# Posts by karen

Total # Posts: 1,077

Biochemistry
What is the condensed structural formula of cyclopropane?

Math
A Texas oil drilling company has determined that it costs \$25,000 to sink a test well. If oil is hit, the revenue for the company will be \$500,000. If natural gas is found, the revenue will be \$150,000. If the probability of hitting oil is 3% and of hitting gas is 6%, find ...

math
what is the effective interest rate of an 8% 13-week treasury bill? assume it is a \$10,00 treasury bill, and round to the nearest hundredth percent

Statistics
A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last . Less than 250 hours b. Between 225 and 375 hours c. More than ...

Algebra 2
E6------E= -0.378eV E5------E= -0.544eV E4------E= -0.850eV E3------E= -1.51eV E2------E= -3.40eV Use the figure shown above to determine how much energy a hydrogen atom with its electron in the E2 energy level must absorb for the electron to be removed from the atom. a. -0....

Math
There is 5 gallons of pineapple juice and I have a six oz glass how many drinks do I get out of the five gallon jar ?

chemistry
Calculate the concentration of all species in a 0.20 M KF solution.

Math
What is the approximate circumference if diameter is of 23 feet

Math
Place parentheses in the expression to make it equal 60? 2×6+6+3×2

Pre-Calculus
How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(?1 - cos x/2), just don't know what to do from there.

Pre-Calculus
How to solve sin(x/2) = 1 - cos x? I know you would use the half angle identity sin(x/2) = +-(?1 - cos x/2), just don't know what to do from there.

Math
when z is divided by 8, the remainder is 5. What is the remainder when 4z is divided by 8. Can you please explain this to me step by step? I'm having difficulty understanding why the answer is 4

Math geometry
The measure of an angle is twenty more than three times it's supplement. What are the measures of each angle?

Geography
The distance between station x and y on the map is 7cm. Find the actual ground distance between the two stations if the map scale is 1:100000

english
First and foremost, let's try to find out the definition of "aural". Aural, according to merriam-webster online is relating to the ear or sense of hearing. So, to answer to the question which phrase or word can be referred to aural learner, the correct answer is ...

Algebra math
The slope of the first Y is equal to= -1 The slope of the second Y is equal to= -1 So as both slopes are the same: x + y = 2 and x+y= -3 Are parallel

Physics
A table is supported against a wall forming an angle with the vertical. The coefficient of static friction between the table and the floor is (?e). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value that the angle can take ...

American Government
Why did the framers insist that federal judges be appointed for a lifetime of service?

Physics
How long does a car with an acceleration of 2.0 m/s2 take to go from 10 m/s to 30 m/s a. 3 m b. 6 m c. 18 m d. 36 m

Algebra
The total tickets sales for a highschool basketball game were \$2.00. The tickets price for students was \$2.25 less than the adult ticket price. The number of adults tickets sold was 230, and the number of students tickets sold was 180. What was the price of the adults ticket?

Statistics
A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

algebra
if Sam invested \$10,000 at simple interest, some at 3% and some at 4% and paid \$320 , what was the amount invested at each rate?

Pre-Calculus
The amount of force required to compress a spring is inversely proportional to the distance that it has been compressed. For one certain spring, it takes 5 pounds of force to compress it from its natural length of 18 inches down to 12 inches. How much force would be required ...

Stoichiometry
Equation to use Al + Cl2 -> AlCl3 You have 8.6 moles of aluminum, how much in moles of chlorine do you need to react completely? Desperate. Trying to teach daughter on the spectrum and I'm stumped on how to start.

Math
For every 5 highlighters that Agnes buys , she gets 1 free. If Agnes needs 80 highlighters, what is the least number of highlighters she has to buy?

Math
Aaron and Ben have a total of 976 trading cards. Ben has 7 times as many cards as Aaron. How many cards should Ben give Aaron so that Aaron will have 3 times as many cards as Ben?

Math
The temperature at 8:00 a.m. was 46°F. By 1:00 p.m. it was 18° warmer. Which equation would help you figure out what temperature it was at 1:00 p.m.?

chemistry
The amount of lead in drinking water is 0.025 mg/L. Express this concentration in molality. {molar mass of lead is 207.2 g/mol and the density of water is 1.00 g/cm.}

chemistry
Molarity material = density x 1000 x (%/100) x (1/molar mass material) 1000 indicates?

chemistry
How many milliliters of concentrated nitric acid, HNO3, 70 % (wt/wt) are required to prepare 1 liter of 0.250 M solution? The molar mass and density of HNO3 are 63.0 g/mol and 1.36 g/cm respectively.

Math
The price of a home is 177,000. The bank requires a​ 20% down payment and three points at the time of closing. The cost of the home is financed with a​ 30-year fixed-rate mortgage at 10​%.

math
A bird beats it's wing 24 times per second. How many times will it beat it's wing in one hour

PHYSIC
In 20m that is 60s 40m is 7.5s 60m is 50s in one second is 300m

math
Circumference of a circle=2x3.142xr Since the c is 65.94 That is 65.94=2x3.142xr 65.94/6.2831853=r R=10.49467695 approximately 10.5 (N:B 6.28... Was found by 2 x 3.142)

Math
A total of 120 students attend top view high school.the ratio of teachers to students is 1:30. Whats the answer

Math
120 students attend top view high school.the ratio of teacher to students is 1:30.

Math
During summer vacation, Sanjay writes letters and postcards to his friends at home. A letter costs \$0.41 to mail and a postcard costs \$0.21 to mail. Sanjay writes to 8 friends and spends \$2.08. How many letters and postcards he sends.

Math question urgent
Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself \$300 every month for the next 25 years? Present Value = 900(1 - 1.0041666..)^-300)/.0041666... = \$153,954.05 I have ...

Math
Present Value = 900(1 - 1.0041666..)^-300)/.0041666... = \$153,954.05 I have calculated this, but it is wrong. Any ideas?

Math
Mrs. Hart, at age 65, can expect to live for 25 years. If she can invest at 8% per annum compounded monthly, how much does she need now to guarantee herself \$300 every month for the next 25 years?

math
Jeremy takes out a 30-year mortgage of 220000 dollars at an annual interest rate of 7 percent compounded monthly, with the first payment due in one month. How much does he owe on the loan immediately after the 87th payment? I have tried 204311.1024, but not successful

Geometery
2x-2+2x=54 4xx-2=54-2 4x/4 = 52/4 x=13

Math
A ship starts at port P, sails 226 deg (T) for a distance of 120 km. 1. How far south of P is it? 2. How far west of P is it?

physics
you walk 95.0 m at a speed of 1.26 m/s and then run 95.0 m at a speed of 3.61 m/s. what is the average velocity?

World history
A c b

World history
1Which of the following would john locke most favor Republic Oligarchy Theocracy Absolute monarchy 2Whay was james i resistant to working with parliament He believed in the absolute power of kings He did not agree with the policies of the prime minister 3Which statement gives ...

Management Science
For your phone calls, you can either A) buy a prepaid monthly plan, or B) pay as you go. A cost \$50 per month and calls are free up to 8hrs. Any extra min for that month will cost you \$.25. B has a cost of \$.15 per minute. What are the two total cost if you plan to talk for 5 ...

Ah, wow. The silent treatment. Okay. Well. Thanks for the help? I guess? I don't know. This is stupid. Thanks anyway... lazy tutors.

But... are they all correct?

I really, really need someone to check over this. :)

1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. *** C. A living thing dies and its skeleton is left exposed...

Science CHECK ALL
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. *** C. A living thing dies and its skeleton is left exposed...

chem II
calculate the number of moles of solute present in 50.0g of an aqueous solution that is 1.5m NaCl.

MATH
The Eiffel Tower has a surface area of approximately 76,000 square meters. A restoration company charges \$80 per sq yard for re-painting. How muuch will it cost to paint the Eiffel Tower

Accounting 220
On January 1, 2014, Muoy Machining Co. purchased a compressor and related installation equipment for \$72,500. The equipment had a three-year estimated life with a \$12,500 salvage value. Straight-line depreciation was used

Math
Allan gave 5/8 of his money to his son and then gave his daughter 1/2 of the remainder. He kept \$150.00 for himself. How much money did Allan have at the beginning? How much money did his son get?

math
If ribbon costs \$3.50 for 25 inches, then how much does 2 yards of ribbon cost?

Explain how the line plot would change if you measure a purple pen that is inches long

Chemistry
How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol

Math
a science class has 5 girls and 3 boys in the seventh grader and 2 girls and 6 boys in the eight grader. the teacher randomly selects a seventh grader and a eight grader for a class competition. what is the probability that the students are both boys

Statistics
A volunteer ambulance service handles 0 to 5 service calls on any given day. The probability distribution for the number of service calls is as follows: one column has number of service calls (X) those numbers are 0 1 2 3 4 5. The next column Probability P (X) those numbers ...

Chemistry
ahh thank you so much!

Chemistry
Three isotopes of Neon occur naturally: 20Ne (mass = 19.9924 amu) 21Ne (mass = 20.9938 amu) 22Ne (mass = 21.9914 amu) If the percent abundance of 21Ne is 0.2600, what is the percent abundance of 20Ne? How do I set up for these type of problems. I tried just using two and ...

Chemistry
How do you Find the mass (in g) of Carbon in 2.980 g Carbon dioxide? I saw the question asked before but couldn't find a solution.

math
Area of a triangle is72cm squared base=12 height=?

chemistry
A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressu of the three gases in the tank are 5 atm of O2, 900 mm Hg of N2, and 1.4 kPa of He what total pressure inside of the tank?

COLLEGE ALGEBRA
Find the dimensions of a rectangle with a Perimeter of 100 cm - its width is 2/3 its length.

Chemistry
How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?

I posted this in my last question but its not showing up for me.. But i have redone the questions you said were wrong and i was hoping you would check them again 1. How did the southern economy change after the Civil War? Shipped raw materials to northern states for processing...

how do i show my work math
how much is 1/3

how do i show my work math

how do i show my work math
You would explain how you got the answer

Thank you!

Ms. Sue Help again??
Iv'e redone the wrong answers. 1. How did the southern economy change after the Civil War? Shipped raw materials to northern states for processing Plantations were replaced by a new system of sharecropping and tenant farming.* 3. Which economic philosophy allowed American ...

1. How did the southern economy change after the Civil War? Southern farmers focused on one main cash crop.* Shipped raw materials to northern states for processing Plantations were replaced by a new system of sharecropping and tenant farming. 2. The Bessemer process was used ...

Okay so i put a star* by each of my answers.

Chemistry
A 50.0g sample of copper at 10.0 C is placed in 200.0g H20 at 40.0 C in a calorimeter. Heat flows from the water to the copper until both are at 39.3 C. What is the specific heat of copper? (Csp H20 is 4.18J/g*C.) I don't have any idea how to do this problem. If someone ...

Math
Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.? i am in grade 11 :), studying ahead of the class :) its 8 pm here, this question is ...

math
Two ships leave port at 4 p.m. One is headed N38°E and is travelling at 11.5 km/h. The other is travelling at 13 km/h, with heading S47°E. How far apart are the two ships at 6 p.m.?

Hunt
Wyatt and Allyson were asked to solve a percent problem using the number 13 and 38. Wyatt found 13% of 38 and allyson found 38% of 13. Explain why they both got the same answer. Would this work for other numbers as well? Why or why not?

Physics
A 5000 kg truck rear ends a 2500 kg car. Both vehicles applied brakes at the moment of the impact and began to skid. After the impact, the acceleration of the truck is -2 m/s and the acceleration of the car is -3 m/s. If the car skid for 30 m and the truck for 2 m, how fast ...

English Grammar
Is there anything you need to specif at today?

Math
Part A: Max rented a motorbike at \$465 for 5 days. If he rents the same motorbike for a week, he has to pay a total rent of \$625. Write an equation in the standard form to represent the total rent (y) that Max has to pay for renting the motorbike for x days. Part B: Write the ...

science
A glass bottle has a volume of 1L and weighs 500g. When half filled with oil, it weighs 1750g. What is the density of the oil in the bottle?

chem
The mystery compound CxHy is completely reacted with O2 to yield 44 gr CO2 and 18gr H2O. What is the empirical formula of CxHy? I got : C1H2 How much O2 in grams was used in this reaction??

chem
Is it 2E-11?

chem
Assume that the atomic diameter of an atom of element X is 2A and that 1.0 x 10(16th) atoms are arranged in a simple 2D square array. What is the length of each side in cm?

chem
I don't understand it either. I typed it exactly as it is asked. Except the > represents and arrow.

chem
Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate the H per mole of H2O reacted.

chem
So Fe304 is being reduced and C is the reducing agent? Would the initial and final oxidation states be C and 2C?

chem
When balancing the following, what is being reduced, what are the reducing agents, and what is the initial and final oxidation states of the reduction agent? Fe3O4(s) + C(s) > CO2 (g) + Fe

chem
Fe3O4(s) + C(s) > CO2 + Fe Balance the chemical reaction and calculate how many moles of Fe3O4 must be reacted to produce 440 gr CO2 (the > is an arrow)

chem
But how do I convert 2.0 x 10 (-13) km to cm?

chem
2.0 x 10(exp-13) km/0.01=

chem
Consider the unbalanced reaction CO + H2O > CH4 + O2. All reactants in the gas phase. Calculate H per mole of H2O reacted. (The > is an arrow)

Statistics
At the end of the Halloween Festival the organizers estimated that a family of participants spent an average \$45.00 with a standard deviation of \$12.00. What’s the probability that the mean amount spent will be between \$20 and \$30?

Caleb sold boxes of candy. Some sold for \$2, and some sold for \$3. He sold a total of 35 boxes and received \$92. How many boxes did he sell for \$2?

Distributed Management System
what is the crow's foot ERD of this problem?

Math
89=(93 + 86+ 92+ 80+ x) / 5 Solve for 89 x 5 = 445 Add other grades 93+86+92+80=351 445-351=x x = 94

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