# Posts by Jennifer

Total # Posts: 2,444

**Math**

I think its as a function of time

*February 14, 2014*

**Math**

A bicyclist is competing in a tournament. He is currently in a very hilly part of the tournament's course. For his current hill, his height in metres over time in minutes is modelled by the function; f(x)=-0.00075x^2-0.5825x+17.269 a) Estimate the bicyclists instantaneous ...

*February 14, 2014*

**Math**

State two points on the graph of y=sinx that will give an average rate of change of 0?

*February 14, 2014*

**Math**

Got it! thanks for the correction.

*February 14, 2014*

**Math**

Awesome Thanks!!

*February 14, 2014*

**Math**

Determine the value of 'a' so that the average rate of change of the function h(x)=x^2+3x+2 on the interval -3<=x<=a is -1

*February 14, 2014*

**Math**

A batter hits a baseball straight up into the air. The height of the ball in metres above the ground is given by h(t)=-4.9t^2+23t+2, where t is the number of seconds after the ball is hit. a) What is the average rate of change in the height of the ball over the interval 1.5<...

*February 14, 2014*

**physics 2 for college**

What’s the potential energy of a ball attached to a spring that is stretched 0.2m from its original unstretched position. (Spring constant k=200 N/m)

*February 9, 2014*

**chemistry**

The molar mass of HCl is 36.5g use the fact that 1 amu = 1.6605x 10-24g power g to calculate Avogradro’s number.

*January 31, 2014*

**geometry**

solve for -4x=3y=3 7x-9y-6

*January 26, 2014*

**Physic II**

A proton is located at x = 1.0 nm, y=0.0nm. and an electron is located at x=0.0nm y=3.0nm. Find the attractive Coulombic force between them. (The value of k is 9.0 * 10^9 N*m^2/C^2) I found 2.3 x 10^-11 N am I correct?

*January 26, 2014*

**Fractions**

lisa's dog has 4 squeaky toys. two thirds of the dog's toys are squeaky toys. how many dog toys does lisa's dog have in all?

*January 24, 2014*

**MATH Fractions**

so if i have 4 sandwiches i have to add 1 whole of each sandwich? sorry 3rd grade is crazy and they don't explain it that well

*January 24, 2014*

**Business**

Will there ever be a single set of international rules governing multinational companies? Why? Why not? In what way are United States businesses demanding socially responsible behavior from their international suppliers? Why is this important to discuss? (graded)

*January 21, 2014*

**Business**

Will there ever be a single set of international rules governing multinational companies? Why? Why not? In what way are United States businesses demanding socially responsible behavior from their international suppliers? Why is this important to discuss? (graded)

*January 21, 2014*

**Business**

What do you presume had happened to get the U.S. corporations and workers to take their eyes off of their own economic interest? It seems the "carrot" of cheaper prices were dangled in front of them, but they didn't perceive the "sucker punch" of ...

*January 14, 2014*

**math**

you would use 1/3 cups of sugar and 1 1/4 cups of flour to half the recipe.

*January 13, 2014*

**math**

Fractions and mixed numbers are often used in everyday life. Discuss a real-life example in which you would need to add, subtract, multiply, or divide fractions or mixed numbers, and show the math

*January 13, 2014*

**Science**

Lines of latitude and longitude on a globe or map____________. a. estimate b. move c. intersect d. adjust

*January 12, 2014*

**help plz? 2 questions**

Thanks y'all! <3

*December 17, 2013*

**math**

alaine has a ribbon that is 14 and one half feet long how long will each strip be if she cuts it into four equal parts

*December 16, 2013*

**math**

in a store all the oranges are stacked in triangular pyramids, each layer of oranges is in the shape of an equilateral triangle and the top layer is an single orange. How many oranges are are in a stack ten layers high

*December 8, 2013*

**Physics Classical Mechanics**

thnks, yeah i got it wrong too. i think that by top view means that its a disk and you are looking at it from the top. so you just have to do the torque torque= F*d=I*alpha so alpha = F*d/I d= distance between the point of aplication of the force and the point of rotation

*December 7, 2013*

**Physics Classical Mechanics**

mets, can you help me with the aceleration please???

*December 7, 2013*

**physics Classical Mechanics**

yes i got it wrong too

*December 7, 2013*

**physic**

a) t=d/v = 0.5588 seconds N=f*t = 650*0.5588= 363.235 b) i don't know it c) f'= f* (1-(speed observer/speed sound))

*December 6, 2013*

**science (ipc)**

Describe the motion of an unachored rowboat when a water wave passes. Describe the wave move the boat forward?

*December 3, 2013*

**science**

lol copy and paste.... sad

*December 1, 2013*

**Spanish 2 Questions**

1- te 2- te 3-, me 4- me 5- nos

*November 30, 2013*

**math**

You are the buyer for The Shoe Outlet. You are looking for a line of men’s shoes to retail for $79.95. If your objective is a 55% markup based on selling price, what is the most that you can pay for the shoes and still get the desired markup?

*November 26, 2013*

**Physics**

An X-ray binary consists of 2 stars with masses m1 (the accreting compact object) and m2 (the donor). The orbits are circular with radii r1 and r2 centered on the center of mass. (a) Find the orbital period T of the binary following the guidelines given in lectures. Express ...

*November 24, 2013*

**math**

Ned's Sheds purchases building materials from Timber town Lumber for $3,700 with terms of 4/15, n/30. The invoice is dated October 17. Ned's decides to send in a $2,000 partial payment. By what date must the partial payment be sent to take advantage of the cash ...

*November 19, 2013*

**math**

The Empire Carpet Company orders merchandise for $17,700, including $550 in shipping charges, From Mohawk Carpet Mills on May 4. Carpets valued at 1,390 will be returned because they are damaged. The terms of sale are 2/10, n30 ROG. The shipment arrives on May 26 and Empire ...

*November 19, 2013*

**Math**

A spider and a ﬂy are in a room that has length 8 m, width 4 m, and height 4 m. The spider is on one end wall 1 cm from the ﬂoor midway from the two side walls. The ﬂy is caught in the spider’s web on the other end wall 1 cm from the ceiling and also ...

*November 17, 2013*

**Math**

4. A spider and a ﬂy are in a room that has length 8 m, width 4 m, and height 4 m. The spider is on one end wall 1 cm from the ﬂoor midway from the two side walls. The ﬂy is caught in the spider’s web on the other end wall 1 cm from the ceiling and ...

*November 17, 2013*

**Physics question - Damon please help!!**

Thank you so much for taking the time to help me

*November 11, 2013*

**Physics question - Damon please help!!**

I am doing the monkey and hunter question, and I need to find out what the minimum speed the bullet has to be.. The variables I have are g, Vo, theta, Dx(horizontal distance from monkey), and Dy (vertical distance from monkey). I need to derive Vo in the form of (Dx/cos0)(sqrt...

*November 11, 2013*

**Algebra**

A plane has a speed of p km/h in still air. It makes around trip flying with and against the wind of w km/h.Show that its average speed is p^2-w^2/p km/h

*November 5, 2013*

**Algebra**

A plane has a speed of p km/h in still air. It makes around trip flying with and against the wind of w km/h.Show that its average speed is p^2-w^2/p km/h

*November 5, 2013*

**Math**

Jasmine has taken an online boating safety course and is now completing her end of course exam. As she answers each question.,the progrss bar at the bottom She has just completed question 16 and the test bar how she is 20% of questions. How many total questions of the teat?use...

*October 29, 2013*

**Finance**

If upon retirement in 20 years Simon plans to invest $400,000 in a fund that earns 5%, what is the maximum annual withdrawal he can make over the following 15 years

*October 25, 2013*

**(Dead Poets Society)**

Did Neil Perry make any accomplishments in the movie? Also what did Todd Anderson sacrifice to reach his goal of pleasing his teachers? Please help!

*October 24, 2013*

**Math- Algebra**

A motorist was to travel from town A to town B, a distance of 80 miles. He traveled the first 24 minutes at a certain rate; traffic then increased and for the next 6 minutes he averaged 10 miles per hour less than his original speed; then traffic eased up and he traveled the ...

*October 20, 2013*

**Physics**

You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. The soccer ball is kicked at 41° from the edge of the building with an initial velocity of 21 m/s and lands 59 meters away from the wall. How tall is the ...

*October 10, 2013*

**Science- Radioactive Dating**

Thanks y'all! I got 100% <3

*October 10, 2013*

**statistics**

The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 7 and a standard deviation of 1.90 hours. Based on this distributional information we can conclude that at least 95 % of this population sleep ...

*September 27, 2013*

**Math**

There are two main classes of individuals who can affect the outcome of an experiment: Those who could influence the results Those who evaluate the results When all the individuals in either one of these classes are blinded, an experiment is said to be: A) Single blind (I'...

*August 29, 2013*

**Complements**

I think I have the complements right (see what's in brackets), but I need to say whether they're predicate adjective, predicate nominative, direct or indirect objects. At first this Saturday had been a warm, sunny [day]. However, the sky became [greyer] and [greyer] as...

*August 24, 2013*

**Mumford HS**

graph on calculator and estimate local maxima and local minima g(x)=1/2x^3-4x+3

*July 13, 2013*

**Math**

A soccer ball is kicked from the ground. After travelling a horizontal distance of 25m, it just passes over a 2m tall fence before hitting the ground at a horizontal distance of 35m. a) Determine an equation to represent the height of the ball relative to its horizontal ...

*July 10, 2013*

**College Algebra**

Suppose that the Quadratic equation had two X-intercepts. How could you use the intercepts to find the vertex?

*June 5, 2013*

**College Algebra**

When using the Quadratic formula, why is only necessary to examine the discrimant to determine if the equation only has real numbers?

*June 5, 2013*

**tech III math ( ACT Prep)**

A neon sign flashes every 4 seconds, another neon sign flashes every 6 seconds. If they flash together,how manyseconds later will they flash together again?

*June 3, 2013*

**Physics**

How much work does it take to stretch the spring from 10 cm to 20 cm from equilibrium?

*May 30, 2013*

**Chemistry**

calculate the volume of the 3.0 M stock solution needed to make a diluted 30mM solution in 400ml

*May 29, 2013*

**Chemistry**

calculate the volume of the 3.0 M stock solution needed to make a diluted 30mM solution in 400ml

*May 29, 2013*

**pre calc**

Find the exact value of sin(x-y) if sinx=-3/5 in Quadrant III and cosy=5/13 in Quadrant I.

*May 21, 2013*

**Calculus**

Using the four-step process find f(x)= 13 I know it is 0 and how to do the 4-step process, I just don't know how to do it without an exponent. Help please!

*May 15, 2013*

**Calculus**

An OPEN box has a square base and a volume of 108 cubic inches and is constructed from a tin sheet. Find the dimensions of the box, assuming a minimum amount of material is used in it's construction. HINT: the goal is to minimize the surface are of the OPEN box; this is ...

*May 14, 2013*

**economics**

65000

*May 2, 2013*

**roslyn**

Margo's soccer coach brought a large bag of watermelons to practice. The mass of the bag with all the watermelons in it was 12 kilograms. Explain how you could use estimation to figure out how many watermelons are in the bag.

*April 24, 2013*

**algebra**

Abby Tanenbaum paddled her canoe 10 miles upstream, and then paddled back to her starting point. If the rate of the current was 3 mph,and the entire trip took 3.5 hours, what was Abby's rate (in still water)?

*April 23, 2013*

**math**

Say the price of a gallon of milk was raised from $3.00 to $3.50. What was the percent increase? Round to the nearest whole percent.

*April 8, 2013*

**chemistry**

what is the mass of sodium nitrate (85.00g/mol) that releases 2.55L of gas at STP?

*April 5, 2013*

**Math**

I think the answer is 3/4

*April 2, 2013*

**Chemistry**

Okay, I calculated that it should be Fe^2+ that precipitates out first and the concentration of CO3^2- is 9.55x10^-10. is that correct? in regards to question b: where is K2CO3 coming from? how am I using that in the calculation?

*April 1, 2013*

**Chemistry**

I am so overwhelmed. can somebody please help me? Consider a solution that is 0.022 M in Fe^2+ and 0.014 in Mg^2+ A) if K2CO3 is to selectively precipitate one of the cations while leaving the other cation in solution, which cation will precipitate first? B) What minimum ...

*April 1, 2013*

**math**

howard has 3 m of ribbon. how many centimeters is that

*March 30, 2013*

**math**

two third of a blueberry pie is left in the refrigerator. If the leftover pie is cut in 6 equal size, which fraction of the original pie is each slice

*March 20, 2013*

**Life orientation**

Ways in which the human or enviromental problem impacts have on the community

*March 18, 2013*

**math**

i actually need the anwser my self

*March 15, 2013*

**Algebra**

you trim a large square picture so that you could fit it into a frame. you trim 3 inches from the length and 2 inches from the width. the area of the resulting picture is 56sq in what was the perimeter of the original large square picture?

*March 12, 2013*

**Math for Ms. Sue please! Last math questions!**

I took the test '-' u guys are jerks, I'm gonna help the rest of u out cuz here's the official correct answers: B A C D A A A

*March 3, 2013*

**Chemistry**

What is the mass of gas dissolved in a solution at 150kPa if 0.35g of the gas dissolves in 2.0L of water at 30kPa?

*March 3, 2013*

**math**

rectangular prism with a volume of 72 cubic inches; sum of the 3 lengths is 13; width is half of the height; the length is one more than the width what are the dimensions of the rectangular prism

*February 27, 2013*

**math fractions**

i don't know

*February 26, 2013*

**Finance**

After visiting several automobile dealerships, Richard selects the car he wants. He likes its $18,500 price, but financing through the dealer is no bargain. He has $3,700 cash for a down payment, so he needs an $14,800 loan. In shopping at several banks for an installment loan...

*February 15, 2013*

**Finance**

Joshua borrowed $2,300 for one year and paid $138 in interest. The bank charged him an $15 service charge. If Joshua paid the $2,300 in 12 equal monthly payments, what is the APR? (Round your answer to 1 decimal place

*February 15, 2013*

**Chemistry (Stoichiometry)**

Heres a balanced equation: Na2CO3(aq)+2AgNO3 (aq) --> 2NaNO3(aq)+Ag2CO3 (s) From this equation, 10 mL of AgNO3 in this contains 34 grams of AgNO3. Calculate the grams of solid product, Ag2CO3. Part 2: 10 mL of Na2CO3 in this experiment contains 21 grams of Na2CO3. ...

*February 6, 2013*

**Logarithms**

help- e^1-5x=3 find solution to 4 decimal places. I don't know how to type it in to my calculator!

*February 5, 2013*

**vocabulary**

It won’t take long to clean, but you can’t do it. Your clothes are on the floor, and games are everywhere.

*February 5, 2013*

**physics**

use x = x0 + v0*t + 1/2*a*t^2 v = v0 + a*t where x is position, x0 is initial position, v0 is initial speed, a is acceleration/deceleration, t is time, and v is speed as a function of time a) 56 - 6.2*t^2 = 0 Solve for t, the time it takes for the speed to go to zero. The ...

*February 4, 2013*

**algebra**

aletha earns $6.40 per hour

*January 31, 2013*

**physics**

After one second, when the patrol car is at location x = 0, the student is at 45 m. The student's location as a function of time, where t=0 when the police car starts accelerating is 45 + 45*t The policeman's position is 1/2*3*t^2 Set these two equations equal to each ...

*January 30, 2013*

**Physics**

Force = mass*acceleration Since the book is at rest in your hands and not moving, the net force is 0.

*January 30, 2013*

**physics**

First, find the x and y components of all vectors: Ax = -6.2*cos(52) Ay = 6.2*sin(52) Bx = 6.6*cos(27) By = 6.6*sin(27) Cx = 2.8*cos(57) Cy = -2.8*sin(57) Dx = Ax - Bx + 3*Cx Dy = Ay - By + 3*Cy D has a magnitude of D = (Dx^2 + Dy^2)^0.5 and a direction of theta given by tan(...

*January 30, 2013*

**Physics**

v(air) = lambda*fair where lambda is the wavelength, fair is the frequency in air v(helium) = lambda*fhelium v(air)/v(helium) = f(air)/f(helium) Look up the speed of sound in air and solve for f(helium)

*January 30, 2013*

**Physics**

the fourth standing wave frequency is 4*f1, where f1 is the fundamental wave frequency. The seventy fundamental frequency is 7*f1 7*f1 - 4*f1 = 3*f1 = 144 hz f1 = 144/3

*January 30, 2013*

**Physics**

(2.5 cm)sin[(3.0 m-1)x - (27 s-1 )t] + (2.5 cm)sin[(3.0 m-1)x + (27 s-1)t] = (5cm)sin[(3.0m-1)x - (27 s-1)t]

*January 30, 2013*

**Math**

A) 12 choose 3, calculated as 12! / (3! * 9!) = 12*11*10 / (3*2)

*January 30, 2013*

**Physics**

Energy = Power*time Power = I^2*r = I*V = 1.5*1.2 5 * 10^3 = 1.5*1.2*time solve for time. Your answer will be in the SI units of seconds; divide this answer by 60 sec/min to convert the answer to minutes

*January 29, 2013*

**computer science**

You're going to have to look up the functions in the particular language you're working with to learn how to store arrays, select elements of the array, and print statements.

*January 29, 2013*

**Chemistry**

Calcium propanoate or calcium propionate has the formula Ca(C2H5COO)2 . . . try using your textbook to look up the chemical formulas for the other reactants involved in these equations. . . such as hydrogen chloride and anhydrous ethanoic acid. Then research how these ...

*January 29, 2013*

**maths**

I imagine you're supposed to solve for the missing variables. I'll do a couple so you get the idea. 1) 2a - a/5 = 2/3 adding like terms: 1.8 a = 2/3 9/5 a = 2/3 a = 10/27 2) 3(a+4)+1 = a/2 3*a + 12 + 1 = a/2 3*a + 13 = a/2 13 = -2.5a a = 13/-2.5 . . .

*January 29, 2013*

**Algebra 1- Math**

2x - y = -4 -3x + y = -9 From the first equation: y = 2x + 4 Substitute this into the second equation: -3x + 2x + 4 = -9 -x + 4 = -9 -x = -13 x = 13 Then plug this answer back into the first equation 2*13 - y = -4 26 - y = -4 -y = -30 y = 30

*January 29, 2013*

**Chemistry**

You need to calculate the equilibrium constant K, which for C would be ([H2BO3-]*[CO3 2-]) / ([HCO3-]*[HBO3 2-]) Look up the equilibrium concentrations [] of the various compounds, and solve. If K > 1, products are favored. If K is less than 1, than reactants are favored

*January 29, 2013*

**help**

First, plot the parallelogram on graphing paper. Next, calculate the length of each side using the formula for the distance between 2 points (x1, y1), (x2, y2): ((x1-x2)^2 + (y1-y2)^2)^0.5 Then calculate the slope of each line passing through these two points: slope = (y2-y1...

*January 29, 2013*

**geometry**

why don't you try getting out your compass, following each of the student's steps, and see which one yields a parallelogram PQRS?

*January 29, 2013*