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Homework help...

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First you need to calculate the future value of the roof. And then you can calculate the present value of that. What you've got there is the future value formula. Keep in mind that the interest rate used in these formulas is always divided by the number of payments in the year.

the second formula was listed right after specification of 't' = ten years, kind of hidden.

Figured it out.. numbers just werent coming out right but someone showed me how to flip the a for the p and the negative exponent correctly in the final equation.
 
fuck this fucking math class..

1. The price p and the quantity x sold of a certain product obey the demand equation.. x=-5p+100, 0<p<20

trying to find Revenue which is xp... substitute x, = (-5p+100)p which equals 100-5p^2, but this apparently isnt the correct answer. Although I disagree.

2. A drum in the shape of a right circular cylinder is required to have a volume of 200 cubic centimeters. The top and bottom are made of material that costs 4 cents per square centimeter; the sides are made of material that costs 4 cents per square centimeter. Hint: The volume V of a right circular cylinder of height h and radius r is V=pi(r^2)h

I frankly have no idea how to do that one. Not a clue.

3. Find the domain of the function.

f= |x|if -1<x<0
1 if x=0
x^3 if x>0



4. The graph of a piecewise-defined function is given. Write a definition for the function. Choose the answer from the list.
points on the graph are (-1,1) (0,2) (2,1)
 
fuck this fucking math class..

1. The price p and the quantity x sold of a certain product obey the demand equation.. x=-5p+100, 0<p<20

trying to find Revenue which is xp... substitute x, = (-5p+100)p which equals 100-5p^2, but this apparently isnt the correct answer. Although I disagree.


1. x = -5p + 100

Let's restate this as a function of price in terms of x

5p = 100 - x
p = 20 - x/5

Revenue is the quantity sold multiplied by the price sold at.

R(x) = xp = x(20 - x/5) = 20x - x²/5
 
3. Find the domain of the function.

f= |x|if -1<x<0
1 if x=0
x^3 if x>0

The domain would be [-1] U [0,infinity).

For #2, I don't think you included the whole problem.

For #4, you need the graph to determine which functions are combined to make up the piece-wise defined function.
 
Find the power function that the graph of -9x^8+5x^2 resembles for large values of x . That is, find the end behavior of the polynomial function.


Enclosing a Rectangular Field David has available 800 yards of fencing and wishes to enclose a rectangular area. If x designates the width of the rectangle, for what value of x is the area largest? What is the maximum area?


if 9^-x=2, what does 9^3x equal?

(i factored out the negative 1 from the exponent to get 9^x(-1)=2 and got an answer for x of something like .35 but when I enter that into the second equation, it no likey.)
 
Find the power function that the graph of -9x^8+5x^2 resembles for large values of x . That is, find the end behavior of the polynomial function.


Enclosing a Rectangular Field David has available 800 yards of fencing and wishes to enclose a rectangular area. If x designates the width of the rectangle, for what value of x is the area largest? What is the maximum area?


if 9^-x=2, what does 9^3x equal?

(i factored out the negative 1 from the exponent to get 9^x(-1)=2 and got an answer for x of something like .35 but when I enter that into the second equation, it no likey.)


Sweet Jesus, i almost had an aneurysm reading that...
 
yea, this shit can get insane and generally takes too much of a certain form of brainpower I dont possess, but when I get shit correct, I feel like the smartest person in the world..

look at how to solve the exponent one;

9^-x=2
9^(3) =? = 9^((-x)-3) = 2^(-3) = (1/2)^3 = 1/8


got the second and third right, just dont even know what the first question is asking frankly

edit: nevermind, miraculously guessed it right.

Ring girl is paying me 500 bucks to take her calculus class online. im like.. I failed that class.. oh well, I'll have a lot of practice by fall semester
 
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Find the power function that the graph of -9x^8+5x^2 resembles for large values of x . That is, find the end behavior of the polynomial function.
well the end behavior would just be -9x^8, so the limits as x -> infinity and negative infinity are both negative infinity. i think that is what its asking.


Enclosing a Rectangular Field David has available 800 yards of fencing and wishes to enclose a rectangular area. If x designates the width of the rectangle, for what value of x is the area largest? What is the maximum area?
2x + 2y = 800 yards. a = x x y. y = 400- x. a = x x (400 - x), so a = 400x - x^2. x cannot be negative, so x has to be less than 400 yards. as a result, [0,400] is the interval we want to maximize x on... take the derivative: a' = 400 - 2x.. so x = 200 is a critical point.. evaluate critical points and endpoints (0,200,400).. gives (0, 40000, 0) respectively. so x=200.

if 9^-x=2, what does 9^3x equal?

(i factored out the negative 1 from the exponent to get 9^x(-1)=2 and got an answer for x of something like .35 but when I enter that into the second equation, it no likey.)
log base 2 of 9 = -x.. x = -.3154648768, 9^3x = 1/8.

I think I did those right..
 
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yup 3/3

I still dont understand the concept of 'end behavior'. I know that its the first term of the quad. formula (in this instance and probably all other instances I'll see) but I just dont understand what 'end behavior' is. Has something to do with being the integral part that forms the shape of a graphed equation?

2nd was right, I did it the same way

3rd was right.. I did it like you did it initially but abbreviated the decimal too much which gave me a weird answer when inserting it into 9^3x.. I like the other way better, where you find like terms and then replace said term in the second equation with the given answer.. 9^3x = 9^-x(-3)= 2^(-3) = 1/2^3 = 1/8
 
yup 3/3

I still dont understand the concept of 'end behavior'. I know that its the first term of the quad. formula (in this instance and probably all other instances I'll see) but I just dont understand what 'end behavior' is. Has something to do with being the integral part that forms the shape of a graphed equation?

2nd was right, I did it the same way

3rd was right.. I did it like you did it initially but abbreviated the decimal too much which gave me a weird answer when inserting it into 9^3x.. I like the other way better, where you find like terms and then replace said term in the second equation with the given answer.. 9^3x = 9^-x(-3)= 2^(-3) = 1/2^3 = 1/8
The way I think of end behavior is basically how the function will behave as it approaches infinity... which, as it approaches infinity, is like the term with the highest power of x since the highest power of x will always be higher than the lower powers. Its hard to comprehend tbh, but things of that nature like infinity typically are. Only thing Ive used it for is limits to infinity which are used for finding horizontal asymptotes and stuff.
 
1. Suppose that ln3=a and ln5=b . Use properties of logarithms to write the logarithm in terms of a and b.

session.quest828258entrance1_N1005D.mml



so I get that the 15 is A*B, but I'm not exactly sure what its asking for
 
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If Dave k is in a car driving 55mph while Steve blows him is he still gay and how long before he is pulled over and arrested for no reason
 
normally 4 inches, 5 on a good day
 
Relations & Functions???

#1 Walking
Is the time you take to go to the library a function of the distance to the library. Explain.


#2 Sewing
Is the price of a piece of cloth a function of the length of the cloth? Explain.

#3
Is the number of buses used for a field trip a function of the number of students on the field trip. Explain.


Yes, i'm a moron...i have no idea what the hell they are asking. :chuckles:

Thanks!! Old school rep awaits.
 
Relations & Functions???

#1 Walking
Is the time you take to go to the library a function of the distance to the library. Explain.


#2 Sewing
Is the price of a piece of cloth a function of the length of the cloth? Explain.

#3
Is the number of buses used for a field trip a function of the number of students on the field trip. Explain.


Yes, i'm a moron...i have no idea what the hell they are asking. :chuckles:

Thanks!! Old school rep awaits.

This is how I understand it...

The way to look at this is: how would you graph it? There is an independent variable and a dependent variable.

#1 Yes. The time it takes you to walk somewhere will be a function of distance.

#2 No. The price of cloth would be a function of area, not length.

#3 Yes. The number of buses needed would be a function of occupancy.
 

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