# Posts by karen

Total # Posts: 1,074

**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 ...

**Science PLEASE CHECK ALL**

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

**Science PLEASE CHECK ALL**

But... are they all correct?

**Please? Anyone?**

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

**Science PLEASE 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...

**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?

**BRCharter Academy**

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?

**Check my answers Ms. Sue?**

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**

okay

**how do i show my work math**

show your calculations

**how do i show my work math**

You would explain how you got the answer

**World History Check my answers**

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 ...

**World History Check my answers**

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 ...

**World History Check my answers**

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?

**6th Grade Math**

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

**Math**

Ryan's average for 5 arithmetic test was 89. On four of the tests he made 96,86,92, and 80. What did he make on the fifth test?

**Math**

A recipe or trail mix calls for 1/4 cups of raisins, 1 1/2 cups of granola, 1/2 cup of mixed nuts, and 1/8 cup of chocolate chips. What fraction of each ingredient is required to make 5 1/2 recipes

**Physics**

The tortoise and the hare are in a race of 1000m distance. The tortoise travels the entire race at a speed of 2.0 m/s while the rabbit runs the first 200 m @ 2.0 m/s. Then he stops to take nap for 1.3 hrs and awakens to finish the last 800m with an average speed of 3.0 m/s. ...