the statements, but am having trouble wording the last two reasons. Following solution: x-2(3x-4)=18 Statement: x-2(3x-4)=18 Reason: Given Statement: x-6x+8=18 Reason: ...

educational technology
Number 4 for further reference is A

science
what is a vector?their structure?

History
Because I'm getting timed

History
1) Which best describes the difference that divide Maayan and Muhammad? A. Age and interest B. physical barriers C. Culture and politics *** D. Economic status 2) How does Maayan most directly experience the conflict in Israel? A. Through treating victims of terrorist attacks...

math
a sample consists of the following n =6 scores: 2, 7, 4, 6, 4, and 7 compute the mean and standard deviation for the sample

Math
54

english
During the storm, Jenna hid in her basement

Chemistry
What is the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen? -I found this to be C3H3O and WebAssign says it's right. I need help with part b. If the molar mass of the above compound is 110 grams/mole, what is the molecular formula?

math
Samantha was playing a fraction game where she could earn either positive or negative points on each turn.The lowest score she ever recorded was -26 2/3. The highest score was 8 3/4. Which. What expession represents the distance on a number line between her highest and lowest ...

Differential equations in Calculus...plsssss help?
Sorry for the confusion, it's (-1/15)T+5. And the last part is 75+30e^(-t/15) the fraction is all part of the e and is not divided by each other. I am confused on a through e mainly and g at the end. Should I solve the equation and just plug in 105 and graph the function ...

Differential equations in Calculus...plsssss help?
Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0) = 105. What does ...

Calculus with Diffrential Equations: Pleease help?
Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0) = 105. What does ...

Calculus
Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0) = 105. What does ...

Chemistry (Titrations)
You have to use the M1V1=M2V2 equation for this problem and plug in the values into the appropriate parts of the equation and solve for the missing molar concentration.

Help with differential eqs problem???? (Calculus)
I actually got 36 for K. Is this right? =4sin(3t) h'= 4*3*cos(3t) = 12cos(3t) h"= 12*3*(-sin(3t)) = -36sin(3t) h"= -k*h = -36*sin(3t) =36

arithmetic
In Jullian's garden, there are 3 rows of carrots, 2 rows of string beans,and 1 row of peas. There are 8 plants in each row. How many plants are there in all?

science help!!!!!!!!!
The answer is photosynthesis i just completed the test

Chemistry
A chemical formula shows the types and __blank__ of atoms in the smallest representative unit of a substance.

Statistics
According to a national poll conducted in 2010, seventy percent of teens reported having sent or received a text message while driving. Assume that I randomly survey 14 teens and asked them whether or not they have sent or received a text message while driving. a) What is the ...

statistics
population has mean 53 and standard deviation 12. Calculate the standard deviation of x bar for a random sample of size 12.

Math
Thank you so much.

Math
If two dice are rolled, what is the probability that a total is showing more than four

Math
If two fair dice are rolled, what is the probability that a total of five shows?

Math
Thanks

Math
If two fair dice are rolled, what is the probability that a total of five shows?

Math
Thanks. I got it. The answer is 3,628,800

Math
Suppose that we wish to seat ten people, 5 men and 5 women, in a row of ten chairs. In how many ways can we seat the people with no restrictions?

life science,maths lit,geography,tourism
is it possible 4 me 2bcum a social worker?

Public Speaking
in the speech preparations

math
1. 17x^2+6x-6 2. 3x^3+9x^2+18x did you get the same?

math
If A=3x+4 and B=x^2+2 and C=x^2+3x-2, find the following: 1. AC+B 2. (A+B)(B-C) 3. ABC

Chemistry
The cell diagram for the lead-acid cell that is used in automobile and truck batteries is Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s) where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the right-hand lead ...

chemistry
My teacher went over it really fast and now I'm just really confused about how to do my homework =( Calculate the cell potential for the following reaction as written at 25C, given that [Cr2+] = 0.821 M and [Ni2+] = 0.0190 M. Cr(s) + Ni2+ (aq) <==>Cr2+ (aq) + Ni(s) ...

Chemistry
Never mind, it's -.744V I figured it out!

Chemistry
Given these standard reduction potentials at 25 C 1. Cr3+ + e- ===> Cr2+ E1=-0.407 V 2. Cr2+ + 2e- ===> Cr(s) E2=-0.913 V determine the standard reduction potential at 25C for the half-reaction equation Cr3+ + 3e- ===> Cr(s) E=? When I tried, I got 1.08V and I honesty...

Art
Eugene Delacroix's Liberty leading the people commemorated?

math

algebra
thank you.

Math
Determine the equation of g(x) that results from translating the function f(x) = (x + 10)^2 to the right 12 units.

Math
Determine the equation of g(x) that results from translating the function f(x) = x2 + 5 upward 6 units.

Math
Determine the equation of g(x) that results from translating the function f(x) = x2 + 5 upward 6 units.

math
Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

math
Slope is 5 Parallel is 5 or 1/5 Perpendicular is -5

math
Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

math
Write equation in Standard Form Ax + By =C (-9, 7)(0, 3)

math
Thanks

math
Write an equation of the line with the given slope and containing given points. Slope intercept form Slope 4 through (-3, 3)

Ed-tech/History question~!
Yes d is correct i just took the test

math
1.graph equation y=4/5x 2.graph linear equation y=-1 3.find the slope of line -2x - 3y = 5 a. slope is b. slope is undefined?

dma040
Police officer to Speedzilla he was speeding at or above 120 miles per hour. Write an inequality to express Speedzilla speed, then show in graph, write in set notation.

dma040
Solve for x. 13/14x + 8/7 = 6/7x

dma040
Explain which terms are alike 7xy -9x^2 -15xy^2 -14xy

Chemistry
Hi, This is a challenge question for my intro chemistry class and I'd really like to do it. Its in 2 parts. 1. Consider a 2790-lb automobile clocked by law-enforcement radar at a speed of 85.5 mph (miles/hour). If the position of the car is known to within 5.0 feet at the ...

Dma 040
v =1/3ah, solve for h

Dma 040
V=1/3ah, V=21,h=3, solve

Dma 040
Thanx Jai...

Dma 040
V=1/3ah, V=21,h=3, solve

Dma 040
V=1/3ah, V=21,h=3, solve

Dma 040
Lenth of a rectangle is 7ft longer than twice the width. If the rooms perimeter is 158ft, whay are the rooms dimensions? Width Length

dma040
v=1/3ah solve for h

dma040
A number subtracted from 13 is the quotient of -34and 2. Find the number

Chemistry
Please help me out! Gas law homework! How many liters of HCl (g) at STP can be produced from 5.44 g of Cl2 and excess H2 according to the following equation? H2 (g) + Cl2 (g) --> 2 HCl (g) Thank you so much in advance.

Chemu
Hi! I need help with my Chem homework. "When acetylene, C2H2, burns, how many liters of O2 at STp are used for every mole of acetylene burned?" (Balanced equation: 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O)

Biology
Meh, it's not really hard if you have average memory strength and good note-taking skills. It also depends on how easy-going and clear your teacher is.

physics
what is the magnitude of the resultant of a 6.0n force acting vertically upward and a 4.0n force acting horizontally

math
5ft

ap chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO2 + O2 yields 2CO2 Delta H for this reaction is -566 kJ/mol run. What is the delta H for CO? 1). +270 kJ/mol 2). -110 kJ/mol 3). +65 kJ/mol 4). -405 kJ/mol 5). -65 kJ/mol 6). -182 kJ/mol 7...

ap chemistry ! i am so lost
how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J

ap chemistry ! i am so lost
how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J

arrays
67

math
suppose that you roll a pair of 8-sided dice total of 51 times. what is the probability that you will get a sum of 5 at least 3 times

algerabra 1
how do you find the equation for the line containg the side opposite the side containg the first two vertices?

algerabra 1
how do you find the equation for the line containg the side opposite the side containg the first two vertices?

English
2. If you ask me, there's no hobby like fishing.

English
In which sentence is an a homonym used correctly? 1. Karen's new dog had flees. 2. If you ask me , there's no hobby like fishing. 3. How many ours do we have to wait. 4. We had chocolate ice cream for desert.

MATH##\$\$&&^^**
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.

MATH
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following a. What scores fall between –1 and +1 standard deviation? b. What percent of all scores fall between –1 and +1 standard deviation? c. What score falls at +2 standard ...

math
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?

Math
Suppose there are 400 students in your school class. What class rank is the 20th percentile?

geometry
Need to find the perimeter in feet... The width is 35ft and 5in The length is 10ft and 3in Need to write the answer in feet... If there is anybody that can point me in the right direction.. I know I have to convert in. into feet.. and 12in= 1 foot

geometry
Ms. Sue, I am not an expert but I know that the numbers all have to be on one side and the letter on the other Ex. 43+114+X=180 114+43=157 157+X=180 Do the opposite operation to get letter alone so it would be -157 on both sides.. 157+X=180 -157+X=180-157 X=23 Hope that helps

A women has \$500,000 invested in two rental properties. One yields an annual return of 14% on her investment, and the other returns 9% per year on her investment. Her total annual return from the two investments is \$52,000. How much is invested at each return?

Geography
Are there 7 countries in Central America?

cognitive and langauge del.
interactionist

Chem 112
Calculate the pH of a buffer solution prepared by dissolving 0.12 mole of cyanic acid, HCNO and 0.65 mole of sodium cyanate, NaCNO in enough water to make 1.0 liter of solution. [Ka(HCNO) = 2.0 × 10-4] I know that this question has something to do with turning moles into...

chemistry
15ml of 0.325M NaOH is delivered into 35ml HOBr solution of unknown concentration.The pH of the final solution is 7.48. Ka for HOBr is 2.0 x 10-9at 25C. Find the number of moles of OBr- and HOBr in the final solution.

math
how can i find the GCF of a pair of numbers ? (ie 11 18, 8 6)

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