Staar Quadratic Functions

Which quadratic function in vertex form can be represented by the graph that has a vertex at (3, -7) and passes through the point (1, -10)?

Which graph best represents a quadratic function that has only one zero?

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The graph of quadratic function f is shown on the grid.

What is the y-intercept of the graph of f?

The graph of a quadratic function is shown on the grid.

Which equation best represents the axis of symmetry?

The graph of f\left(x\right)=x^2 was transformed to create the graph of g\left(x\right)=f\left(x\right)-9 . Which statement about the graphs is true?

• The graph of g is a reflection of the graph of f across the x-axis.

• The vertex of the graph of g is 9 units to the right of the vertex of the graph of f.

• The graph of g is a reflection of hte graph of f across the y-axis.

• The y-intercept of the graph of g is 9 units below the y-intercept of the graph of f.

The graph of f(x)=x^2 is shown on the grid.

Which statement about the relationship between the graph of f and the graph of g(x)=7f(x)?

• The graph of g is narrower than the graph of f.

• The graph of g is wider than the graph of f.

• The graph of g is 7 units below the graph of f.

• The graph of g is 7 units above the graph of f.

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?

A projectile is launched into the air from the ground. The table shows the height of the projectile, h(t), at different times. Based on the table, which function can best be used to model this situation?

The graph of quadratic function k is shown on the grid.

Which statements are best supported by the graph of k?

• and #2 only

• and #3 only

• and #3 only

• , #2, and #3