Ralph's Electronics purchased 75 sound bars from the manufacturer for $250 each less discounts of 25% and 12%. The regular markup on the sound bar is 60% of the regular selling price, and Ralph's Electronics overhead is 10% of the regular selling price. On the Black Friday sale, the sales price was reduced to $199.
The regular selling price =?
Profit or loss (please indicate which one) on each sound bar at the sale price = ?
In: Advanced Math
A hotel rental service needs to have clean towels for each day of a three-day period. Some of the clean towels may be purchased new and some may be dirty towels from previous days that have been washed by a laundry service. The cost of new towels is $1 per towel, the cost of a fast one-day laundry serice is 40¢ per towel, and the cost of a slow two-day laundry service is 25¢ per towel. If the rental service needs 300,200, and 400 clean towels for each of the next three days (respectively), how many towels should the rental service buy new and how many should the rental service have washed by the different laundry services so as to minimize total costs?
The solution is minC=570 at (x,y,z,w)=(400,100,200,200), please use hand-writing for the process.
In: Advanced Math
An eccentric Computing Science Professor decides to hide their
hoard of NSERC funded money, 100 identical gold coins, in 20 unique
locations hidden across campus. It is assumed that multiple coins
or even none can be stored at each location.
a) How many ways can they distribute these coins without any
restrictions?
b) How many ways can they distribute these coins if each location
gets at least 5 coins?
c) How many ways can they distribute these coins if each location
only gets an even number of coins?
d) How many ways can they distribute these coins if the
Sessional Instructor Lab location can't have more than 20 coins
distributed to it?
BONUS: e) How many ways can he distribute these coins if neither
the Data-Mining Lab location nor the Sessional Instructor office
location can have more than 20 coins (e.g., 25 coins to the
Data-Mining Lab and 25 coins to the Sessional Instructor Office
with 50 coins to other locations would not be legal)? It is assumed
they cannot trust any of his colleagues with their precious and
hard-earned research funds.
ONLY ANSWER d) and BONUS.
Please make sure everything is clear and understandable, if it's good I will give thumbs up 100%! Thanks.
In: Advanced Math
1a) Theasymptotes for the graphs of tangent, cotangent, secant, and cosecant are difficult to remember, especially if there is a change in the period. Discuss how to find the asymptotes from the equation of the function. Give an example to illustrate.
1b) Discuss the restricted quadrants for the inverse trigonometric functions.
2) Write down all the identities.
2a) sum and difference Identities
2b) Double-Angle Identities
2c.) Half-Angle Identities
2d) Power-Reduction Formulas
In: Advanced Math
Find the best quadratic approximation to f(x,y) = e^{5}^{y}cos(-4x) about the origin (0,0) and estimate the value when this approximation is used to calculate f(0.1,0.1).Do not do the error approximation. Also, find the extreme values of the function f(x,y,z) = 8y^{2}-4xz +16z - 35 on the surface 2x^{2}+4y^{2}+4z^{2} = 32
Thank you for your help
In: Advanced Math
3. Parametric Curves (7 marks total) (a) Explain in your own words the similarities and differences between the following two parametric curves. i. x = t 2 , y = t 4 ii. x = cost, y = cos2t (b) . Consider the curve defined parametrically by x = at2 + bt and y = ct3 + dt2 + et, where a, b, c, d, e are all constants. Give one example of what each of the constants a, b, c, d, e could equal so that your curve has exactly one vertical tangent line and no horizontal tangent lines. Show all of your work! Hint: start by finding a formula for dy dx !
In: Advanced Math
1.Identify the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation.) f(x) = sin(x) + 5 0 < x < 2π increasing decreasing
2. Identify the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation.) f(x) = x + 2 cos(x), 0 < x < 2π increasing decreasing
3. Consider the following function. f(x) = x + 1 x2 (a) Find the critical numbers of f. (Enter your answers as a comma-separated list.) x = (b) Find the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) increasing decreasing (c) Apply the First Derivative Test to identify the relative extremum. (If an answer does not exist, enter DNE.) relative maximum (x, y) = relative minimum (x, y) =
4. s(t) = t3 − 5t2 + 3t − 290 (a) Find the velocity function v(t) of the particle at any time t ≥ 0. v(t) = (b) Identify the time interval(s) on which the particle is moving in a positive direction. (Enter your answer using interval notation.) (c) Identify the time interval(s) on which the particle is moving in a negative direction. (Enter your answer using interval notation.) (d) Identify the time(s) at which the particle changes direction. (Enter your answers as a comma-separated list.) t =
5. An air traffic controller spots two airplanes at the same altitude converging to a point as they fly at right angles to each other. One airplane is 75 miles from the point and has a speed of 450 miles per hour. The other is 100 miles from the point and has a speed of 600 miles per hour. (a) At what rate is the distance between the planes changing?-------- mph (b) How much time does the controller have to get one of the airplanes on a different flight path? -------h
6. An airplane flies at an altitude of y = 5 miles toward a point directly over an observer (see figure). The speed of the plane is 600 miles per hour. Find the rates (in radians per hour) at which the angle of elevation θ is changing when the angle is θ = 30°, θ = 60°,and θ = 80°. (a) θ = 30° rad/hr (b) θ = 60° rad/hr (c) θ = 80° (Round your answer to two decimal places.) rad/hr
7. The formula for the volume of a cone is given below. Find the rate of change of the volume for each of the radii given below if dr/dt is 8 inches per minute and h = 18r. V = (1/3)πr2h (a) r = 9 in V' = π in3/min (b) r = 30 in V' = π in3/min
In: Advanced Math
What are the connected components and the path components of the product space R x R_{l} where R has the standard topology and R_{l} has the lower limit topology?
In: Advanced Math
A Ferris wheel with a diameter of 20 m and makes one complete revolution every 90 seconds. Determine an equation that models your height, in metres, above the ground as you travel on the Ferris Wheel over time, t in seconds. Assume that at time t=0 the Ferris Wheel is at the lowest position of 3 m.
In: Advanced Math
1) Suppose that a function f(x) is defined for all real values of x, except x = x_{o}. Can anything be said about lim x → x 0 f ( x ) ?
Give reasons for your answer.
2) If x^{4} ≤ f(x) ≤
x^{2} for x in [-1,1] and
x^{2} ≤ f(x) ≤
x^{4} for x < -1 and x >
1, at what points c do you automatically know lim x → c f
( x ) ? What can you say about the value of the limits at these
points (x = +/-1) and at x = 0?
3)
Explain why the following statement is true or
false:
If g is continuous and increasing on its entire domain,
then g(x_{2}) >
g(x_{1}) when x_{1} <
x_{2}
In: Advanced Math
Identify the letter name, the quality, and quantity of each of the following propositions. Also, state whether their subject and predicate terms are distributed or undistributed.
Some residents of Manhattan are not people who can afford to live there.
In: Advanced Math
Produce an equivalent proposition without implications (">") and without not's ("-") using DeMorgan's Laws and the implication rule.
-Ǝ x Ǝy ∀z [ [ ( -X>Z ) > (Z > -Y)] + -(Y + Z )]
In: Advanced Math
1. Use a Laplace transform to solve the initial value problem: 9y" + y = f(t), y(0) = 1, y'(0) = 2
2. Use a Laplace transform to solve the initial value problem: y" + 4y = sin 4t, y(0) = 1, y'(0) = 2
In: Advanced Math
Let x,y ∈ R3 such that x = (x_{1},x_{2},x_{3}) and y = (y_{1},y_{2,}y_{3}) determine if <x,y>= x1y1+2x_{2}y_{2}+3x_{3}y_{3}
is an inner product
In: Advanced Math
In: Advanced Math