STAAR Algebra

Which graph best represents -5y = -6x + 15? (Hint: put it in slope-intercept form.)

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A baker determined the annual profit in dollars from selling pies using p(n) = 52n -0.05n², where n is the number of pies sold. What is the annual profit if the baker sells 400 pies?

• $20,780

• $12,800

• $28,800

• $20,760

A student worked out at a gym continuously for 50 minutes. The graph show the remaining percentage of the workout as a linear function of x, the time in minutes. Which answer choice best describes the domain and range of the function for this situation?

• Domain: All real numbers greater than or equal to 0 and less than or equal to 100

  Range: All real numbers greater than or equal to 0 and less then or equal to 50

• Domain: {-2}

  Range: {100}

• Domain: All real numbers greater than or equal to 0 and less then or equal to 50

  Range: All real numbers greater than or equal to 0 and less than or equal to 100

• Domain: {100}

  Range: {-2}

The table shows the amount of pet food in cups remaining in an automatic feeder as a function of the number of meals the feeder has dispensed. Based on the table, which function models this situation?

The table shows a linear relationship between x and y. What is the rate of change of y with respect to x?

• -38

• 38

• 7.6

• -7.6

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

At a restaurant, jars of tomato sauce are stored in boxes in the pantry. Each box contains 8 jars of tomato sauce. A cook uses 2 jars from 1 of those boxes. Which function shows the relationship between y, the total number of jars of tomato sauce remaining in the pantry, and x, the number of boxes in the pantry.

• y = 8x + 6

• y = 8x

• y = 8x - 2

• y = 6x

Which expression is equivalent to -28x² + 35x ?

• 7x (4x + 5)

• -7x (4x - 5)

• 7x (4x - 5)

• -7x (4x + 5)

The water level of a river was measured each day during a two-week period. The graph models the linear relationship between the water level and number of days it was measured. Which statement best describes the y-intercept of the graph.

• The water level increased by 0.25 ft per day

• The maximum water level is 19.5 ft

• The initial water level was 16 ft

• The water level was measured for 14 days