Name: ______Teacher: ______Date: _____

STAAR Skills Practice 4

______1. Which of the following best describes a function?

[A] A special type of relation that pairseach domain value with exactly one range value.

[B] A special type of relation that pairs each range value with exactly one domain value.

[C] A relation that has no correlation.

[D] A relation that is a positive correlation.

______2. Determine a relationship between the x- and y- values. Write an equation

x / 1 / 2 / 3 / 4
y / 4 / 7 / 10 / 13

[A] y = x + 4

[B] y = 3x + 1

[C] y = x + 3

[D] y = -x + 3

______3. Alicia’s mom wants to know how much Alicia spent renting a tube at Splashtown. The cost was $3 for each hour the tube was rented. What is the dependent variable?

[A] The $3 dollar charge

[B] The total cost of renting the tube

[C] The number of hours the tube is rented

[D] The size of the tube

______4. A relation exists between a toy store’s profit and the number of toys it sells. In this relation, what is the independent variable?

[A] The number of hours the store is open

[B] The number of toys the store sells

[C] The store’s profit

[D] The price of each toy

______5. If f(x) = 2x2 + 3x - 1 then what is the value of f(-2)?

[A] -15

[B] 1

[C] 13

[D] -3

______6. Give the domain and range of the relation.

[A] D: –3x1; R: –4y4

[B] D: –5x4; R: –3y1

[C] D: –2.25x0; R: 0y4

[D] D: –3 x1; R: –5y 4

______7. Give the domain and range of the relation. Tell whether the relation is a function.

x / y
1 / –5
2 / –1
3 / 3
4 / 6

[A] D: {1, 2, 3, 4}; R: {–5, –1, 3, 6}. The relation is a function.

[B] D: {–5, –1, 3, 6}; R: {1, 2, 3, 4}. The relation is a function.

[C] D: {1, 2, 3, 4}; R: {–5, –1, 3, 6}. The relation is not a function.

[D] D: {–5, –1, 3, 6}; R: {1, 2, 3, 4}. The relation is not a function.

______8. For f(x) = -4x + 2, find f(x) when x = -3.

[A] -10

[B] 10

[C] 14

[D] -14

Use the graph to the right to answer questions 16-20.

9. Is this data discrete or continuous?

10. What is the domain?

11. What is the range?

12. Circle the appropriate answer below:

The (number of designs/total sales) depends on the

(total sales/number of designs).

13. What is the value of f(80)? ______

For questions 14-15, is the following a function? Circle yes or no.

14. YESNO