03/05/15

discrete math. sets problem. true or false?
let T = {(x,y) ∈ R x R(real numbers) | y = √x / (√(x-3)) Let D = {y ∈ R, | (x,y) ∈ T for x ∈ R}. for each one, decide if true or false a) 1/4 ∈ D b) 4 ∈ D why?
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03/05/15

Find the values of x where f has a local max and min
f(x)= ln(2x+4)+x^2
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03/04/15

algebra advanced word problem
Tito Sanchez receives a weekly salary of $400 at Anderson Appliances. He also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he... more
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03/04/15

Maximum volume
From a thin rectangular piece of cardboard 8 inches on a side, small squares are cut out of the corners. The sides are then folded up to form a box. What size squares should be cut out to maximize... more
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03/03/15

trigonometric functions
The minute hand of a clock is 6 inches long and moves from 3 o'clock to 5 o'clock. How far does the tip of the minute hand move? Express your answer round to two decimal places.
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03/02/15

what is the equation of a line through point (-4,5) that is perpendicular to the line with equality y=-6x+4?
Please help
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03/02/15

homework help in trigonometric functions
A point moves on a circular path with the radius of 4 units. If the point covers an arc of 8 units, find the angle in radians made by the arc at the center of the circular path.
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03/02/15

Golden Rectangle- Fibonacci
A golden rectangle has a longer side of length 180 ft. Which of the following numbers most closely represents the length of the shorter side of the rectangle?   a. 291.24 ft b. 111.25 ft c.... more
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03/02/15

Word problem on equation and inequalities
the top four medal winners in all sports during the 2012 summer olympics were michael phelps, Missy Franklin, Allison Schmit, and Ryan Lochte. The total number of medals won by these athletes was... more
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03/02/15

20 foot ladder leans against a tree and makes an angle of 40 degrees with the ground.
A 20-ft ladder leans against a tree and makes an angle of 40 degrees with the ground. What is the distance from the top of the ladder to the base of the tree?
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03/02/15

one number is 3 times another. the sum of their reciprocals is 20/3.
I need to understand how to set up these kind of questions.
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03/02/15

find how many men are needed
The number of hours h that it takes m men to assemble x machines varies directly as the number of machines and inversely as the number of men. If four men can assemble 12 machines in four hours,... more
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03/02/15

Write the revenue equation based on the number of additional persons.
A group excursion is offered at a price of $600 per person. This price will be honored if 200 tickets are sold. For each additional person, the price will decrease by $2. Write the revenue equation... more
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03/01/15

the weight of a certain material varies directly with the surface area of that material.
If 4 sq ft weight 1/5 pounds how much will 10 sq ft weight
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02/28/15

Need help with the sum/difference formula?
Im having trouble using the sum/difference formula to simplify the equations below. Help is greatly appreciated     1) cos (π + θ) 2) tan (π/6 + π) 3) sin (π/4 - π/2)   π = "pi"
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02/27/15

HELP ME WITH THIS
In the coordinate plane, the points X−10, 8 , Y−2, 3 , and Z11, 6 are reflected over they-axis to the points X ' , Y ' , and Z ' , respectively. What are the coordinates of X ' , Y ' , and Z '?
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02/27/15

SAT PREP 2015
If j-k=9, k=6m, and 3m=7, what is the value of -5j?
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02/26/15

Prove the Trigonometric Identity
(sinx/cscx-1) + (sinx/cscx+1) = 2tan2x
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02/26/15

Prove the Trigonometric Identity
-tan2x + sec2x = sec2xcos2x
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02/26/15

Integrating using trig. sub. Steps!
let x=4sqrt(5)sint, integrate sqrt((16-5x^2)).
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02/26/15

Change of Rate
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.4 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 16 cm. (Note the... more
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02/25/15

change of base formula problem
(a) State the “Change of Base Formula” for logarithms.(b) If you know that d/dx (ln x) = 1/x, explain (IN WORDS) how you can use the Change of Base Formula to calculate d/dx (logbx).(c) Using your... more
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02/25/15

What is the domain of this rational function R(x)=3-6x/x^3-5x^2+4x
Find the domain
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02/24/15

You buy a new mountain bike for $300. The value of the bike decreases by 25% each year.
a) Wrtie a model giving the mountain bike's value V (in dollars) after t years. b) Use the model to determine the value of the bike after 3 years/ c) How long will it take for the value of the... more
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02/24/15

If f(x)=4x-1 and g(x)=x+1/4, what are f(g(x)) and g(f(x)).
Are f(x) and g(x) inverse functions?
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