Algebra 1 STAAR released Questions

Which function is best represented by the graph?

• $g\left(x\right)=6\left(\frac{1}{3}\right)^x$

• $g\left(x\right)=6\left(3\right)^x$

• $g\left(x\right)=\ 6-\left(\frac{1}{3}\right)^x$

• $g\left(x\right)=6-\left(3\right)^x$

What is the equation in slope-intercept form of the line that crosses the x-axis at 36 and is perpendicular to the line represented by 4 y = − x + 5 9 ?

• $y=\frac{4}{9}x+16$

• $y=\frac{4}{9}x-16$

• $y=\frac{9}{4}x+81$

• $y=\frac{9}{4}x-81$

What is the positive solution to this equation?

4x² + 12x = 135

• 7.5

• 0

• -7.5

• 4.5

Which expression is equivalent to

(10 + 7r− r²) + (−6r² − 18 + 5r)?

• $-7r^2+2r+8$

• $7r^2+12r+78$

• $-7r^2+12r-8$

• $7r^2+2r-8$

A company collected data for the number of text messages sent and received using a text-message application since October 2011. The table shows the number of text messages sent and received in billions over time. The data can be modeled by a quadratic function.

• $n\left(t\right)=-0.002t^2+0.55t+5.02$
  

• $n\left(t\right)=0.072t^2-0.15t+2.73$

• $n\left(t\right)=-0.002t^2+5.02$

• $n\left(t\right)=0.072t^2+2.73$

A company advertises on a website. A worker tracked the number of visits to the website and the number of clicks on the advertisement. The table shows the data for several days. A linear function can be used to model the data.

• 77

• 137

• 83

• 105

The graph of a linear function is shown on the grid. Which equation is best represented by this graph?

• $y+2=\frac{7}{5}\left(x+7\right)$

• $y-2+\frac{7}{5}\left(x-7\right)$

• $y+2=\frac{5}{7}\left(x+7\right)$

• $y-2=\frac{5}{7}\left(x-7\right)$

Which expression is equivalent to (xy^-6)² for all values of x and y where the expression is defined?

• $xy^{-36}$

• $xy^{36}$

• $x^2y^{-12}$

• $x^2y^{12}$

The graph of linear function f passes through the point

(1, −9) and has a slope of -3. What is the zero of f ?

• 2

• 4

• -6

• -2

 $Given\ the\ function,\ h\left(x\right)=29\left(5.2\right)^x$ What is the value of the y-intercept of the graph of the function?