STAAR Review Day 3 Practice

Which function is equivalent to  $f\left(x\right)=-4\left(x+7\right)^2-6?$  

•  $f\left(x\right)=-4x^2-56x-202$  

•  $f\left(x\right)=-4x^2+14x+43$  

•  $f\left(x\right)=-4x^2-56x-172$  

•  $f\left(x\right)=-4x^2+190$  

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.

Which function best models the data?

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

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

• $n\left(t\right)=-0.002t^2+5.02$

• $n\left(t\right)=0.072t^2+2.73$

Which function is best represented by the graph?

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The graph of quadratic function  $g$  is shown on the grid.  The coordinates of the x-intercepts, the y-intercept, and the vertex are integers.

What is the maximum of  $g?$  

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The graph of quadratic function  $p$  is shown on the grid. 

If  $k\left(x\right)=x^2$  and  $p\left(x\right)=k\left(x\right)+n,$  what is the value of  $n?$