STAAR Day 7 Review

The total distance in centimeters a toy robot moves varies directly with the time in seconds. The toy robot moves a total distance of 264 centimeters in 11 seconds.

What is the time in seconds the toy robot moves when the total distance is 408 centimeters?

• 24 s

• 17 s

• 13 s

• 37 s

The value of  $y$  is directly proportional to the value of  $x.$  If  $y=35$  when  $x=140,$  what is the value of  $y$  when  $x=70?$  

Which situation does NOT show causation?

• When the student population at a school increases, the number of teachers at the school increases.

• When the amount of sugar in a quart of apple juice is reduced, there are few calories in each serving.

• When there are more workers on a project, the project is completed in less time.

• When there is more protein in an athlete's diet, the athlete scores more points in a game.

The table shows the heights and the lengths of several rectangles.

What does the correlation coefficient for the data indicate about the strength of the linear association between the height and the length of these rectangles?

• Weak negative correlation

• Strong negative correlation

• Weak positive correlation

• Strong positive correlation

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.

Based on the table, what is the best prediction of the number of clicks on the advertisement if 1,500 people visit the website?

• 77

• 137

• 83

• 105

Which graph best represents this system of equations and its solution?

 $8x-4y=-16$  
 $3x+15y=-6$  

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A system of equations is graphed on the grid.

Which system of equations does the graph represent?

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Which graph represents a system of equations with no solution?

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The line graphed on the grid represents the first of two equations in a system of linear equations.

If the graph of the second equation in the system passes through the points  $\left(-12,\ 20\right)$  and  $\left(4,\ 12\right),$  which statement is true?

• The only solution to the system is  $\left(10,\ 5\right).$  

• The only solution to the system is  $\left(0,\ 14\right).$  

• The system has no solution. 

• The system has an infinite number of solutions. 

What is the solution to this system of equations?

• $\left(6,\ 7\right)$

• $\left(2,\ 33\right)$

• $\left(7,\ 6\right)$

• $\left(33,\ 2\right)$