Which expression is equivalent to

 $121x^2-64y^2$  

• (11x – 16y)(11x + 16y)

• (11x – 16y)(11x – 16y)

• (11x + 8y)(11x + 8y)

• (11x + 8y)(11x – 8y)

Which expression is a factor of

 $24x^2+16x+144$  ?

• 16

• 8x

•  $3x^2+2x+18$  

•  $8(x-2)\left(3x^2+9\right)$  

What is the vertex of the graph of

 $f\left(x\right)=x^2+10x-9?$  

• (-5,-34)

• (5, -9)

Which of these is the result of completing the square for the expression

 $x^2+8x-30?$  

•  $\left(x+4\right)^2-30$  

•  $\left(x+4\right)^2-46$  

• 3 feet

• 2 feet

• 1 feet

• -12 feet

• x = –4, x = 3

• x = –3, x = 4

• x = –2, x = 3

• x = –6, x = 2

• . 0.9

• 1.5

• 2.0

• 9.0

• 1.5 inches

• -6.5 inches

• 1.5 and -6.5 inches

• 2 seconds

• 3 seconds

• 4 seconds

• 5 seconds

• 0 < t < 5

• 0 < t < 25

• all real numbers

• all positive integers