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Akimi4 [234]
3 years ago
7

Remember to show work and explain.

Mathematics
2 answers:
Anna007 [38]3 years ago
8 0

Answer:  f(x) = 2(1/3)ˣ,   D: x is All Real Numbers,   R: y > 0

<u>Step-by-step explanation:</u>

f(x) = a(b)ˣ

  • a represents the y-intercept
  • b represents the common ratio

The graph shows the y-intercept as 2   ⇒     a = 2

f(2) \div f(1)\ \text{is the common ratio}\\\\\dfrac{2}{9}\div\dfrac{2}{3}=b\implies \dfrac{2}{9}\times\dfrac{3}{2}=b\implies \dfrac{1}{3}=b

f(x)=2\bigg(\dfrac{1}{3}\bigg)^x

Domain: there are no restrictions on the x-value ⇒ x is All Real Numbers

Range: there are no values of x that will result in the y-value being 0 or negative, so y > 0.

We can show this algebraically by taking the log of both sides of the equation.  

log y = log 2(1/3)ˣ    

<em>You cannot take the log of 0 or a negative number so y has to be greater than 0.</em>

Ostrovityanka [42]3 years ago
8 0

Using given,

f(0)=2=2/1=2/3°

f(1)=2/3=2/3¹

f(2)=2/9=2/3²

...........................

Similarly

f(x)=2/(3^x)

[Explanation: All I did here is find a pattern or behaviour of function with the help of given values of function (for x=0,1,2). You can clearly see that numerator in f(0),f(1) and f(2) remains constant while denominator follows the pattern 3ⁿ . So given function has to be equal to 2/3ⁿ]

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Y-intercept means where does the given function cuts the graph at y-axis. It cuts y-axis at 2, so,

Y-intercept=2

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To find common ratio,

f(1)/f(0)=(2/3)/2=1/3

f(2)/f(1)=(2/9)/(2/3)=1/3

Therefore,

common ratio=1/3

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The equation for function will be same as function but f(x) will be replaced by y,

y=2/(3^x)➡️is the required equation

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Since the given function is exponential function, its domain will be always (-∞,+∞) no matter what shifts or translations.

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The graph seems to touch x-axis or the line y=0 but never reach or touch y=0 .So it doesn't quite reach y=0. Also the graph goes upward in positive direction which means it will increase infinitely in upward or positive direction. So its range will be (0,+∞) which means it will not touch y=0 line and will infinitely increase in positive or upward direction.

----------------------------------------------------------------------------

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Would really appreciate if u could help me with all letters but even a few are great! Thanks (the graph is hard to explain so i
defon
Part A

The equation is b = 36*a or simply b = 36a

We take the size of the farm 'a' and multiply it by 36 to get the number of bushels of corn 'b'.

-----------------------------------

Part B

The 36 means there are 36 times more bushels of corn compared to the size of the farm in acres

For example, if the size is 2 acres then 
b = 36*a
b = 36*2
b = 72
yielding 72 bushels of corn

-----------------------------------

Part C

Along the first row you should have: 25 and 30 in the missing blanks (over 900 and 1080 respectively)

You find this by dividing the value of b over 36
eg: b/36 = 900/36 = 25

-------

Then along the bottom row you should have the following for the blanks: 0, 360, 1800

These values are found by multiplying the 'a' value by 36
eg: if a = 10 then b = 36*a = 36*10 = 360

-----------------------------------

Part D

Plot any two points you want from the table back in part C
So plot say (0,0) and (10,360). Then draw a straight line through those two points.

-----------------------------------

Part E

The point (30,1080) means a = 30 and b = 1080
So if the farm is 30 acres, then it can produce 1080 bushels of corn

Notice how
b = 36*a
b = 36*30 <<-- replace 'a' with 30
b = 180
And how this matches up with the fourth column of the table in part C. So you can use this part to get a hint of how to fill out the table (or at least know what one column looks like)


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