
EOC Functions & Modeling
Presentation
•
Mathematics
•
8th - 10th Grade
•
Medium
+6
Standards-aligned
Darryl Padgett
Used 9+ times
FREE Resource
10 Slides • 31 Questions
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EOC Functions & Modeling
by Darryl Padgett
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What is a composite function?
Can be thought of a series of operations
One function is substituted into another function
Often denoted as f(g(x)) or (f ∘ g)(x)
Read as "f of g of x"
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It is an operation on functions
You are multiplying f(x) and g(x) not substituting functions
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5
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Composite Functions Example
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8
9
Multiple Choice
Which expression represents g(f(x)) if f(x) = 2x - 8 and g(x) = 4x
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Multiple Choice
If f(x) = x2 and g(x) = 3x - 1, find f(g(x))
9x2 - 6x + 1
3x - 1
3x2 - 1
9x2 - 1
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Multiple Choice
g(x) = 3 - x,
what is g(-4) + f(1)?
12
Multiple Choice
g(x) = x - 2
Find g(f(-10))
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Multiple Choice
In 2014, the cost to mail a letter was 49¢ for up to one ounce. Every additional ounce cost 21¢. Which recursive function could be used to determine the cost of a 3-ounce letter, in cents?
𝑎1 = 49;
𝑎𝑛 = 𝑎𝑛−1 + 21
𝑎1 = 0;
𝑎𝑛 = 49(𝑎𝑛 − 1 ) + 21
𝑎1 = 21;
𝑎𝑛 = 𝑎𝑛−1 + 49
𝑎1 = 0;
𝑎𝑛 = 21(𝑎𝑛−1) + 49
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Multiple Choice
Describe the transformation that occurred.
h(x) = f(x) + 2
up 2 units
left 2 units
Vertical Strech
right 2 units
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
g(x) = (x+3)2
g(x) = (x-3)2
g(x) = x2+3
g(x) = x2-2
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Multiple Choice
-f(x) - 2
reflection over y-axis, shift down 2
reflection over y-axis, shift right 2
reflection over x-axis, shift right 2
reflection over x-axis, shift down 2
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Multiple Choice
The height, ℎ, in feet, of an object thrown upward from a height of 144 feet is a function of time, 𝑡, in seconds. The height can be determined by the function ℎ(𝑡)=−16𝑡2 + 128𝑡 + 144 . What is the height of the object at 3 seconds?
144
384
432
672
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Multiple Choice
The number of miles a car can be driven depends on the number of gallons of gas in its tank. The function m = 25g models a situation in which a car gets 25 miles per gallon. If the gas tank holds 20 gallons of gas, which inequality represents its range?
0 ≤ 𝑔 ≤ 20
0 ≤ 𝑚 ≤ 500
𝑚 ≤ 500
𝑔 ≤ 20
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Multiple Choice
Let 𝑓 be a function such that 𝑓(𝑥) = 2𝑥 − 4 is defined on the domain 2 ≤ 𝑥 ≤ 6. The range of this function is
−∞ ≤ 𝑦 ≤ ∞
0 ≤ 𝑦 ≤ 8
0 ≤ 𝑦 ≤ ∞
2 ≤ 𝑦 ≤ 6
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Multiple Choice
Given that 𝑦 is a function of 𝑥, which of the following tables best represents a function? Hint: Remember that each input must have a different output.
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Multiple Select
The domain of the function 𝑓(𝑥) = −3𝑥 is restricted to the negative integers. (The domain is the x values). Which values are elements of the range?
-12
-3
12
7
9
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Multiple Choice
Sue hits a ball from a height of 4 feet. The height of the ball above the ground is a function of the horizontal distance the ball travels until it comes to rest on the ground. What is the maximum height that the ball travels?
0 feet
50 feet
100 feet
200feet
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Fill in the Blanks
Type answer...
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Fill in the Blanks
Type answer...
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Fill in the Blanks
Type answer...
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Fill in the Blanks
Type answer...
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Multiple Select
The function 𝑓(𝑥) = 4𝑥− 𝑥2 is graphed in the
𝑥𝑦-coordinate plane as shown.
Based on the graph of the function, which statements are true? Select ALL that apply.
f is increasing on the interval
0 < 𝑥 < 2.
f is decreasing on the interval
0 < 𝑥 < 2.
f is increasing on the interval
2 < 𝑥 < 4.
f is decreasing on the interval
2 < 𝑥 < 4.
f is increasing on the interval 𝑥 > 4.
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Multiple Select
The function 𝑓(𝑥) = 4𝑥− 𝑥2 is graphed in the
𝑥𝑦-coordinate plane as shown.
Based on the graph of the function, which statements are true? Select ALL that apply.
f(x) < 0 on the interval 𝑥 < 0.
f(x) < 0 on the interval 0 < 𝑥 < 2 .
f(x) ≥ 0 on the interval 0 < 𝑥 < 2 .
f(x) > 0 on the interval 2 < 𝑥 < 4 .
f(x) < 0 on the interval 𝑥 > 4 .
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Multiple Choice
A computer technician charges a one-time fee of $50 plus an additional $20 per hour of labor. If an equation is created to determine the technician's total charge, what does the $50 represent? Hint: create an equation of the line.
slope
coefficient
x-intercept
y-intercept
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Multiple Choice
What is the maximum height of the fire hose water?
4 feet
24 feet
41 feet
45 feet
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Fill in the Blanks
Type answer...
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Fill in the Blanks
Type answer...
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Multiple Choice
The distance in miles, 𝑦, a bicyclist is from home after riding 𝑥 hours is represented by the equation 𝑦 = 8𝑥 + 7. What does the slope represent in this situation?
the number of hours it takes the bicyclist to ride 15 miles
the distance the bicyclist is from home when 𝑥 = 0
the steepness of the hill the bicyclist is climbing
the speed of the bicyclist
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Multiple Choice
Which is the graph of a linear function with a slope of 2 and a y-intercept at (0, 1)?
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Multiple Choice
What is the equation of the function represented by this table of values?
𝑦 = 5𝑥+3
𝑦 = 12𝑥+3
𝑦 = 3∙5𝑥
𝑦 = 5∙3𝑥
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Multiple Choice
Which expression represents the output of the nth term?
𝑛 + 2
𝑛 + 11
2n + 1
2n -1
EOC Functions & Modeling
by Darryl Padgett
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