# Posts by Melissa

Total # Posts: 1,305

**Chemistry**

1. A hypothetical pure element consists entirely of two isotopes. The natural percent abundance of the isotope with mass 25.5 u is 86.1%. The other isotope has mass 29.2 u. Calculate the atomic weight of the naturally occurring element. 2. Suppose that a hypothetical element ...

*November 15, 2015*

**Math**

What is the original cost of an item if $129.00 is 80% off?

*November 9, 2015*

**math -4th grade**

I believe you are correct for #1. The answer for question #2. You wouldn't be able to have a final score of 1 because the only way you can get 1 point is if you already have 6 points from a touch down.

*November 9, 2015*

**Physics**

A 5 g bullet has a speed of 300 m/s and embeds itself into a 500 g block. The block is initially at rest sitting on a rough surface which has a coefficient of kinetic friction equal to 0.5. A) What is the speed of the block after the collision? which is= 2.97 m/s B) What ...

*October 15, 2015*

**pre - algebra**

what is the decimal equivalent to 27/100?

*October 15, 2015*

**Algebra 2**

Create multiple representations of each line described below A line with slope 4 and y intercept -6

*October 13, 2015*

**Algebra 2**

X-3/x=3/5

*October 13, 2015*

**physics help**

Three co-linear forces f1=45 N west,f2=63 N east and an unknown force f3 are applied to an object.The resultant force of the three forces is 12 N west determine the magnitude and direction of the force f3 using an algebric calculation(vector addition) answer fres=f1^2 f2^2 12=...

*October 8, 2015*

**math**

The temperature dropped 12 degrees Celsius from 10pm to 4am one night. What is the average drop of the temperature 12 divided by 5 = ____

*September 30, 2015*

**Math**

Does .0303 equal 303/10,000

*September 25, 2015*

**Math**

Thank you. That makes sense. I was doing the order of operations wrong.

*September 25, 2015*

**Math**

I need help with this order of operations problem. also x in the problem is the multiplication symbol. 44-4x(5+3x2) I got 44-4x(11) 40x11=440 Am I correct?

*September 25, 2015*

**Science**

I have two containers, one is 2ml and the other is 5ml. Which would fill both containers all the way. A.gas B.liquid C.solid D. a combination I believe its A. I am right

*September 25, 2015*

**Physics**

A rocket engine can accelerate a rocket launched from rest vertically up with an acceleration of 18.4 m/s2. However, after 49.6 seconds of flight the engine fails. Neglect air resistance and assume g = 9.80 m/s2 throughout the flight.

*September 23, 2015*

**geography(development)**

What are the Four Negative results of development?

*September 20, 2015*

**geography(development)**

Would you say that the division of the world in the northern and the southern part is based on economic development,sustainable development or social development?

*September 19, 2015*

**chemistry**

A sample of a copper chloride of mass 1.425g is treated with a water solution of silver nitrate, and the AgCl formed had a mass of 3.038g. What is the correct empirical formula of the copper chloride?

*September 16, 2015*

**chemistry**

how many kilojoules of energy are required to bring 800.0g water from 20.0c to the boiling point. not sure what formula is? 4.184j

*September 11, 2015*

**8th grade math**

54 beads

*August 31, 2015*

**Algebra**

In the slideshow, Multiplication of rational expressions, located in Chapter 6, the answer results in x in the numerator and x – 5 in the denominator. True or False

*August 10, 2015*

**Chemistry**

For a given reaction, the rate constant doubles when the temperature is increased from 27 o C to 49 o C. What is the activation energy?

*July 21, 2015*

**Math**

If 5X + x squared > 100 then x is not equal to

*July 16, 2015*

**physical science**

40

*June 16, 2015*

**science chemistry**

A given mass of helium(gas)occupies a volume of 3,6m^3 at a pressure of 105 kPa.if the temperature remains constant,calculate volume of the gas if the pressure is decreased to 70 kPa.

*June 14, 2015*

**ELA**

Of i mean

*June 8, 2015*

**ELA**

Oops it's called off mice and men

*June 8, 2015*

**ELA**

the story mice of men... chapter four 1.does crooks believe the men will be able to get their farm?

*June 8, 2015*

**physics**

Three co-linear forces f1=45 N west,f2=63 N east and an unknown force f3 are applied to an object.the resultant of the three forces is 12 N west determine the magnitude and direction of the force f3 using algebraic calculations. Thank you indvance.

*June 3, 2015*

**Math**

trigonometric identities tan^2Ө/sin^2Ө-1=tan^2Ө

*May 27, 2015*

**Biochemistry**

1) 5.89 2) 11.47

*May 16, 2015*

**PHI208 Ethics and moral reasoning**

In what way would Thomas Hill’s notion of “self-acceptance” correspond to Aristotle’s conception of eudaimonia? A. They both are inherently selfish and contrary to virtue. B. They both require the virtues of arrogance and pride. C. Neither has anything to ...

*May 13, 2015*

**Chemistry**

Benzene, C6H6, reacts with nitric acid, HNO3. Two products are formed, one of which is water. The second product has a molar mass of 213 grams. The second product is composed of 33.8% carbon, 1.42% hydrogen, 19.7% nitrogen, and 45.1% oxygen. Write a balanced chemical equation ...

*April 17, 2015*

**physics**

4.0m/s^2

*April 15, 2015*

**Chemistry**

If 30 ml of 02 M HCL with 45 ml what is the molarity of NaOH

*April 9, 2015*

**Physical Science heat & temp. Chapter**

How much heat in calories is required for (2.7 lb) of ice –200 F to be converted to water at 40 F?

*April 8, 2015*

**math**

the perimeter of a rectangle is 35.54 inches longer than the perimeter of a square of side 6.75 inches. Find the perimeter of the rectangle to the nearest tenth of an inch.

*April 7, 2015*

**Physics**

Determine the amount of energy required to raise the temperature of 250 grams of steel from a temperature of 15 oC to a temperature of 40 oC . The specific heat of steel is 0.11 cal/gram oC.

*March 30, 2015*

**math**

sam cut a pie into equal slices. there are only 3 slices left. the angle measure for the three slices is 72 degrees. how many slices did sam cut the pie into?

*March 25, 2015*

**statistis**

73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 In terms of differences in heart rates, interpret these data using the following:the range, (b) the variance, and (c) the standard deviation

*March 23, 2015*

**Chemistry**

3.05 g of hydrated copper sulfate produce 1.94 g of anhydrous salt. Assuming complete removal of water of crystallisation, determine the formula of hydrated copper sulfate.

*March 11, 2015*

**skills ,concepts and atitude**

I took the exam and the answer was correct. Thanks,Ms Sue and Reed

*March 8, 2015*

**skills ,concepts and atitude**

It dose not says

*March 8, 2015*

**skills ,concepts and atitude**

b.

*March 8, 2015*

**skills ,concepts and atitude**

Animal observation and investigations usually begin with A. handling the animal. B. a guiding question. C. feeding the animal. D. an outline of animal behavior. my answer is d.

*March 8, 2015*

**physics**

4.) A 8.0 kilogram physics textbook experiences an applied force of 28.0 Newtons for 2.6 seconds. The resulting acceleration is 3.50 m/s2. Determine the change in the momentum of the book.

*March 4, 2015*

**Science**

90 calories of heat is added to 1 gram of fresh water with an initial temperature of 10 degrees Celcius. What is the final temperature of this liquid? (latent heat of fusion = 80cal/g°C, latent heat of vaporization = 540 cal/g°C)

*February 26, 2015*

**physics**

A 21.0-kg child descends a slide 2.20m high and reaches the bottom with a speed of 1.40m/s . How much thermal energy due to friction was generated in this process?

*February 23, 2015*

**Art**

this is a lie and not real i got a 0 percent on the answers you gave me

*February 16, 2015*

**Maths**

What is the ratio 3:2:1 for 250kg?

*January 20, 2015*

**Math**

a bathroom floor is covered by 15 tiles. each tile measures 18 in. by 18 in. how many floor tiles measuring 6 in. by 6 in. would be needed to cover the same area?

*January 16, 2015*

**algebra**

A Gentoo penguin can swim at a rate of 17 miles per hour. How many miles can a penguin swim in 4 hours? Use the expression rt, where r represents rate and t represents time. How do I put this into an expression?

*December 16, 2014*

**Math**

an employee is hired at a salary of $38560.25 which is 5.5% higher than her salary at her previous job. what was her previous salary?

*December 3, 2014*

**Physics**

If an oil tank that if 15ft tall which is holding oil and water, the water being 8 ft, how much pressure will have when I is opened and begins to flow?

*November 28, 2014*

**6th grade Math**

You probably have to round it to 30.

*November 25, 2014*

**Geometry**

The instructions say, "The measure of an exterior angle of a regular polygon is given. Find the measure of an interior angle. Then find the number of sides. For another problem just like this, they gave the number 18 and I subtracted 18 from 180 and solved it like this, ...

*November 25, 2014*

**Science**

Someone please help me. :( Compare your models of the four haploid cells with those of other groups. Describe and explain any variation that you observe.

*November 20, 2014*

**chemistry**

how many grams of CO are needed to react with 2.90 grams of Fe2O3?

*November 9, 2014*

**statistics**

For a certain yes/no survey question, 55% of the respondents answered “yes”. The null hypothesis is that the population is equally divided on this issue (50% yes and 50% no). The sample size is equal to your age. For a ...

*November 8, 2014*

**math**

consider the sum of 3/5 + 3/4. Round each fraction and estimate the sum. Add the two fractions using a common denominator and then round the result. Which estimate is closer to the actual answer?

*October 27, 2014*

**Paralegal**

Patty is a paralegal at a firm organized as a Limited Liability Partnership (LLP). Joe, the associate attorney, comes to Patty and asks her to bill two clients for the same legal research he conducted, since it was on the same issue and would be useful for both clients. ...

*October 22, 2014*

**physics**

Someone in a car going past you at the speed of 35 m/s drops a small rock from a height of 1.5 m. How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is 9.8 m/s2. Answer in units of m.

*October 21, 2014*

**physics**

A long, straight, current-carrying wire runs from north to south. If you know the direction of the current, how can you determine the direction of the magnetic field? a. Grasp the wire in your right hand with the thumb in the direction of the current, the four fingers will ...

*October 20, 2014*

**statistics**

How could you reword the research hypotheses below to null hypotheses?a. Smoking during pregnancy increases the risk of a child being born prematurely.

*October 14, 2014*

**Algebra**

Find an equation of the line containing the given pair of points (-2,-3) and (-9,-1) in slope-intercept form y=mx+b I think m=-2/7

*September 7, 2014*

**math**

What would be the answer

*September 3, 2014*

**Business Law**

The furniture salesperson tells Paul Weinberg that the table he is admiring is solid cherry. Weinberg purchases the table, then discovers that it is not cherry but another wood stained to look like cherry. Does Weinberg have any legal resources? I said yes but I don't know...

*July 28, 2014*

**stats**

The ABC Self-Concept Inventory has a split-half reliability coefficient of 0.90, and the XYZ Self-Concept Inventory has a Spearman-Brown reliability coefficient of 0.90. If all other factors are equal, which instrument would you choose to use?

*July 26, 2014*

**Business Law**

Becky Friedman, while a minor, buys a cassette recorder for $35. The day after her eighteenth birthday she attempts to return it, claiming it does not meet her needs. Must the seller take back the cassette recorder? Why or why not? I said yes, because a contract involving a ...

*July 25, 2014*

**Physics**

never mind I'm an idiot

*July 11, 2014*

**Physics**

ive added the weight of the 2 painters, then subtracted the weight of the staging?

*July 11, 2014*

**Physics**

A staging that weighs 140 N support two painters, one 500 N and the other 520 N. The reading in the left scale is fl = 740 N. what is the reading Fr in the right hand scale

*July 11, 2014*

**Chemistry**

You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 250ml of 2.00M H2SO4 solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find find a 2.50 liter ...

*July 10, 2014*

**Trig**

Use trigonometric identities to solve the equation csc^2x -(√3+1)cotx+(√3-1)=0 in the interval [0, 2pi]

*May 9, 2014*

**Grade 12 Math**

if a and b are unit vectors, and magnitude of vectors a +b = sq. root of 3, determine (2a-5b) dot (b+3a).

*May 8, 2014*

**math**

Some friends share a pizza.if they cut the pizza into fourths, will the slices be larger or smaller than if they cut the pizza into halves?

*May 8, 2014*

**Science help ASAP**

For everyone at connections academy :) 1. Blood cells are produced in bone marrow 2. His arm muscles work in pairs so that one contracts while the other relaxes to hold his arm in position 3. Both sets of muscles are involuntary an smooth 4. Hollow;strong

*May 5, 2014*

**History**

Can someone please help me? Thanks Select one way World War II changed the roles of women or blacks in the United States and South Carolina. Explain the change you selected. Provide examples of how these events changed South Carolina’s society.

*April 23, 2014*

**math**

Right triangle DEF has sides that measure x, x, and x squared for the some value of x. What is the area of triangle DEF to the nearest 0.1 square unit?

*April 20, 2014*

**History**

Can someone please help me? At least give me an idea. I really need some help I'm far behind and this one is really giving me trouble. Please help. Thanks. Select one reform movement from the Progressive Era. Describe the movement and its impact on South Carolina. Provide ...

*April 17, 2014*

**Investments**

Melissa Popp is thinking about buying some shares of R.H. Lawncare Equipment, at $48 per share. She expects the price of the stock to rise to $60 over the next 3 years. During that time she also expects to receive annual dividends of $4 per share. A. What is the intrinsic ...

*April 15, 2014*

**Physical science**

1) how does the electric force between two oposite charges changes when the distance between the charges is tripled? 2)how does the electric force between two oposite charges changes when the amount of one charge is doubled?

*April 4, 2014*

**Algebra II**

2c+6d=14 1/2c-3d=8

*March 23, 2014*

**Spelling**

What does VCCV and VCV mean in 4th grade words?

*March 17, 2014*

**math**

thanks Ms.Sue

*March 16, 2014*

**math**

please somebody explain the product of 6, and the sum of 4 and 5?I have to show if 6x4+5 is the right answer.

*March 16, 2014*

**math**

An architect was designing a rectangular room with a lenghth of 16ft,a width of 14ft,and a height of 10ft.what is the volume of the room?I added and got 40 cubic feet but not for sure if its right

*March 16, 2014*

**math**

Ms.whittier wrote the following on the board:the product of 6 and the sum of 4 and 5.sherry wrote the following expression,6x4+5.did she write the correct expression?why or why not.

*March 16, 2014*

**stat**

A physician routinely makes physical examinations of children. She is concerned that a three-year-old girl has a height of only 87.8 cm. Heights of three-year-old girls have a mean of 97.5 cm and a standard deviation of 6.9 cm (based on data from the National Health and ...

*March 15, 2014*

**math**

40 x $7.60 = 304

*March 8, 2014*

**UV**

the two lenses in contact are 45 cm away from the object and the distance of the object from the image is 110 cm. if one of the two lenses in contact has a focal length of 15cm, what is the focal length of the second lens? thanks :)

*March 8, 2014*

**physics**

You reach out a second-story window that is 17 m above the sidewalk and throw a 2-kg ball straing upward with 17 J of kinetic energy. Use g = 10m/s^2 Part A) What is the ball's gravitational potential energy when it is released? Use a height measured from the sidewalk. ...

*March 8, 2014*

**physics**

A jet plane takes about 56 s to go from rest to the takeoff speed of 120 mph (miles per hour). What is the average horizontal force that the seat exerts on the back of a 60-kg passenger during takeoff? First make sure that each of the values are in SI units. Use 1 mile = 1609...

*March 8, 2014*

**a**

A compter software retsilor used a matkup ratr of 30%. Find the selling price of a computer game that costs the retsilor 15 dollard

*March 5, 2014*

**physics**

An astronaut in full gear has a weight of 2900 N on Earth. Jupiter; weight on planet relative to earth is 2.53 and weight of a 150-lb person is 380. How much will the astronaut weigh on the Jupiter? W_{Jupiter} =________________ N Neptune; weight on planet relative to earth ...

*March 3, 2014*

**math**

sec tangent= 2 square root of 3/3 and sin tangent= -1/2; find cot tangent

*March 3, 2014*

**physics**

A planet has a radius of about 0.85 times Earth's radius and a mass of only 0.74 times Earth's mass. Estimate the acceleration due to gravity on the planet. Use M_{Earth} = 5.972 x 10^{24} kilograms and r_{Earth} = 6370 kilometers a_{planet} = ________________{m}/{s^2...

*March 3, 2014*

**physics**

The acceleration due to gravity on a certain planet is about 6.5 \frac{m}{s^2}. What would a 78-kg scientific instrument weigh on Titan? W_{instrument} =______________ N (no rounding up)

*March 3, 2014*

**physics**

A 470-kg satellite experiences a gravitational force of 850 N. Use M_{Earth} = 5.972 x 10^{24} kilograms and r_{Earth} = 6370 kilometers What is the radius of the satellite�s orbit? r_{orbit} = _____________kilometers What is its altitude? altitude = ...

*March 3, 2014*

**physics**

The gravitational force between two metal spheres with the same masses are in outer space is 60 N. How large would this force be if the masses of each sphere were cut to a fourth of its original value? F_{attractive} =_____________ N (no rounding up)

*March 3, 2014*