# laura

Newest questions and responses by laura-
## physics

Now, three masses (m1 = 3.1 kg, m2 = 9.3 kg and m3 = 6.2) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above. x = 9cm What is the magnitude of the force the bottom spring exerts on the

*asked on October 14, 2018* -
## math

how to find the greastest common factor

*asked on October 2, 2018* -
## geometry

TU=1-x,UB=4x+17,TB=-3x

*asked on August 27, 2018* -
## MATH

a borrower received a 30 year ARM mortgage loan for 200,000. Rate caps are 3/2/6 the start rate is 3.50% AND the loan adjusts every 12 months for the life of the mortgage, The index used for this mortgage is LIBOR which for this exercise is 3% at the start

*asked on May 19, 2018* -
## chemistry

0.1 mol of HCl is added to 1 L of water. What is [H+] and [OH-]? Thank you!

*asked on May 13, 2018* -
## earth science

An element's atomic number is 52. How many electrons would an atom of this element have?

*asked on May 4, 2018* -
## earth science

If the mass of a material is 76 grams and the volume of the material is 23 cm3, what would the density of the material be?

*asked on May 4, 2018* -
## earth science

An atom of element A has 75 protons. What would the element's atomic number be?

*asked on May 4, 2018* -
## statistics

The J.R. Simplot Company produces frozen French fries that are then sold to customers such as McDonald's. The "prime" line of fries has an average length of 6.00 inches with a standard deviation of0.50 inch. To make sure that Simplot continues to meet the

*asked on May 2, 2018* -
## physics

A 1500-kg wooden roller coaster car traveling at 15 m/s approaches the loading station where the under-track brake strips are pneumatically actuated to slow the car to a stop in 10m. What is the work done on the car by the brakes? What is the retarding

*asked on April 10, 2018* -
## Physics

A 10-kg crate is pulled along a horizontal floor by a constant force exerted by a person, Fp = 80N, which acts at a 45◦ angle. The floor is rough and there is a kinetic friction force of 4.1 N acting on the crate as it slides. The crate is pulled for a

*asked on April 9, 2018* -
## Science

In the new six kingdom system of classification, the six kingdoms may be grouped into three domains. The four kingdoms that are grouped in the domain Eukarya all contain organisms A) are consumers. B) are multicellular. C) that have cell walls made of

*asked on March 28, 2018* -
## algebra

Find the coordinates of the circumcenter for ∆DEF with coordinates D(1,1) E (7,1) and F(1,5). can you please explain how i can find this answer? i am having trouble

*asked on March 14, 2018* -
## math

What is the acceleration of the particle the first time its velocity equals zero? s(t)= -4sin(t) - (t/2) +10 What is the acceleration of the particle the first time its velocity equals zero? −5.197 0.745 1.323 2.550 3.969 Could somebody write out the

*asked on February 25, 2018* -
## World Literature

Hi I really need help with the following questions. 1. In"My heart leaps up when I behold"Wordsworth says " the child is the father of the man" This is often interpreted to mean that our childhood experiences influence the adults that we become. Explain

*asked on February 20, 2018* -
## Frequency table

how do I figure this one I am working with excel 2016 Gender 1 2 1 1 1 2 2 1 1 2 2 2 2 2 1 1 1 2 2 1 1 1 2 1 2 2 1 2 2 2 1 2 1 1 1 1 2 2 1 2 1 1 2 2 2 2 1 1 2 2 Age 29 32 39 25 27 33 36 28 34 32 31 38 27 29 26 39 40 37 37 29 29 30 36 30 30 35 27 31 38 38

*asked on February 13, 2018* -
## Algebra

Hi can some one please help me simplify the expression and solve the equation. v^2+6v+8/v^2+v-12 divided by v+2/2v-6 thank you.

*asked on January 30, 2018* -
## math (trig)

Given tan 0 = -5/12 determine the possible values of 0 to the nearest hundreth So what I did is find that tan-1(5/12) equals 0.35. Then because tan can be negative in quadrants 1 and 3 subtract 0.35 from pi and then from 2pi. So I got 2.79 and 5.933 I'm

*asked on January 29, 2018* -
## math (log)

Express as a single logarithm 2log3 + 4log2 I'm confused as to how to do this, I keep getting the wrong answer. Thank you!

*asked on January 29, 2018* -
## math (trig)

For the following value of cos 0, determine the rad value of 0 for pi < 0 < 2pi (greater than or equal to pi and 2pi) -1/2 I don't understand I found out that the inner circle val is pi over 3. But I can't work out how to find 0

*asked on January 28, 2018* -
## math (trigonometry)

A ferris wheel has a diameter of 100m and the bottom of the wheel is 4m above the ground. It rotates two times every 10 minutes. Using this information, complete each question. c) Determine the angular velocity of the Ferris wheel in radians/second d)How

*asked on January 28, 2018* -
## Math (pre-calc)

36^(2x+4) = (square root of 1296)^x Solve for x I'm really stuck on this one too, thank you for your help

*asked on January 25, 2018* -
## Math (pre-calc)

log2(log4x) = 1 Solve the equation The bases are 2 and 4 respectively, I'm just not sure how to signify that on the keyboard. Thank you so much, help is really appreciated.

*asked on January 25, 2018* -
## Math

Solve the inequality algebraically: 5/x-3 + 3/2-x > 1 (greater then or equal to one) I know how to do it in theory but I keep getting the answer of just y=2 and I know that can't be right. Help is really appreciated! Thank you

*asked on January 25, 2018* -
## Biology

Hi can someone please help me with this? What are the major advantages and disadvantages of an arthropod's exoskeleton? For the advantages I have provides framework for support, protects soft body tissue and slows water loss in animals that live on land.

*asked on January 24, 2018* -
## Probability

Richard is playing a game where he draws one playing card each out of two stacks of four cards. Is Richard more likely to draw two cards with a product that is an even number or two cards with a product that is a single digit? A. Richard is equally likely

*asked on January 16, 2018* -
## Math

How do you solve Log3(log9x) = 1 I honestly have no idea I can't figure it out :(

*asked on January 11, 2018* -
## Algebra

15. find the x-intercept by factoring. y=x^2-4x-32 here is what i have (x+4)*(x-8) =0 x=-4 x=8. 16. show how the value of the discriminant supports your conclusion from question 15. 17. How does the axis of symmetry relate to the x-intercept. Thank you for

*asked on November 29, 2017* -
## math

The height of a square-based box is 4 cm more than the side length of its square base. If the volume of the box is 225 cm3. What are its dimensions? So this is what I did: v = l x w x h v = 1x x 1x x (x+4) v = 2x^2 + 8x 225 = 2x^2 + 8x 2x^2 + 8x - 225 = 0

*asked on October 24, 2017* -
## math (please help, test tmrw)

Determine a possible linear function f(x) such that x^2-x-2 < f(x)< x^3-x^2-2x has a solution and state the solution.(the < are supposed to have lines under that indicate less than/equal to) I just don't really get what it's asking. So I factored each

*asked on October 24, 2017* -
## cultural anthropology

Hi, I am trying to come up with some examples and was hoping to get some help. I need 2 examples comparing anthropology with history and sociology. I just can't think of anything. Any help pointing me in the right direction would be great, thanks

*asked on October 2, 2017* -
## Cultural Anthropology

Describe social groups in general and then compare/contrast with 3 different types of social groups.

*asked on September 25, 2017* -
## Cultural Anthropology

Describe gender equality as it exists in different cultures and 2 examples. Describe US culture and relate to one example above

*asked on September 25, 2017* -
## Culural Anthropolgy

Describe the role that anthropologists play in migration with three examples

*asked on September 25, 2017* -
## Cultural Anthropology

Describe 2 key differentiators with 2 examples about anthropology compared to history and sociology

*asked on September 25, 2017* -
## Cultural Anthropology

Provide 2 reasons with 2 examples: why it is important to have a strict code of ethics in anthropology and other social sciences compared to more purely scientific disciplines such as chemistry or physics.

*asked on September 25, 2017* -
## Algebra

Passenger train leaves 2 hours after a freight train leaves. The freight train travels 14 mph slower than the passenger train. Find the rate of each train if the passenger train overtakes the freight train in 3 hours. I did this : 5r=3(r+14) 5=3r+28 2r=28

*asked on September 22, 2017* -
## School

What is the best description of an advanced placement course? A. a rigorous version of a regular subject B. a course that is consistent with college/university courses and prepares a student to take AP exams in a particular subject area and opt out of

*asked on September 20, 2017* -
## Algebra

1. Graph the linear inequality. y≤4x 2. Graph the linear inequality. 4x+5y≤20

*asked on September 14, 2017* -
## math

Find the indicated term of the geometric sequence.

*asked on May 17, 2017* -
## Physics (I have a test tomorrow)

What power is required to accelerates a 1980kg car from 30km/h to 70km/h against a constant force of resistance of 750N over a distance of 85m. Thank you for your help!

*asked on May 2, 2017* -
## Physics

A tow truck pulls a car from rest onto a level road. The tow truck exerts a horizontal force of 1500 N on the car. The frictional force on the car is 810 N. Calculate the work done by each of the following forces on the car as the car moves forward 12 m:

*asked on May 1, 2017* -
## Physics (I have a test tmrw)

The half-life of Strontium-90 is 28 a. If 60 g of this isotope is currently in a sample of soil, estimate the amount in the same sample 84 a later. So I did a=60g(1/2)^84/28 But I don't know if thats correct. Thank for your help!

*asked on May 1, 2017* -
## chemistry

some pollutants in natural waters such as heavy metal and organic compounds would be classified as having low solubility.what are some origins of pollutants in natural waters? if some are low solubility compounds, why are these a problem? Hello, I just

*asked on April 25, 2017* -
## chemistry (I have a test tomorrow)

4 Ag + 2 H2S + O2 = 2 Ag2S + 2 H2O a) What mass if silver sulfide is formed from the reaction of 0.120g of silver? b) What mass of hydrogen sulfide is needed in the same process? So I understand a, and I found the answer to be 0.138g. For b the text book

*asked on April 13, 2017* -
## Math

Sean spent 1/5 of his money in the shop and 7/10 IN another what fraction of his money is left

*asked on April 5, 2017* -
## Calculus II

I need to find if the summation of (n^4)/(n^10 + 1) is convergent or divergent from n=1 to infinity. I tried splitting it up into two sums, one being 1/n^6, which would be convergent because p=6>1, and then the other being n^4, but I'm not sure how to know

*asked on April 4, 2017* -
## Physics

A 240 kg roller coaster car Rolls over the crest of the roller coaster with a speed of 2.2m/s.if it falls through a vertical height of 12m down the tracks to the bottom of a trough, how fast will it be travelling? So here's what I did but I don't think

*asked on March 27, 2017* -
## Physics

A 55kg arrow is fired vertically upward at a speed of 42m/s. It rises upwards, then drops and lands on the ground. If it lodges itself 12cm in the ground, determine the average force that the ground exerts on the arrow This is what I've done but I don't

*asked on March 26, 2017* -
## Financial maths year 9

Sophie borrowed $2000 at a simple interest rate of 15% for 3 years to repay the loan and has $900 in interest. If Sophie's interest was calculated at the same rate on the balance owing, how much would she have owed after 6 months if she repaid $40 per

*asked on March 2, 2017* -
## Maths

How many weeks will it take for 50 000 to earn 1500 in interest if the rate is 6% p.a.

*asked on March 2, 2017* -
## Laws of Physics

A block and tackle has a velocity of 6 and it is being used to raise a mass of 68 newtons through 3 meters. The efficiency is 60% Calculate the amount of energy needed to lift the mass through 3 meters and calculate the amount of energy that was put into

*asked on February 18, 2017* -
## Math

An investment is initially worth $11,100. Write a formula for the function V(t) representing the value of this investment after t years in each of the following situations: A) The value decreases by $889 per year. B) The value increases by $899 per year.

*asked on February 15, 2017* -
## Chemistry

You add 3.5 L of an HCl solution of unknown concentration to 2.0 L of 0.5 M HCl and 4.5 L of water. The final concentration of HCl was 1.5 M. What was the unknown concentration of the initial HCl solution?

*asked on February 12, 2017* -
## math

a bag of chips weigh eight ounces how many bags of chips weigh 12 pounds

*asked on January 31, 2017* -
## applied calculus

From a height of 25 meters a ball is thrown vertically upwards at a velocity of 5 meters per second. a.What time in seconds will the ball reach its maximum height? b.What is its maximum height? c.When will the ball strike the ground? d.What will be the

*asked on January 30, 2017* -
## Math

At what point of the curve y= x^4 is the normal line parallel to 2x + y = 3? Find the equation of the normal line.

*asked on January 30, 2017* -
## Pre Calc

The Department of Foreign Languages of a liberal arts college conducted a survey of its recent graduates to determine the foreign language courses they had taken while undergraduates at the college. Of the 500 graduate 207 had at least one year of Spanish.

*asked on January 15, 2017* -
## Pre Calc

Evaluate the quantity. 4 · P(4, 4) · C(9, 5)

*asked on January 15, 2017* -
## Pre calc

Find the point of intersection of the pair of straight lines. 2x + 4y = 19 −3x + 3y = 3

*asked on January 5, 2017* -
## pre calc

Find the point of intersection of the pair of straight lines. y = −5x − 4 −y = 6x + 3

*asked on January 5, 2017* -
## Physics Equilibrium

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 (μe). The frictional force of the wall on the board may be neglected. Find an expression for the maximum value

*asked on December 14, 2016* -
## Math Help

Given the functions of f(x)=(x-3)/(x9), g(x)=9x+3, find (gof)(x).

*asked on December 13, 2016* -
## Chemistry

How do orbitals on individual atoms interact and change when covalent bonds form in molecules?

*asked on December 5, 2016* -
## math algebra

The amount A, of 70 grams of a certain radioactive material remaining after t years can be found by the equation A=70(0.62)^t. When will 10 grams remain?

*asked on December 1, 2016* -
## math algebra

the product of two consecutive even numbers is 440. What is the sum of the numbers?

*asked on December 1, 2016* -
## Math Logs

logbase4(x+5)=3+logbase4(x-2) Tried so many times please help!

*asked on November 30, 2016* -
## math algebra

The lengths of the three sides of a right triangle are given by three consecutive even integers. Find the lengths of the tree sides.

*asked on November 30, 2016* -
## physics

a simple pendulum of lengh l,the mass of whose bob is m,is observed to have a speed v0 when the cord makes an angle theta0(0

*asked on November 30, 2016* -
## physics

a simple pendulum of lengh l,the mass of whose bob is m,is obseved to have a speed v when the cord makes an angle with the vertical.Determine the least value v2 that v could have if the cord is to achieve a horizontal position during the motion

*asked on November 30, 2016* -
## inverses

You have 700 sq ft of plywood to make the stage floor. Use A^-1(x) to find the dimensions of both the runway and the main part of the stage. main stage is a rectangle and runway is a square. length of the main stage is 3x o f the runway, the width of the

*asked on November 28, 2016* -
## runways and inverses!

You have 700 sq ft of plywood to make the stage floor. Use A^-1(x) to find the dimensions of both the runway and the main part of the stage. main stage is a rectangle and runway is a square. length of the main stage is 3x o f the runway, the width of the

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

your school is putting on a prom fashion show, and you are in charge of building a platform to serve as a stage. Main stage is a rectangle and the runways is a square. the length of the main stage is three times the length of the runway and the width of

*asked on November 26, 2016* -
## Algebra

Christy drove at an average speed of 55 mi/h from her home in San Francisco to visit her sister in Tucson. She stayed in Tucson 10 hours, and on the trip back averaged 35 mi/h. She returned home 50 hours after leaving. How many miles is San Francisco from

*asked on November 23, 2016* -
## math

according to arrow impossibility theorem ,it is possible for voting method to satisfy every fairness criteria that the texbook discussed?

*asked on November 22, 2016* -
## math algebra

if f(x) = x+1/x^2-9 and g(x) =x/x-3, find a) domain of f(x) b) domain of g (x) c) (f+g) (x) d) the domain of (f+g) (x)

*asked on November 19, 2016* -
## math

A group of people were asked if they had run a red light in the last year. 433 responded "yes", and 424 responded "no". Find the probability that if a person is chosen at random, they have run a red light in the last year.

*asked on November 15, 2016* -
## math

each letter represents a different number find the value of p,o and f that will make this puzzle true. pop+of=opp

*asked on November 10, 2016* -
## stats

The coding department of Community Physician’s Clinic is interested in purchasing a software program that will edit claims before they are sent to the Billing Office. The license fee for the software is $60,000 per year. The software is expected to

*asked on November 8, 2016* -
## stats

In September, the hospital had three coders who coded 1,500 inpatient records, and 22 of the records failed the quality screens. a. What is the average number of records coded by each coder? b. What was the average number of records coded each

*asked on November 8, 2016* -
## Physics

Commercial airplanes are sometimes towed out of the passenger loading area by a tractor. The 1800 kg tractor exerts a force of 1.75 104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. (a) If the

*asked on October 8, 2016* -
## chemistry

How can values of heats of formation found in tables be used to calculate heats of reactions? I am having a really hard time understanding this.

*asked on October 2, 2016* -
## chemistry

How much energy is required to make H2O(g) from H2O(l)? Basically this deals with bond energies and heats of formation. But I'm not sure how to find it

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

Let C=f(q)=450+0.2q give the cost in dollars to manufacture q kg of a chemical. a) Which of the following statement(s) correctly explain the meaning of f^(−1)(C) b)Find a formula for f^(−1)(C)=

*asked on September 26, 2016* -
## Chemistry

Five year old Andrew weighs 45 lbs and requires insulin. His doctor has prescribed 0.150 units of insulin/kg body weight/hr while he is in the hospital. The insulin bottle you have possesses a concentration of 20.0 units/15.0 ml and all must be given. Give

*asked on September 24, 2016* -
## chemistry

is this statement true? More heat is needed for vaporization of a liquid compared with melting a solid of the same substance.

*asked on September 23, 2016* -
## chemistry

If you transfer 5 J of energy to 1 g water and to 1 g ethanol, each starting at the same temperature which would have a higher temperature at the end? Water or ethanol? or will they have the same temperature at the end?

*asked on September 23, 2016* -
## Math

Rewrite the expression 2logx−3log(x^2+1)+4log(x−1) as a single logarithm logA. Then the function

*asked on September 20, 2016* -
## Math

Solve for x 8⋅4^2x−4=53

*asked on September 20, 2016* -
## Math

The cost (in dollars) of producing x air conditioners is C=g(x)=560+40x. Find a formula for the inverse function g−1(C).

*asked on September 20, 2016* -
## Chemistry help please!

Why does a clear, saturated solution of PbI2 form a yellow precipitate when a small amount of KI is added to the solution? A. KI is insoluble in PbI2. B. PbI2 is always insoluble in water. C. Adding KI is like adding I-, which drives the reaction toward

*asked on September 19, 2016* -
## Chemistry please help!

What happens to the following reaction at equilibrium if the pressure is decreased? 2H2(g) + O2(g) 2H2O(g) A. The equilibrium shifts left because Q > K. B. The equilibrium shifts right because Q < K. C. The equilibrium shifts left because Q < K. D. The

*asked on September 19, 2016* -
## Chemistry

pH indicators change color at their _____. The pH at which the color change happens for a particular indicator molecule depends on its: A. pKa; concentration. B. pKa; Ka or Kb. C. equivalence point; Ka or Kb. D. equivalence point; concentration. Is the

*asked on September 18, 2016* -
## Chemistry

Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D.

*asked on September 18, 2016* -
## Chemistry

At a high temperature, the equilibrium constant for the decomposition of hydrogen iodide is 65.0. If the initial concentration of HI is 1.60 M, what is the concentration of hydrogen at equilibrium? 2Hl(g) H2(g) + I2(g) A. 1.42 M B. 0.753 M C. 0.240 M D.

*asked on September 18, 2016* -
## Chemistry

The pH of your swimming pool is found to be 6.89. What is the concentration of H+ ions in the pool? A. 7.76 × 106 M B. 0.84 M C. 1.29 × 10-7 M D. 1.29 × 107 M

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

Which of the following pairs would make a good buffer? A. H2C2O4 and HC2O4- B. HNO3 and NO3- C. NaOH and NaCl D. HCl and NaOH Would it be C? I think I remember learning about these in a lesson about buffers, hence why my instinct is to go with C...

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

A solution has [OH-] = 3.5 × 10-6. Based on that, what must be true about this solution? A. It is an acidic solution. B. It is a strong base. C. It is a strong acid. D. It is a basic solution.

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

When are more products of a reaction available initially than at equilibrium? A. K = 0 B. Q < K C. Q = K D. Q > K

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

The subject,verb and object in " great people endure criticism without resentment"

*asked on September 12, 2016*