Wednesday
May 4, 2016

# Posts by Jennifer

Total # Posts: 2,296

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

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

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

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