Review 1st Quarter

Which of the following set of ordered pairs does not represents a function?

• {(9, 5), (10, 5), (4,-5), (8,-5)}

• {(3, 4), (4,-3), (7, 4), (3, 8)}

• {(6,-5), (7, -3), (8, -1), (9, 1)}

• {(2, -2), (5, 9), (-5, -7), (1, 4)}

Answer explanation

A set of ordered pairs is a function if the domain does not have the same x-values. There should be no repeating number on the domain.

Which table of values is a function?

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Answer explanation

A table of values is a function if the domain does not have the same x-values. There should be no repeating number on the domain.

Which graph is a function?

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Answer explanation

A graph is a function if it satisfies the Vertical Line Test. That means the vertical line and the graph should have only one intersection.

Which equation best describes the relationship between the values of x and y shown in the table?

• y = 3x+1

• y = 2x+1

• y = x+1

• y = x

Answer explanation

Substitute the values of the domain on the given function. If the resulting answer is the same as the values of the range, that is the function of the given table of values.

The parking fee in a mall costs Php 50.00 for the first three hours and an additional Php 15.00 per hour (or a fraction of it) for succeeding hours. Represent your parking fee using the function f(t), where t is the number of hours you park in the mall.

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The parking fee in a mall costs Php 50.00 for the first three hours and an additional Php 15.00 per hour (or a fraction of it) for succeeding hours. How much is the parking fee if you park your car for 6 hours?

• Php 50.00

• Php 65.00

• Php 80.00

• Php 95.00

Answer explanation

Evaluate the function when t=6, use the 2nd equation.

The parking fee in a mall costs Php 50.00 for the first three hours and an additional Php 15.00 per hour (or a fraction of it) for succeeding hours. How much is the parking fee if you park from 12:20 PM to 10:45 PM?

• Php 155.00

• Php 170.00

• Php 185.00

• Php 200.00

Answer explanation

From 12:20 PM to 10:45 PM, From 12:20 PM to 10:45 PM, you park your car for 10 hrs and 25 mins. Since the mall charges a fraction of an hour, the mall will charge you for 11 hours. Evaluate the function when t=11. Use the 2nd equation.

If f(x) = 2x - 3, find f(2) + f(-3)

• -10

• -9

• -8

• -7

Answer explanation

Evaluate the function when x=2 and x=-3, then add your answers.

• x² - 4x + 3

• x² + 3

• x² + 3x - 4

• x² + 4x - 3

Which of the following is a rational function?

Answer explanation

The numerator and denominator of rational functions should be a polynomial function. That means the exponents are positive whole numbers only.