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Algebra 1

7.4.5 Practice

Algebra 17.4.5 Practice

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Complete the following questions to practice the skills you have learned in this lesson.

Use the following to answer questions 1 – 7.

The table shows values of the expressions 10 x 2 and 2 x .

x 10 x 2 2 x
1 10 2
2 40 4
3 90 8
4 160 16
8    
10    
12    
  1. Complete the statement.
    1. When the value of x increases by 1 , the expression 10 x 2 :
  1. Changes logarithmically. It has decreased by one-half.
  2. Grows by decreasing amounts but by increasing growth factors.
  3. Changes exponentially. It doubles.
  4. Grows by increasing amounts but by decreasing growth factors.
    1. When the value of x increases by 1 , the expression 2 x :
  1. Changes logarithmically. It has decreased by one-half.
  2. Grows by decreasing amounts but by increasing growth factors.
  3. Changes exponentially. It doubles.
  4. Grows by increasing amounts but by decreasing growth factors.
  1. Will the value of 10 x 2 be greater than or less than 2 x when x is 8 ?
  1. less than
  2. greater than
  1. Will the value of 2 x be greater than or less than 10 x 2 when x is 10 ?
  1. less than
  2. greater than
  1. Will the value of 10 x 2 be greater than or less than 2 x when x is 12 ?
  1. less than
  2. greater than
  1. Determine the following values of 10 x 2 .

    1. What is the value of 10 x 2 when x is 8 ?
    1. What is the value of 10 x 2 when x is 10 ?
    1. What is the value of 10 x 2 when x is 12 ?
  1. Determine the following values of 2 x .

    1. What is the value of 2 x when x is 8 ?
    1. What is the value of 2 x when x is 10 ?
    1. What is the value of 2 x when x is 12 ?
  1. Choose the best statement that describes how the values of the exponential expression 2 x and the quadratic expression 10 x 2 change as x becomes greater and greater.
  1. There is no change in the values of the expressions when x increases.
  2. They both grow at the same rate.
  3. The value of the quadratic expression grows much more quickly as x increases.
  4. The value of the exponential expression grows much more quickly as x increases.
  1. Answer the following questions about functions f ( x ) and g ( x ) .

    1. What type of expression is f ( x ) = 1.5 x ?
  1. linear
  2. quadratic
  3. exponential
    1. What type of expression is g ( x ) = 500 x 2 + 345 x ?
  1. linear
  2. quadratic
  3. exponential
    1. The values of which function will eventually be greater for larger and larger values of x ?
  1. Function g ( x )
  2. Function f ( x )
  1. The table shows the values of 4 x and 100 x 2 for some values of x .
    x 4 x 100 x 2
    1 4 100
    2 16 400
    3 64 900
    4 256 1 , 600
    5 1 , 024 2 , 500
    Table 7.4.0

    Looking at the patterns in the table, choose the best answer to explain why, as the value of x increases, the values of the exponential expression 4 x will eventually overtake the values of the quadratic expression 100 x 2 .

  1. The value of 100 x 2 grows by a factor of x every time and the value of 4 x grows by different factors.
  2. The value of 100 x 2 grows by different factors and the value of 4 x grows by a factor of x every time.
  3. The value of 100 x 2 grows by a factor of 4 every time and the value of 4 x grows by different factors.
  4. The value of 100 x 2 grows by different factors and the value of 4 x grows by a factor of 4 every time.
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