Regents Review Algebra

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

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

• x = -5

• x = 5

• x = -50

• x = 30

How many solutions does this graph have?

• one

• two

• no solutions

• cannot be determined

What is another word for zeros?

• y-intercepts

• roots

• vertex

• axis of symmetry

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?

• All non-negative integers

• All non-negative rational numbers

• All integers

• All rational 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?

• All rational numbers

• All integers

• All non-negative rational numbers

• All non-negative integers

What are the x- intercepts?

• x= 0 and x= -4

• x= 0 and x= 4

• y= 0

• x= 2

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

• -9x² + 18x

• 9x² - 18x

• -3x² + 6x

• -3x²

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