Regents practice #1

What are the zeros of the function f(x) = x² — 13x — 30? 

Use y= look and the table. When does the equation equal 0?

• —10 and 3
• 10 and —3
• —15 and 2
• 15 and —2

What is one point that lies in the solution set of the system of inequalities graphed?

• (0, 4)
• (-4, 1)
• (2, 4)
• (4, -1)

Which correlation coefficient indicates the strongest linear relationship between the variables?

• 0.79
• -0.63
• 0.52
• -0.84

Which function represents exponential decay?

Use y= if need and graph to check answer.

• f(x) = 100(0.9)^x 
• f(x) = 10(1.09)^x 
• f(x) = 1.9^x
• f(x) = ½(9)^x

Given f(x) = -4x - 10 and f(x) = 10. Find x

Use the calculator, find x when the answer is 10.

• x = -5
• x = 5
• x = -50
• x = 30

What are the x- intercepts?

Where do we cross the x axis?

• x= 0 and x= -4
• x= 0 and x= 4
• y= 0
• x= 2

How many solutions does this graph have?

How many times does the graph cross the x axis?

• one
• two
• no solutions
• cannot be determined

The function f(x)=2x+8 models the total cost to order x amount of light bulbs from an online company. What is the appropriate domain of the function?

How do we count light bulbs?

• All non-negative integers

  positive numbers

• All non-negative rational numbers

  decimal numbers

• All integers

  negative numbers

• All rational numbers

  decimal numbers

The function f(x)=3x+10 models the total cost Katie charges to babysit x amount of children. What is the most appropriate domain for the function?

How do we count children?

• All rational numbers

  decimal numbers

• All integers

  negative numbers

• All non-negative rational numbers

  decimal numbers

• All non-negative integers

  positive whole numbers

What is the equation for this line?

• y = x - 2
• y = x + 2
• y = 2x
• y = -x + 2