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Posts by AMANDA

Total # Posts: 2,548

Physics 1401
A 30 N object I a hung from a scale and dunked in water (density of 1000 kg/m^3), the measurement on the scale is only 20 N. what is the density of the object? Answer is 3000 kg/m^3, can someone show me how? Would be very appreciated.

Precalculus - check answer
The rate of U.S. per capita sales of bottled water for the period 2000-2010 could be approximated by s(t) = ?0.18t2 + 3t + 15 gallons per year (0 ? t ? 10), where t is time in years since the start of 2000. Use a Riemann sum with n = 5 to estimate the total U.S. per capita ...

Precalculus
The rate of U.S. per capita sales of bottled water for the period 2000-2010 could be approximated by s(t) = ?0.18t2 + 3t + 15 gallons per year (0 ? t ? 10), where t is time in years since the start of 2000. Use a Riemann sum with n = 5 to estimate the total U.S. per capita ...

Precalculus
Thank you so much, especially for that website!!

Precalculus
Find the area of the indicated region: Between y = x2 ? 5x + 3 and y = ?x2 + 5x ? 5 for x in [0, 4]. I keep ending up with 16/3, but this is incorrect.

Pre-Calculus
Annual sales of fountain pens in Littleville are 2,000 per year and are increasing by 10% per year. How many fountain pens will be sold over the next five years? Use an integral to solve this problem. I just need help setting the problem up - thank you!

Physics 1401
An Atwood's machine is built from m1=1kg and m2=2kg. The mass less string is passed over a friction less, mass less pulley. When the system is released from rest, what is the tension in the string?

chemistry
If you titrated 50 mL of HCl and 50 mL H2SO4, each of the same molarity, with NaOH. What is the numerical ratio of the volume of NaOH required for HCl compared to that for H2SO4?

Chemistry
Oxalic acid , HOOCCOOH (aq) , is a diprotic acid with Ka1= 0.0560 and Ka2=0.0145. Determine the [-OOCCOO-] in a solution with an initial concentration of 0.139 M oxalic acid. HOOCCOOH(aq) = HOOCCOO-(aq) + H+(aq) HOOCCOO-(aq) = -OOCCOO-(aq) + H+(aq) I have tried a ICE diagram: ...

Chemistry
Oxalic acid , HOOCCOOH (aq) , is a diprotic acid with Ka1= 0.0560 and Ka2=0.0145. Determine the [-OOCCOO-] in a solution with an initial concentration of 0.139 M oxalic acid. HOOCCOOH(aq) = HOOCCOO-(aq) + H+(aq) HOOCCOO-(aq) = -OOCCOO-(aq) + H+(aq) I have tried a ICE diagram: ...

Math ASAP
Yea I think it's c as well .

Chemistry
Please help. I have tried this a few different times and have come up with the same answer. What is the pH of the solution if 0.01 of HCl is added to a buffer containing 0.013 mol of RCOOH and 0.035 mol of RCOONa (source of RCOO-)? Ka = 2.7E-5 so far i have tried the following...

Precalculus - check
Yes, that's what I meant. :) Thank you both!

Precalculus - check
Find the derivative of the function. r(t) = log_4(t + sqrt(t)) My answer (sorry, it's messy): (1+(1/2sqrt(t)))(1/tln(4)+sqrt(t)ln(4))

Precalculus
Thank you!

Precalculus
An offshore oil well is leaking oil and creating a circular oil slick. If the radius of the slick is growing at a rate of 4 miles/hour, find the rate at which the area is increasing when the radius is 7 miles. (The area of a disc of radius r is A = ?r2.)

Precalculus
If f and g are functions of time, and at time t = 3, f equals 8 and is rising at a rate of 3 units per second, and g equals 5 and is rising at a rate of 8 units per second, then the product fg equals __ and is rising at a rate of __ units per second. I got 40 for the first ...

Statistics
Consider the population (1,3). Suppose you take all possible samples of size n=3 with replacement. What is the sampling distribution of the sample total?

Statistics
The weight of a randomly selected shipping container follows an unknown distribution with mean 12 tons and standard deviation 2 tons. Your cargo ship always carries a load of 100 randomly selected shipping containers. a. What is the probability the load weighs more than 1,231 ...

Statistics
LED light bulbs are manufactured with an average life span of 16 years and the bulb lifespans are known to follow an exponential distribution. a. What is the probability that a bulb will last longer than 14 years? b. What is the 50th percentile (or median) of bulb lifespans?

Precalculus
Johnny's Tumblers sells plastic cups in bulk for start-up restaurants. Their cost for producing these is modeled by: c(x) = 0.02x^2 + 0.5x + 40 a) Since the marginal cost is found by taking the derivative, the formula for c'(x)= ? (My answer: 0.04x + 0.5) b) The ...

Precalculus
Thank you!

Precalculus
Evaluate the given expression: d/dx[5(x^2 + 3|x|)] Any help with this is appreciated!

Chemistry
I am having trouble getting the right answer for this question please help. Calculate Kc for the FeSCN2+ formation equilibrium [FeSCN2+] = 3.49x10^-5 M [Fe3+] = 4.39x10^-4 M [SCN-] = 1.93x10^-4 Kc = [FeSCN2+] / ([Fe3+]-[FeSCN2+]) * ([SCN-] - [FeSCN2+]) I keep getting 546.266 M...

Chemistry
what mass of h2o is formed when h2 reacts with 384g of o2?

Chemistry
Use the concentrations and volumes of hydrogen peroxide and KI before mixing (Table 1), calculate the post-mixing concentrations. Before mixing: [H2O2] = 0.88M [KI] = 0.500M Table 1: before mixing 1. Vol H2O2 = 4.0 mL, [H2O2] = 0.88M 2. Vol KI = 1.0 mL, [KI] = 0.500 M units: M...

8th Social studies
They have helped me very much.

8th Social studies
I can see you guys are not very helpful that's why jisksha sucks. If you want some help you go to quizlet or brainly these are really helpful websites they are way better that jiskha.

social studies
The answer is on brainly .

SS
I just took the test and the correct answer is A.

Social studies
Thg is correct 100%

Chemistry
Calculate the expected freezing point of a solution of 0.579 g pelargonic acid in 4.225 g of lauric acid, if the melting point of pure lauric acid was measured to be 43.20*C. (MM pelargonic acid = 158.2 g/mol; MM laruic acid = 200.32 g/mol). Kf for lauric acid is 3.90*C/Mc; ...

Chemistry
Element X has a face-centered cubic unit cell structure. If the density of the element is measured to be 12.4 g/cm^3, what is the atomic radius of X? units are in pm (picometers) I can't seem to find how to get the atomic radius with only the density given for an unknown ...

Science
If one sound registers one decibel more than another, then it is ____ times as intense? Round your answer to three decimal places.

Math
I have 100 bucks to buy 100 fruits. The fruits which I need to buy are- mango; which is 20 piece for 1 buck, lichi; which is 1 piece for 1 bucks and coconut; which is 1 piece for 5 bucks. How many each of those fruits do I have to buy to get this result-100 fruits for 100 bucks?

Math
I have 100 bucks to buy 100 fruits. The fruits which I need to buy are- mango; which is 20 piece for 1 buck, lichi; which is 1 piece for 1 buchan and coconut; which is 1 piece for 5 bucks. How many each of6the fruits do I have to buy to get this result-100 fruits for 100 bucks?

History
J answers are correct thanks so much !

math
Richard is 6 years older than Lisa, and in 5 years the sum of their ages will be twice as much as the sum of their ages 4 years ago. Find their present ages.

Math
Oh reiny this was such a big help you have no idea thank you so much

Math
Can someone please help me with my open needed question Solve the system by substitution -X-y-z= -8 -4+4y+5z =7 2X+2z= 4

maths trigonometry
Expand the following using compound angle formulae Sin(m-n) Cos(p-55)

Government
I know that the protesters often at military funerals protested however

Government
I need help on these two questions these are my answers. The U.S Congress is a bicameral branch of government in which each state A) Is represented based on population in the House of Representatives and is equally represented in the Senate B) Elects members of the Senate and ...

Math parallel lines and angles
1.Find the mesure of <s A. 63 B.153 C. 68 D.148 2. If a and b are parallel m<3=128 what is the measure of <8 A.134 B.52 C.54. D.49 3. Select the measures of complement or supplement of an angle. If there is no compliment or supplements select no complement or ...

math
The angle of an elevation of the top of a radio mart from a point 53meter from its base on ground level is 61degrees ,find the height of the mart to the nearest whole number.

History
The answer is on brainly .

Maths fractions
41/2 x ?=111/4 They're mix numbers.

English
Who is miss Lucas and Mrs Hurst in pride and prejudice?

Maths algebra
I wrote 47.235 as my answer then it asked me to use the calculator to find a complete answer.How I'm I suppose to do this. please I need help I got a test tomorrow. Thank-you.

Maths
I wrote 47.235 as my answer then it asked me to use the calculator to find a complete answer.How I'm I suppose to do this. please I need help I got a test tomorrow.Thankyou

Maths
A median of a number is 5. A mean is 5. They're five different numbers. They're not integers. Workout the numbers. Please help me I got a test tomorrow please!:)

science
Gravitational force =mass x 9.8m/s2 what is the force of a polar bear weighing 1500kg?

Business Psychology
The CEO of a multinational manufacturing company, with its headquarters in the UK, is considering aligning its organisational culture across all of its sites of operation. Currently, other than the UK, these are located in the US, Japan, and Finland. ‘Critically discuss ...

Chemistry
How many moles of air must be pumped into a 4.8 L tire to give it the pressure of 47.1 psi at 25°C ? I'm not sure how to even start doing this problem.

Physics
A bar of length 2L can rotate about a frictionless axle at its center. The bar is initially at rest and is then acted on by the three forces shown. What is the magnitude of the net torque on the bar?

english
Identify the subject, object, and verb in this sentence: Paralegals must have good ethics.

business statistics
1. The average life expectancy of people around the world is 71.30 years with a population standard deviation of 8.00 years. I take a sample of 50 countries now and find that the average life expectancy is 74.37 years. Suppose I’m interested in seeing if there has been a ...

Statistics
Need help with this statistics assignment. Of course not asking for you to do it, just an example or help on how to answer. Find some information in a book, research article, newspaper, magazine, or online about any kind of medical research that includes a measure of center or...

Biology
Thanks.....

Biology
Has anyone done the effect of cell size on material transport portfolio in Connections academy?

Math Check Answers
Write a rule for the function represented by the table. x y 0 13 1 28 2 43 3 58 y= 15 + 13x y= 14 + 12x y= 13 + 15x** y= 12 + 14x Which function rule would help you find the values in the table? j k 2 -12 4 -24 6 -36 8 -48 k= -12j k= -6j** k= j - 12 k= j - 6

Math Check Answers
What do you mean, oh sorry the first was, help?

Math Check Answers
Write a rule for the sequence 8 -1 -10 -19... Start with 8 and add -9 repeatedly** Start with-9 and add 8 repeatedly Start with 8 and add 9 repeatedly Start with 8 and subtract -9 repeatedly Find the next three terms of the sequence. -4 -8 -16 -32... -96 -288 -864 -64 -128 -...

Chemistry
A hypothetical pure element consists entirely of two isotopes. The natural percent abundance of the isotope with mass 25.5 u is 78.8 percent. The other isotope has mass 29.5 u. Calculate the atomic weight of the naturally occurring element.

I am having trouble with this homework question ,
This is wrong

I am having trouble with this homework question ,
Thanks

I am having trouble with this homework question ,
Here is the probability model for the blood type of a randomly chosen person in the United States. Blood type O A B AB Probability 0.53 0.21 0.03 0.23 What is the probability that a randomly chosen American does not have type O blood? % Round to the nearest 0.01%

MATH HELP ASAP
Super, thanks!

MATH HELP ASAP
Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 18 16 8 42 Female 7 17 9 33 Total 25 33 17 75 If one student is chosen at random, Find the probability that the student was NOT a female that got a "A"

MATH 125 help
Lol

MATH 125 help
Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 4 17 20 41 Female 15 7 19 41 Total 19 24 39 82 If one student is chosen at random, Find the probability that the student did NOT get an "B"

Math Help ASAP SETS & Probability
Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 2 10 17 29 Female 7 15 4 26 Total 9 25 21 55 If one student was chosen at random, find the probability that the student got a C.

Probability Help ASAP!
Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 17 5 2 24 Female 7 11 12 30 Total 24 16 14 54 If one student was chosen at random, find the probability that the student was female.

Probability
Giving a test to a group of students, the grades and gender are summarized below A B C Total Male 8 10 12 30 Female 4 11 3 18 Total 12 21 15 48 If one student was chosen at random, find the probability that the student got an A.

Cards Probability
As shown above, a classic deck of cards is made up of 52 cards, 26 are black, 26 are red. Each color is split into two suits of 13 cards each (clubs and spades are black and hearts and diamonds are red). Each suit is split into 13 individual cards (Ace, 2-10, Jack, Queen, and ...

PROBABILITY : M&M'S
That's it

PROBABILITY : M&M'S
A BAG OF M&M'S HAS 3 RED, 7 GREEN, 6 BLUE AND 5 YELLOW M&M'S . WHAT IS THE PROBABILITY OF RANDOMLY PICKING.

PROBABILITY MATH HELP!!!!!
Ok, what is b?

Math
Convert the given exponential function to the form indicated. f(t) = 2.7(1.004)^t --> f(t) = Q0e^kt I'm not even sure where to start with this one - any help would be greatly appreciated.

Math - check answer
Thank you both!

Math - check answer
Frogs have been breeding like flies at the Enormous State University (ESU) campus! Each year, the pledge class of the Epsilon Delta fraternity is instructed to tag all the frogs residing on the ESU campus. Two years ago (t = 0) they managed to tag all 58,000 of them (with ...

algebra 1
I need to solve this inequality 3(x-2)>-3

Calc BC (Rates of change and tangent lines)
Find the derivative of y = 1/(x-1) Rewrite y = 1/(x-1) as y = (x-1)^-1 We can now use the power and chain rule. dy/dx = -(x-1)^-2 times 1 (times 1 because you have to multiply by the derivative of the inside function dy/dx = -1/(x-1)^2 Now, plug x = 2 into the dy/dx dy/dx = -1...

College Algebra
A manufacturing company finds that they can sell 375 items at $2.50 per item and 225 items at $3.50 per item. If the relationship between the number of items sold x and the price per item p is a linear one: Find a formula that gives x in terms of p: x= Now use the formula to ...

Math
Of course, I was overthinking it. Thanks!

Math
The organized crime boss and perfume king Butch (Stinky) Rose has daily overheads (bribes to corrupt officials, motel photographers, wages for hit men, explosives, and so on) amounting to $30,000 per day. On the other hand, he has a substantial income from his counterfeit ...

Math HELP!
Richard paid $80 per hour plus $55 for parts to get his computer fixed. If Richard paid a total of $175, how many hours did he pay for?

math
math problem-Car payments are determined using simple interest. To finance your vehicle purchase you have two choices. Write two equations, one for each bank, that models the banks' loan options using x for the price of the vehicle and y to represent the total cost (price...

English
What chapter in the novel "Color of Water", by James McBride gives multiculturalism a new meaning? The book is a "Black man's tribute to his white mother" and tells his story along with his mother's story from both of their point of views. ...

Chem
When 4.5 mol Al reacts with 11.5 mol HCl,what is the limiting reactant, and how many moles of H2 can be formed?

Chemistry
Hi, I've been working for nearly 2 hrs on this problem, but I'm stuck on the next step. Thanks for any pointers in the right direction. My problem is: How many grams of S8 are needed to produce 225 grams of sulfur hexafluoride? I was given this formula: S8+24F2(Arrow)...

Chemistry
By the way, my son first posted this question and received a message that it did not post. So in trying to help him, I reposted a similar question. Sorry for the double post of this problem. Thanks!

child development
I've been trying to search for a scholarly article for a while now. Giving me a link to a google search of scholarly articles doesn't help. I was hoping you could give me the link to an article that would help

child development
How does social and emotional development affect physical development?

Math Help!
guys i came here looking for answers on the same thing, i don't think you guys understand how behind we are, so if anyone from CONNEXUS knows the answers for a fact then may we see them? im not being rude i jut need help quickly :)

english
Number 1 and 3 are wrong. Number 2 is correct.

dragon wings
i just took the quick check fro connections academy future answer seekers and the answers are 1-D 2-D 3-B 4-D your welcome :)

dragon wings
so like is no one gonna say what the answer ended up being? i came here to find out?

Social Studies
Exactly what plans are you taking about ?

Life orientation
How the geographical distribution of media can be improved in south african

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