Mathletes 5.1

What is the equation for this line?

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

Find the solution to the following inequality:

6(x - 5) < 7x - 4

• x ≥ 26

• x > -26

• x < -26

• -x > 26

If A = 3x² - 6x  and B = 12x- 6x², what is B - A?

• -9x² + 18x
• 9x² - 18x
• -3x² + 6x
• -3x²

What is another word for zeros?

• y-intercepts
• roots
• vertex
• axis of symmetry

Find the difference:
(2x + 7) - 3(5x - 4)

• -13x - 5
• 17x + 5
• 17x + 5
• -13x + 19

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

• —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?

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

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?

• All rational numbers
• All integers
• All non-negative rational numbers
• All non-negative integers