Algebra 1B before break

Which expression is equivalent to

2(x²-1)+3x(x-4)?

• 5x²-5

• 5x²-6

• 5x²-12x-1

• 5x²-12x-2

Bella recorded data and used her graphing calculator to find the equation for the line of best fit. She then used the correlation coefficient to determine the strength of the linear fit. Which correlation coefficient represents the strongest linear relationship?

• 0.5

• 0.9

• -0.3

• -0.8

The expression x⁴-16 is equivalent to

• (x²+8)(x²-8)

• (x²+4)(x²-4)

• (x²-8)(x²-8)

• (x²-4)(x²-4)

The value of the x-intercept for the graph of 4x-5y=40 is

• 10

• -8

•  $\frac{4}{5}$  

• - $\frac{4}{5}$  

What is the value of x in the equation  $\frac{x-2}{3}+\frac{1}{6}=\frac{5}{6}$  

• 4

• 6

• 8

• 11

Which equation has the same solution as 2x²+x-3=0

• (2x-1)(x+3)=0

• (2x+1)(x-3)=0

• (2x-3)(x+1)=0

• (2x+3)(x-1)=0

What is the solution set of the equation (x-2)(x-a)=0

• -2 and -a

• 2 and a

• -2 and a

• 2 and -a