# Posts by liza

Total # Posts: 83

Math/Pre-calculus
Assume that the number of bacteria follows an exponential growth model: P(t)=P0e^k/t. The count in the bacteria culture was 400 after 10 minutes and 1500 after 35 minutes. (a) What was the initial size of the culture? (b) Find the population after 85 minutes. (c) How many ...

statistics
The lifetime of a type of electric bulb has expected value µ = 475 hours and standard deviation ? = 60 hours. (a) Use the central limit theorem to determine the expected value and standard deviation of the sample mean of n such lightbulbs where n = 100, 200, or 400. (b) ...

Math
In a state legislature there were 119 more members in the House of Representatives than in senate. If there were m members in senate, write an expression to represent the totial members in the state legislature. PLZ HELP!!!!!

Math
Fill in missing values for a rectangular prism? Length is 8. Width is missing. Height is 14. Surface area is missing. Volume is 324.8

physics
In prepairing a tea 600g of water at 90 degrees celsius is poured into a 200g China pot.Cpot=840 J/kg degrees celsius at 20 degrees celsius. What is the final temperature of water?

math
What is another way to write –3 • (4 + 7)? A –3 • 4 + 7 b –3 • 4 • 7 c –3 • 4 + 4 • 7 d –3 • 4 + (–3) • 7 *** I picked D because both results in 33

math
What's the difference then that's where I'm stuck

world history
was copra dried meat of coconut encountered, exchanged, and explored in history?

math
A picture 1.5 in by 2.5 in is enlarged in the ratio 5:8. Find the dimensions of the enlarged copy

CHEM
For a crystal with formula BaCl2.xH2O, a student conducted a gravity experiment and found out that 2.44 gram of this crystal can lost mass 0.36 gram when heated to 150 degree. Suppose water is the only reason of weight loss, what is the x value here? (Molar mass of BaCl2 is ...

Chemistry Lab
Suppose that you used 0.75g of iron. What is the minimum volume of 1.5 M_ CuSO4 solution required Using eqn. (3-1)? and eqn. (3-2)? (3-1) Fe(s) + Cu^2+ (aq) ---- Fe^2 (aq)+ Cu (s) (3-2) 2Fe(s)+ 3Cu^2+(aq) --- 2Fe^3+ (aq) +3Cu (s)

Chemistry
Suppose that you used 0.75g of iron. What is the minimum volume of 1.5 M_ CuSO4 solution required Using eqn. (3-1)? and eqn. (3-2)?

MATH 117A
Select the approximate values of x that are solutions to f(x)=0,where f(x)=-9x^2+7x+2 A.{-0.22,1.00} B.{-9,7} C.{-0.78,-0.22} D.{-4.50,3,50}

Math117A
An object 4.2 feet tall casts a shadow that is 12.6 feet long. How long in feet would the shadow be for an object which is 20.4 feet tall? a.12 feet B.6.8 feet C.28.8 feet d.61.2 feet

life orientation
The same question I am looking for...guys let's go to google and see if we are going to find right answer.

Math
The sum of the ages of Dorothy and Dona is 41. In five years, Dorothy will be twice as old as Dona. Find their ages 3 years ago.

English
I need a few characteristic to describe the following: The person quickly switches from loving one person to another.and The person is willing to die for someone even though they have only met for a few days. I thought of a few. But I can't really prove it like (impulsive-...

social
what is hwang ho civilization ?

Health
Which body part would you give to someone who is perceptive. Like, sees what's wrong with the business and changes it for the better. And why?

What body part would represent someone who is stubborn with their ideal but is flexible with small details? (Not brain or heart)

Body parts other than brain eyes and heart

Which body part would you give to someone who is perceptive. Like, sees what's wrong with the business and changes it for the better

What body part would represent someone who is stubborn with their ideal but is flexible with small details? (Not the brain or heart)

If you had to use a body part to represent that someone is independent. Which body part would you use and why?

parallel structures
how can i correct this sentece to parallel structute? When the movie Star Wars premiered in 1977, it was both surprising and a revolution in its special effects.

south africa/free state

math
If today is Thursday, what day of the week was it 1000 days ago

mth
Calculate the maturity value of a simple interest, eight-month loan of \$15,000 if the interest rate is 4.5%.

MATH
vIRGINIA THREW A fRISBEE FOR A DISTANCE OF 138.56 M TO CAPTURE THE WOMEN'S RECORD. IF THE FRISBEE WAS THROWN HORIZONTALLY WITH A SPEED OF 13.0M/S HOW LON DID THE FRISBEE REMAIN ALOFT?

math
For a rock, paper, scissors experiment, there are 30 tries with a partner. I won 16/30 times. What's the probability of winning between 10 and 16 times inclusively? How do you solve this?

trigonometry
sin 130.tan 60/cos 540.tan 230.sin 400

math
If "today is Monday" is true and "It is May 5th is false, which of the following is false? 1 - Today is Monday and it is not May 5th. 2 - If today is Monday, then it is May 5th. 3 - Today is not Monday only if it is May 5th. 4. Today is not Monday or it is May ...

microeconomics
How the technical rate of substitution and marginal product are related and what is their difference? i only wrote their definitions The technical rate of substitution measures the rate which the firm has to substitute one input for another, for keeping the output stable. It ...

Probability Statistics
a manufacturing plant uses 3000 light bulbs whose lifetimes are independently normally distributed with mean 500 hrs, and standard deviation 50 hrs. to minimize the number of bulbs that burn out during production hours, all bulbs are replaced after given period of operation. ...

physics
sand has more friction or less friction

Physics
An object is released from rest at height h above the surface of the Earth, where h is much smaller than the radius of the Earth. It takes t seconds to fall to the ground. At what height should this object be released from rest in order to take 2t seconds to fall to the ground...

Can i get a draw for this exercise cause i solved it but i cant see it Thanxsz

social studies
whats the contitution

math
A swimming pool is 25 meters x 15 meters. A concrete walk 2 meters is built around it. What is the area of a concrete walk?

Biology
the brief paragraphs explain the adaptations and accommodations MS l need live in the tundra, taiga, grass lands

statistics
42352

this problem got me so confused! :( but thanks for helping me! :)

math
7m

accounting
accounting and Organizational Cultures: A Field Study of the Emergence of a New Organizational Reality"

physics
A rigid rod of mass m3is pivoted at point A, and masses m1 and m2 are hanging from it, as shown in the figure. (a) What is the normal force acting on the pivot point? The ratio of the weights of m1, m2, and m3 is 1:2:3. (Use the following as necessary: m1 and g for the ...

statistics
Suppose that A,B and C are mutually exclusively events such that; P(A) =0.3, P(B)=0.1, and P(C)=0.5. Evaluate; P(AuBuC)

french
how would i say "look pretty" in vous form?

Science
why do Lithium (Li), Magnesium (Mg), and Aluminum (Al) react with HCl and Iron (Fe), Zinc (Zn), Lead (pb), and copper (Cu) don't react as much or don't react at all?

math
the third term of a geometric sequence is t3= -75 and the sixth term is t6= 9375. determine the first term and the common ratio

math
the "k"th term of a series, Sk=a 1-r^k/1-r, is the sum of the first "k" terms of the underlying sequence. the difference between the "n"th terms of two particular series is greater than 14 for some values of n (is an element of) N. the series with...

finance
A company wants to build a new factory for increased capacity. Using the net present value (NPV) method of capital budgeting, determine the proposal’s appropriateness and economic viability with the following information: • Building a new factory will increase ...

finance
A company wants to invest in a new advertising program. Using the NPV method of capital budgeting, determine the proposal’s appropriateness and economic viability with the following information: • The new program will increase current sales, \$10 million, by 20%. &#...

finance
A company wants to buy a labor-saving piece of equipment. Using the NPV method of capital budgeting, determine the proposal’s appropriateness and economic viability with the following information: • Labor content is 12% of sales, which are annually \$10 million. •...

English
Can you help me proofread the following paragraph and find nine misspelled or misused words and write them correctly? Planting a vegetable garden is a popular American hobby. It’s not ready that difficult. A gardening magazine or book can help you get started. Your plants...

English
Can you help me proofread the following paragraph and find nine misspelled or misused words and write them correctly? Planting a vegetable garden is a popular American hobby. It’s not ready that difficult. A gardening magazine or book can help you get started. Your plants...

chemistry
Calculate the molarity of a solution made by diluting 0.200 L of 1.00M HCl solution to a volume of 1.00 L

14cents/ounce=\$____lb

chemistry
a student mixed a 50.0mL of water containing 0.50 mols of HCl at 22.5 degC with 50.0 mL of water containing 0.50 mol NaOH at 22.5 degC in a foam cup calorimeter.the temp increases to 26.0 degC. how much heat in kJ was released by the reaction? please show how you found the ...

Physics
What should be the angle between two vectors of magnitudes 3.20 and 5.70 units, so that their resultant has a magnitude of 6.10 units?

math
This was the question : Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines. This is my answer:The formula for determining a slope using two points does not apply to vertical lines simply because dividing by 0 is ...

math /algebra
This was the : Explain why the formula for determining slope using the coordinates of two points does not apply to vertical lines. This is my answer:The formula for determining a slope using two points does not apply to vertical lines simply because dividing by 0 is not ...

Math /Algebra
I was challenged with this question: Explain why the formula for determining slope using the coordinated of two points does not apply to vertical lines. This was my answer: The formula for determining a slope using two points does not apply to vertical lines simply because it ...

algebra
List all the numbers from the given set that are, a.natural numbers b.whole numbers c.integers d.rational numbers, e.irrational numbers {-9,-4/5,0,0.25,ã3,9.2,ã100}

Math
What does relative to math?

A very tall light standard is swaying in an east-west direction in a strong wind. An observer notes that the time difference between the vertical position and the furthest point of sway was 2 seconds. The pole is 40 metres tall. At the furthest point of sway, the top of the ...

health
Are the concepts of autonomy, justice and beneficence, or similar ones, useful for analysis of organizational ethics?

accounting
Instructions Identify the internal control principles and their application to cash disbursements of Marais Company. P7-2B The board of trustees of a local church is concerned about the internal accounting controls pertaining to the offering collections made at weekly services...

Chemistry
What happens to iron sulphide when heated an what happens to iron when heated?

chemistry
What chemical test do you use to distinguish between iron and iron sulphide (axcept using a magnet)?

Chemistry
What chemical test (axcept a magnet) to use to distinguish between iron and sulphur?

English 1
How do you write a sonnet and a couplet and a quatrain. How do you know if a syllable is stressed or unsressed by just looking at the word

PE
While I'm running the mile I feel a real pain in my legs and always stop after running a couple of laps. How do I jog and not stop even if there is pain

How do you solve [x-1]=[x+3]

math
920%4

Books
How do I get a book published?

science
what are the names given to the diffrent changes of state?

Geography.../what does this mean?
" The earth's physical landscape is the result of conflict between forces..." Explain what this means. Thanks. Is it possible that forces move Earth around, sometimes the movement is opposing another landforce, they collide, and one slide under?

Math
how do we get equation of ellips?

science
I have to find out some facts about the dwarf planet vulcan. I have tried wikipedia but it was no help. Can any one please give me some facts or websites that can. This may be what you need. http://www.space.com/scienceastronomy/astronomy/epsilon_vulcan_000804.html

french
can you tell me which words are feminine or masculine radiateur miroir joueur du cd calendrier réveil boîte des bijoux lampe téléphone mobile vêtements bouteille de l'eau many thanks Thank you for using the Jiskha Homework Help Forum. First...

Math(Unit Rate)
I have a question what is 14 hours in two weeks in ratios

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