Friday

March 27, 2015

March 27, 2015

Total # Posts: 2,086

**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*

**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, adn 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*

**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*

**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*

**Math**

Let P be the principal invested. The amount at the end of four years will be for each scenario 1: P*(1+0.0225/2)^(4*2) 2: P*(1+0.0225/4)^(4*4) 3: P*(1.0195^4)
*January 29, 2013*

**statistics**

I. 71. The mode, by definition is the answer that appears most frequently. II. The midrange is 64, which is by definition the arithmetic mean of the largest and the smallest values in a sample or other group. The range is 55. Let H = highest score, and L = lowest score. Then...
*January 27, 2013*

**probability**

suppose that the times taken to complete an online test are normally distributed with a mean of 45 minutes and a standard deviation of 12 minutes. find the probability a. that for a randomly selected test, the time taken was more than 1 hour. b. that the mean number of minutes...
*January 21, 2013*

**science**

250 mL
*January 20, 2013*

**Physics**

The length of the telescope is 0.2 + 1.6
*January 20, 2013*

**concepts to population health**

They should use this data to identify where resources should be most efficiently concentrated/directed in order to best affect the health outcomes of the population as a whole.
*January 20, 2013*

**Physics**

y = y0 + vy0*t -1/2*g*t^2 x = x0 + vx0*t where y is the y position as a function of time, y0 is the initial y position, vy0 is the initial y velocity, g is the acceleration due to gravity (9.8 m/s^2), t is time, x is the x position as a function of time, vx0 is the initial x ...
*January 20, 2013*

**Math**

You can take any two currency exchange rates and divide them by each other to get 1: for example 1 CDN = $0.829 Dividing both sides by 1 CDN 1 CDN / 1 CDN = 1 = $0.829/1 CDN Since you can multiply anything by 1 and still get the same result (1*x = x); You can multiply by the ...
*January 20, 2013*

**Math**

What is the smallest of 3 consecutive positive integers if the product of the smaller two integers is 5 less than 5 times the largest integer? I can't remember how to start this.
*January 15, 2013*

**Math**

What is the smallest of 3 consecutive positive integers if the product of the smaller two integers is 5 less than 5 times the largest integer? I can't remember how to start this.
*January 15, 2013*

**Precalculus/Trig 5**

sin(26) = (120+15)/guywire where guy wire is the length of the guy wire
*January 14, 2013*

**statistics**

make a plot rounding to the nearest ten: (1, 630); (2, 670); (3, 740); (4,650); . . . then a plot rounding to the nearest 100: (1, 600); (2, 700); (3, 700); (4, 700) . . . c. What is the average El Nino rain (628 + 669 + 740 + . . . + 872) / 23 Is this less or greater than the...
*January 14, 2013*

**muniz**

Q = m*c*(130- -22) where m is the mass of the water, c is the specific heat of water, which you will have to look up; Make sure it matches with your units of mass and temperature
*January 14, 2013*

**economics**

If she had worked those two days, she would make +$200 Instead, she spends $180 + $198 = $378 The total opportunity cost is 378 + 200 = 578. This is how much money she'll lose by going on the trip instead of working
*January 13, 2013*

**physics**

centripetal acceleration is v^2/r The tension in the chain is m*v^2/r where v is the speed = 2*PI*r*f where f is the frequency; r is the radius; m is the mass v = 2*PI*1.2*0.432 solve for the acceleration and tension using the above equations
*January 13, 2013*

**Physics**

v = 2*PI*r/T where T is the period 2010 = 2*PI*0.15/T centripetal acceleration = v^2/r Force = m*v^2/r
*January 13, 2013*

**math**

The greatest coin is a quarter; If you choose three quarters, you only have $0.75, so $5.00 is greater.
*January 13, 2013*

**Physics**

Take components of the force: F1x = 364*cos(33) F1y = 364*sin(33) F2x = 522*cos(11) F2y = 522*sin(11) Fnetx = F1x + F2x Fnety = F1y + F2y Fnet = ((Fnetx)^2 + (Fnety)^2)^0.5 at an angle theta given by tan(theta) = Fnety/Fnetx where Fnet = m*a = 3050*a Solve for a, the acceleration
*January 13, 2013*

**Chemistry**

lamda * f = c where c is the speed of light = 3*10^8 m/s; f is the frequency; lambda is the wavelength.
*January 13, 2013*

**Machanics**

vf - vi = 5*10^6 - 2*10^6 = 3*10^6 where vf is the final speed and vi is the initial speed. Assuming a constant deceleration, the electron passes through 2.1 multiply 4cm = 8.4 cm of paper. 8.4 = 1/2*a*t^2 deltav = 3*10^6 = a*t where a is the acceleration, t is the time. You ...
*January 13, 2013*

**Physics**

525 - 413
*January 13, 2013*

**Physics**

You are not going to die. You just might not get the right answer.
*January 13, 2013*

**physics**

Use conservation of momentum. In the x direction: 0.02*5.5 = 0.02*vA*cos(65) + 0.04*vB*cos(37) In the y direction: 0 = 0.02*vA*sin(65) - 0.02*vB*sin(37) You should be able to use algebra to solve for these equations, since you have two equations with 2 unknowns; vA is the ...
*January 13, 2013*

**physics**

F(q2) = ke*q1*q2/(r12)^2 + ke*q3*q2/(r23)^2 = 0 or q1*q2/(r12)^2 = q3*q2/(r23)^2 q*-2q/(r12)^2 = 3q*-2q/(r23)^2 -2*q^2/(r12)^2 = -6q^2/(r23)^2 or 1/(r12)^2 = 3/(r23)^2 where r12 is the distance between charge 1 and 2; r23 is the distance bewteen charge 2 and 3. For symmetry ...
*January 13, 2013*

**Physics**

deltaL = a*L*deltaT where deltaL is the change in length, a s the linear expansion coefficient, L0 is it's initial length, deltaT is the final temperature deltaL = 10^-5*178*(-35 - 39)
*January 9, 2013*

**math**

N = (1 + E)^12 -1 where N is the nominal interest rate per year; and E is the effective monthly interest rate per year. For Ally Bank, (N+1)^10 = 1.25 Use this equation to solve for N: N+1 = log10(1.25) N = log10(1.25) - 1 Then use the first equation to find E
*January 8, 2013*

**math (calculate speed)**

m*g*h = 1/2*m*v^2 where m is the mass; g is the acceleration due to gravity; v is the speed. At the top of his dive, the swimmers energy is entirely potential energy = m*g*h; When he enters the pool, the potential energy is converted to kinetic energy: 1/2*m*v^2 v = = (2*g*h)^0.5
*January 8, 2013*

**Math**

-3*y + 2*x = -12 multiply both sides by a negative 1: 3*y - 2*x = 12 3*y = 12 + 2*x y = 2/3x + 4 This is an equation of a line with slope 2/3; y intercept = 4; Graph this equation; the graph of this line is the solution to this equation
*January 8, 2013*

**Physics, waves**

v = (T/mu)^0.5 where v is the speed, T is the tension, and mu is the linear density v = lamda*f ; lambda = 2*L for the fundamental mode, where f is the frequency, and lambda is the wavelength f = (1/(2*L))*(T/mu)^0.5 1.61 g = 0.00161 kg mu = 0.00161/0.64 200 = (1/(2*0.64))*(T/...
*January 8, 2013*

**science, physics**

The total energy is entirely kinetic energy as the block passes through the equilibrium position E = 1/2*m*v^2 where m is the mass, and v is the velocity
*January 8, 2013*

**Physics**

9.4 cm = 0.094 m x = -0.094*cos(w*t) v = dx/dt = 0.094*sin(w*t) where w = (k/m)^0.5 x is the x position; v is the speed; w is the angular velocity; k is the spring constant; m is the mass at t = 0.24 s, v = 0.094*sin(((2080/0.46)^0.5)*0.24)
*January 8, 2013*

**math**

Her expectation of winning is 1%. The fair value is $200/100 = $2.00
*January 8, 2013*

**maths**

Let the rate at which A works be a; the rate at which B works be b; the rate at which C work be c: (a + b)*12 = 1 (b + c)*15 = 1 a = 2*c gives b + a/2 = 1/15 b = 1/15 - a/2 Substituting into the first equation: (a + 1/15 - a/2)*12 = 1 a/2 + 1/15 = 1/12 a/2 = 1/12 - 1/15 = (15-...
*January 8, 2013*

**algebra**

Plot the points (140, 1.4); (150, 1.25); (170, 0.93); (175, 0.78); (205, 0.43) on your graphing calculator; Use your calculator manual to find out how to fit this data to a straight line (linear model), and then a quadratic equation (quadratic model) Look at the results; which...
*January 8, 2013*

**Physics**

The velocity of the passenger is (50-3) = 47 m/s East
*January 7, 2013*

**Social Studies**

Summarize the major factors that allowed the Incas to conquer and rule their large empire. Some suggest that, in many ways, the Incas were like the Romans or other Pre-Columbian American Civilizations. Evaluate whether they were more similar or different, and why. Make sure to...
*January 6, 2013*

**calculus**

solve the following logarithmic equation. Be sure to reject any value of x that is not in the domain of orginal expression. then in the solution set round to two decimals places. Inx=8 I get e^8 But am having a hard time with rounding two decimal places. Can someone help?
*January 1, 2013*

**calculus**

Thanks for telling me how to actually write it here.
*December 31, 2012*

**calculus**

solve the following exponential equation. exact answers only 1-8x 3x ¨i =e *I know that I did not post this correctly but I do not know how to put the 1-8x above the pie symbol and 3x above the e.
*December 31, 2012*

**calculus-can someone please help me with this ques**

I have two questions if someone can PLEASE help. 1.solve the equation in the real number system. x^4+11x^3+24x^2-23x+35=0 **Please show work** 2.Use the remainder theorem to find the remainder. When f(x)is divided by x-3. Then use the factor theorem to determine whether x-3 is...
*December 30, 2012*

**math**

Using the best-fit line below for prediction, answer the following questions: a) What would you predict the price of Product X in volume of 150 to be (approximately)? b) What would you predict the price of Product X in volume of 100 to be (approximately)?
*December 29, 2012*

**Physics **

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
*December 20, 2012*

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