# rebecca

Newest questions and responses by rebecca-
## Science

In witch type of symbiotic relationship is one organism helped while another organism is neither benefited nor harmed?

*asked on February 26, 2019* -
## Biology

List 2 local biomes communities found in Nigeria

*asked on January 18, 2019* -
## math

1.A flywheel is rotating at 7 rad/sec. It has a 15-cm diameter. What is the speed of a point on its rim, in cm/min? 2.A wheel is rotating at 3 radians/sec. The wheel has a 30 cm radius. What is the speed of a point on its rim, in m/min? 3.What is the

*asked on January 14, 2019* -
## math

1. A flywheel is rotating at 7 rad/sec. It has a 15-cm diameter. What is the speed of a point on its rim, in cm/min? 2. A wheel is rotating at 3 radians/sec. The wheel has a 30 cm radius. What is the speed of a point on its rim, in m/min? 3. What is the

*asked on January 9, 2019* -
## Math

A company producing steel construction bars uses the function R(x) = -0.06x²+10.2x -50 to model the unit revenue in dollars for producing x bars. For what number of bars is the revenue at a maximum? What is the unit revenue at that level of production?

*asked on December 17, 2018* -
## Physics

How much power is required to lift a 25kg box to the top of a 4 meter flight of stairs in 3.5 seconds

*asked on November 24, 2018* -
## Math

The owner of the Good Deals Store opens a new store across town. For the new store, the owner estimates that, during business hours, an average of 90 shoppers per hour enter the store and each of them stays an average of 12 minutes. The average number of

*asked on September 28, 2018* -
## chemistry college

Give two advantages and two disadvantages to using the biuret reaction to measure protein concentration compared to measuring the protein absorbance directly at 280nm.

*asked on September 27, 2018* -
## algebra

8y=7+14x 18y-2=-7x

*asked on July 4, 2018* -
## Language arts

You meet Tock and Hambug in Act I of The Phantom Tollbooth. In Act II, you see them in action and hear more of what they have to say. How are the two characters alike? How are the two characters different? What do they do to help Milo? tell two ways for

*asked on March 15, 2018* -
## AP Chemistry

A 0.3500 MHCl solution was used to titrate a 21.60 mL sodium acetate solution. The endpoint was reached after 25.75 mL of titrant were added. Find the molar concentration of sodium acetate in the original solution.

*asked on February 4, 2018* -
## AP Chemistry

A 0.2500 M NaOH solution was used to titrate a 16.85 mL hydrofluoric acid solution. The endpoint was reached after 31.20mL of titrant were added. Find the molar concentration of hydrofluoric acid in the original solution.

*asked on February 4, 2018* -
## AP Chemistry

A 2.685 g sample of KHC8H4O4 was dissolved in water and uses to standardize a NaOH solution. The endpoint was reached after 38.25mL of titrant were delivered. Find the molar concentration of the NaOH solution.

*asked on February 4, 2018* -
## AP Chemistry

A 0.500 M HNO3 solution was used to titrate a 21.15 mL KOH solution. The endpoint was reached after 22.30 mL of titrant were delivered. Find the molar concentration of KOH in the original solution.

*asked on February 4, 2018* -
## AP Chemistry

A 0.250 M NaOH solution was used to titrate a 19.75 mL HI solution. The endpoint was reached after 32.95 mL of titrant were delivered. Find the molar concentration of HI in the original solution.

*asked on February 4, 2018* -
## AP Chemistry

A 30.75 mL sample of 0.450 MKOH was titration with an unknown concentration of HCl. The endpoint was reached when 29.35 mL of NaOH were delivered. Find the concentration of the titrant

*asked on February 4, 2018* -
## History

Which of the following statements most accurately analyzes how the Philadelphia Convention shaped the new national government?

*asked on December 6, 2017* -
## History

How did the legal opinion of John Marshall shape the US government?

*asked on December 6, 2017* -
## procurement and supply

why is purchasing an external resource management?

*asked on November 8, 2017* -
## Algebra help??!!

I'm really confused with sets, could someone please check my answer?? I just really don't want to get it wrong... You have two boxes of colored pens, The first box contains a red pen, a blue pen, and a green pen, The second box contains a yellow pen, a red

*asked on October 19, 2017* -
## math

help!!!!!!!! with finding of the zeros of this function f(x)= -x^3-2x^2+9x+18.

*asked on October 17, 2017* -
## chemistry

a )what use of carbon , properties of carbon? b) is their any organic compound that synthsies like urea in lab?

*asked on October 8, 2017* -
## Chemistry

Hello.Need your help guys.Burning 2g of vitamin c yields 3g and 0.82g of CO and water respectively.What is the empirical formula of vitamin c and molecular mass if the molar mass is 264g/mol?

*asked on September 24, 2017* -
## Physics

Help with this please. No idea. Except for a 22.00 min. rest stop, Emily drives with a constant velocity of 89.5 km/hr north. How long does the trip take if Emily's average velocity is 77.8 km/hr north?

*asked on August 13, 2017* -
## Chemistry

When you label distillation apparatus, is the condenser the same as the water jacket? Thanks

*asked on June 23, 2017* -
## Chemistry

[Cu(H2O)6]2+ (aq) + 2OH- --> Cu(OH)2 (s) + 6 H2O (l) What would the full equation be for this, rather than the ionic one? I understand that OH- becomes NaOH but where does the Na go on the right hand side? Thanks

*asked on June 7, 2017* -
## Maths

Does squaring a function affect the asymptotes? For example, if you square the function 1 over x + 3 does it change the asymptotes that were y = 0 and x = -3? Thank you!

*asked on June 2, 2017* -
## Chemistry

Would glacial ethanoic acid have (l) or (aq) state symbol? I'm thinking liquid as it doesn't contain any water but would just like to confirm as struggling to find any equations involving it online? Thank you :)

*asked on May 20, 2017* -
## Chemistry

How many lone pairs does Cl- have? I can draw it using a cross and dot diagram but not sure if it would have 4, or 3 as one of the electrons has been added from somewhere to make it an ion? Thank you!

*asked on May 10, 2017* -
## algebra

Problem Page The volume V of a fixed amount of a gas varies directly as the temperature T and inversely as the pressure P. Suppose that V=42 cm to the 3,when T=84 kelvin and P= 8kg over cm squared. Find the temperature when V=74 cm cubed and P= 10 kg over

*asked on March 14, 2017* -
## physics

A solid sphere of radius 35 cm is positioned at the top of an incline that makes 20 ◦ angle with the horizontal. This initial position of the sphere is a vertical distance 3.4 m above its position when at the bottom of the incline. The sphere is released

*asked on March 9, 2017* -
## Chemistry

Consider equation 3A+B=C+D. You react 4 moles of A with 2 moles of B. Which of the following is true? 1) Limiting reactant (L.R.) is one with higher molar mass 2) A is L.R. because you need 6 moles of A and have only 4 moles 3) B is L.R. because you have

*asked on February 1, 2017* -
## Social Studies

Who's job is it to line up the votes of the members of the party that holds the most seats in a chamber? A) president pro tempore B) Speaker of the house C) Minority whip D) majority whip **** The president of the Senate also serves as the _____? A) Head

*asked on January 19, 2017* -
## Physics

Your 2000 kg car is going 40 m/s on the highway when you see a police car up ahead. You apply the maximum 10000 N of brake force to slow your car down to the speed limit of 30 m/s. How many seconds will it take you to get down to the speed limit?

*asked on December 6, 2016* -
## Mathematics

Tom deposits $800 into an account that pays simple interest at a rate of 2℅ per year. How much interest will he be paid in the first 2 years

*asked on December 5, 2016* -
## Chemistry

If you try to carry out a double displacement reaction by mixing together equal volumes of a solution that contains dissolved NaF and a solution that contains dissolved NaCl. Would you expect a reaction? Why or why not?

*asked on November 28, 2016* -
## Math

The admission to a local fair is $10 for an adult and $6 for a child. Each ride costs $1.50 for and adult and $1 for a child. Write an expression that represents how much more an adult will spend.

*asked on November 8, 2016* -
## Calculus I

(Six pigpen problem). A 2 × 3 array of six congruent rectangular pigpens (that all look the same from above) will be in the overall shape of a rectangle R. We may use 100 feet of fencing to form the boundaries of the pigpens. Find the dimensions for a

*asked on October 28, 2016* -
## Chemistry

How many grams of H2O are required to react with excess CaC2 to produce 23.0 g of C2H2 according to the following equation? CaC2 + 2H2O -> Ca(OH)2 + C2H2 a.4.5 b.15.9 c.31.8 d.1.766 I think this equation works out by multiplying 2 moles by the molar mass

*asked on October 27, 2016* -
## Chemistry

If 3.60 moles of SiO2 and 3.60 moles of C react to form SiC accodring to the equation SiO2 + 3 C -> SiC + 2 CO how many moles of CO will be produced? a. 1.20 b.2.40 c.3.60 d.7.20 -Do I have to use SiC in any part of the equation, I am very confused and I

*asked on October 27, 2016* -
## carson high school

solve by elimination 5r-3s=19 2r-6s=-2

*asked on September 29, 2016* -
## Science

Can someone please explain how to do dot and cross diagrams. Thanks

*asked on September 27, 2016* -
## Math

Melissa collected 3 kinds of autumn leaves when she was walking today- Elm,maple, and oak. She has 2 times as many maple leaves as elm leaves. Altogether, she has 32 leaves. How many of each kind does she have?

*asked on September 17, 2016* -
## Algebra

At a concession stand, three hot dogs and four hamburgers cost $12.00; four hot dogs and three hamburgers cost $10.75. Find the cost of one hot dog and the cost of one hamburger.

*asked on August 14, 2016* -
## Physics

A hollow sphere starts from rest and rolls down a hill without sliding. At the bottom of the hill, it has a linear velocity of 5 m/s. What was the height of the hill the sphere rolled down (in meters)?

*asked on July 27, 2016* -
## conclusions - check answer

Which of the following is a true statement about writing introductions of rough drafts? A. Do not worry about the central point of your essay; it will happen later on as you revise your paper. (MY ANSWER) B. Pay close attention to the correct spelling of

*asked on July 5, 2016* -
## conclusions

What function do conclusions serve in essays? A. Conclusions provide the supporting details of an essay. B. Conclusions develop the main idea of an essay. C. Conclusions sum up the main idea of an essay. (MY ANSWER) D. Conclusions introduce new ideas

*asked on July 5, 2016* -
## English Check answers

Transportation Strike Disrupts Westridge Thousands unable to get to work or school WESTRIDGE, Ohio—More than 600 transportation employees went on strike at midnight last night after the Westridge City Council rejected their demand for a 10% pay increase.

*asked on June 30, 2016* -
## English

Is this paragraph’s main idea stated or implied? The greatest gift the Sumerians gave the world was the invention of writing. The Sumerians were a wealthy people. They needed some way to keep track of what they owned. They began drawing pictures. They

*asked on June 24, 2016* -
## History

How did nationalism threaten the existing political order of the nineteenth century?

*asked on June 8, 2016* -
## Algebra 2

What is the solution set to the following system? x + y = 5 and x^2 + y^2 = 25 A) (0,-5) (-5,0) B) (0,5) (-5,0) C) (0,-5) (5,0) D) (0,5) (5,0)

*asked on June 5, 2016* -
## math

A credit card company charges 7% simple interest. What is the total interest on a $1,900 loan at the end of two years?

*asked on May 26, 2016* -
## math

If the first term in an arithmetic sequence is 15 and the tenth term is 69. What is the fourth term in the sequence?

*asked on May 25, 2016* -
## math

A ball is dropped from a height of 256 ft. With each bounce, the ball reaches a height that is half the height of the previous bounce. After which bounce will the ball rebound to a maximum height of 1 ft?

*asked on May 13, 2016* -
## #3 Fitness (Check answers)

1) The first step in the decision-making process is to brainstorm all possibilities (my answer) evaluate the result act realize there is a problem 2) Evidence that you have accomplished a goal is an example of which step in the SMART goal method? specific

*asked on April 25, 2016* -
## Fitness (Check answers)

6) Gang member often have weapons and are involved in violence. TRUE OR FALSE ~ (my answer is TRUE) 7) Being disruptive in class and getting angry easily could be sign of abuse. TRUE OR FALSE ~ (my answer is FALSE) 8) People with high self-esteem are prone

*asked on April 25, 2016* -
## Fitness (Check answers)

1) Sitting in class wearing ear buds during a lecture is effective listening. TRUE OR FALSE ~ (my answer is FALSE) 2) Defense mechanisms should be used as often as possible to deal with uncomfortable emotions. TRUE OR FALSE ~ (my answer is FALSE) 3) Daily

*asked on April 25, 2016* -
## Maths!

Suppose you draw 4 gumballs from the jar without replacement. Is it more likely that you will draw exactly 1 marble of each colour or is it more likely that you will not draw exactly 1 of each colour?

*asked on April 21, 2016* -
## math

Esme is going on a holiday with 13 friends. The total cost of the holiday is £5999.00 How much does Esme have to pay?

*asked on April 16, 2016* -
## math

Robert is going to cut seedling support stakes from a piece of wood measuring 175 centimeters. Each support stake will be 12 centimeters in length. How many support stakes can Robert cut?

*asked on April 16, 2016* -
## Maths

Find the sum of the following series: 1024 - 512 + 256 - 128 +...+ 1 So a = 1024, r = -0.5, but I need to know what n is in order to use the formula. So I tried ar^(n-1) which is: 1024(-0.5)^n-1 = 1 but I don't know how to find n from there. Thanks in

*asked on April 7, 2016* -
## 4th grade math

please help!! I have no idea how to do these I am trying to help my son.. Find two mixed numbers so that the sum is 21 1/6 and the difference is 4 3/6?

*asked on February 21, 2016* -
## math

a liscense plate that has 3 numbers from 0-9 and 2 letters where each number and a letter may be used more than once. Find the Fundamental Counting Principle to find the number of outcomes in the situation

*asked on February 9, 2016* -
## magh

a liscense plate that has 3 numbers from 0-9 and 2 letters where each number and a letter may be used more than once. Find the Fundamental Counting Principle to find the number of outcomes in the situation

*asked on February 9, 2016* -
## Social Studies

John Locke: In his book Two Treatises on Government, Locke refuted the divine right of Monarchy, and established a theory which states that all men are men are born free and equal. Each person should have equal access to the natural rights of life,

*asked on February 2, 2016* -
## Math

There are 6 periods in each working day of a school. In how many ways can one organize 5 subjects such that each subject is allowed at least one period?

*asked on January 13, 2016* -
## math

How many 3 digit numbers can be formed from the digits 2,3,5,6,7 and 9 which are divisible by 5 and none of the digits is repeated?

*asked on January 13, 2016* -
## algebra

x^-2y+6z^-1 add. write the answer with all exponents positive

*asked on January 12, 2016* -
## math

a ski club planned a trip to su valley, and 38 of the members signed up. if 80% of the members did not sign up, how many members did the club have

*asked on January 12, 2016* -
## Physics

Sarah walks 300 m North ,50 m East and then she walks 300 m South. What is the displacement? Thanks in advance too!!

*asked on January 12, 2016* -
## PHYSICS

An object is initially moving in the positive direction of an x-axis with a speed of 2.7 m/s. If the constant acceleration of the object is -0.12 m/s2, what distance will it have traveled when it turns around?

*asked on December 18, 2015* -
## physics

3. Only two forces act on an object. The magnitude of the first force is 25 N and it acts at an angle of +25° with the positive x-axis. The second force acts at angle of -73° with the positive x-axis. The acceleration of the object is parallel to the

*asked on December 15, 2015* -
## Math

ABC and def are equal both are 5:1 what's edf C is 47° triangle is the shape

*asked on December 3, 2015* -
## Math

Tony hikes the woods 6.6 miles on a map 1cm=12 miles what on map representation hiking trail

*asked on December 3, 2015* -
## Math

2:7 small shape is 16,22,28 feet what's what's the perimeter of big shape

*asked on December 3, 2015* -
## Math

If a pole cast a 20 foot shadow and a tree that's 8 foot cast a 5ft shadow how tall is the pole also tell me how you solved it

*asked on December 3, 2015* -
## Physics

How do you find final kinetic energy?

*asked on November 30, 2015* -
## Physics

In a car crash, Car A rear ends Car B that stopped at a red light. After the crash, Car A and Car B meld together moving at a speed of 14 m/s. Car A has a mass of 1750 kg. Car B has a mass of 2000 kg. Calculate the initial momentum of Car A. So far I have

*asked on November 30, 2015* -
## Physics

How far above the surface of the earth would you have to be before your weight is reduced by 13.52%?

*asked on November 12, 2015* -
## Physics

Find the minimum initial speed of a projectile in order for it to reach a height of 2022 km above the surface of the earth.

*asked on November 12, 2015* -
## Chemistry 218

assume all of the ionized aspirin remains in the buffer solution and all of the un-ionized aspirin goes into to the ethyl acetate, what is the molarity of the aspirin in the ethyl acetate at pH 2 and pH 8? what equation would ou use for this?

*asked on October 28, 2015* -
## Math

What is 4 to the power of 3 plus 3? I got 67.

*asked on September 30, 2015* -
## Chem

Suppose the water sample has a relatively high percent of volatile solid material. How would this have affected the reported mass of: a. dissolved solids -- too high, too low, or unaffected? Explain. TDS will be unaffected b. total solids -- too high, too

*asked on September 30, 2015* -
## Chem

Name the following binary compounds consisting of two nonmetals or a metalloid and a nonmetal. 1. AsH3= arsine 2. AsF5= arsenic pentafluoride 3. HCL= Hydrogen chloride is this right?

*asked on September 29, 2015* -
## Chemistry

Hello! I really need help with this. Name the following salts according to the old -ic, -ous system and the stock system. a. CrS b. Cr2O3 c. CrI3 X 6H20 d. CuCl e. CuI2 f. CuBr2 x 4H20 g. HgCl2 h. Hg2Cl2 i. Fe (OH)3 I am totally lost. I don't know how to

*asked on September 29, 2015* -
## CHEMISTRY

IS THIS RIGHT? Name the following binary acids: HF(aq) – Hydrofluoric Acid HCl (aq)– Hydrochloric Acaid H2Se(aq) – Hydroselenide Acid HBr(aq) – Hydrobromic Acid HI (aq)– Hydroiodic Acid H2Te (aq)- hydrotelluric acid

*asked on September 29, 2015* -
## chem

name the following binary acids. is the name for K2S, potassium sulphide or potassium sulfide? and is the name for K2Te, potassium telluride?

*asked on September 29, 2015* -
## precalc

3- l2x-4l is less than or equal to 1 are the values of x x is greater than or equal to 3 x is less than or equal to -3

*asked on September 27, 2015* -
## precalc

i also need help with these two questions: 1/r=1/r1 +1/r2 solve for r1 and: f= G(mM/r^2); solve for m

*asked on September 27, 2015* -
## precalculus

hello there! i wanted to check my answer. is: 2(x-y) / (radical x- radical y) = 2 radical x + 2 radical y? thanks so much for your help!

*asked on September 27, 2015* -
## Physics

Determine the direction of frictional forces (left, right, up down) for the objects: 1) A cup resting on top of a car. The car is moving and accelerating to the right. Up - This one I'm not sure but I think up because the frictional force would have to go

*asked on September 16, 2015* -
## Physics

A bicycle racer sprints near the end of a race to clinch a victory. The racer has an initial velocity of 10.3 m/s and accelerates at the rate of 0.370 m/s2 for 7.01 s. What is his final velocity? a) 12.9 m/s The racer continues at this velocity to the

*asked on September 15, 2015* -
## Math 104

A belt connects two pulleys with radii 2 in and 4 in.. The velocity of point A on the belt is 25 ft/sec. What is the linear velocity and angular velocity for point B? What is the linear velocity and angular velocity for point C?

*asked on September 15, 2015* -
## algebra

Suppose that the width of a certain rectangle is 1 inch more than one-fourth of its length. The perimeter of the rectangle is 32 inches. Find the length and width of the rectangle.

*asked on September 8, 2015* -
## math

How many 2 1/4 feet long strips of ribbon can be cut from a ribbon that is 7 1/2 feet long

*asked on September 4, 2015* -
## life orientation

assess the extent to which bad road use has a direct impact on the physical, emotional, social and economic aspects to the family, the community and the country.

*asked on August 12, 2015* -
## Setlhwane

Maths lit,life science,agricultural science,geography.....can i qualify for law school with this high school subjects?

*asked on July 14, 2015* -
## Algebra

what is (1.4*10^1)(8*10^4) in scientific notation?

*asked on June 7, 2015* -
## Algebra

I have a few questions on my Pre- Algebra Pre- test. I am in 7th grade. Anyone willing to help me for a few questions for 5-10 minutes?

*asked on June 7, 2015* -
## History

1) Which of the following best describes Affirmative Action? a) It was a way to fight corruption within the US government. b) The actions taken to instill new anti immigration laws. c) Of solving economic and educational discrimination. d) Of solely

*asked on May 13, 2015*