1st QUARTER 1st SUMMATIVE TEST MODULES 1 and 2 GEN. MATH

Which of the following is a set of ordered pair/s (x,y) such that for each value of x there corresponds only one value of y?

• Function

• Relation

• Domain

• Range

Which of the following equations represents a function?

• $x^2+y^2=4$

• $y=±\sqrt{\left(x-2\right)}$

• $y^2=x^2-1$

• $y=-\frac{1}{5}x+8$

Which of the following relations is a function?

• A. y={(3,4), (3,5), (4,6), (4,7)}

• B. y={(1,5), (2,6), (3,8), (4,8)}

• C. y={(1,3), (1,4), (1,5), (1,6)}

• D. y={(1,5), (2,6), (2,7), (3,8), (4,9)}

Which of the following graphs can be a graph of a function?

• 
• 
• 
• 

Suppose the cost of buying a meal is Php 32. Which of the function C represents the cost of buying x meals

•   $C(x)=32+x$

•   $C(x)=32x$

•   $C(x)=\frac{32}{x}$

• $C(x)=\frac{x}{32}$

Suppose the function C(x)=32x represents the cost of buying x meals. If a person has paid Php 160 how many meals did he/ she buy?

• 4

• 5

• 6

• 7

The function for the height of an object dropped from a 100-meter tall platform at time t seconds is approximated by   $H\left(t\right)=-5t^2+100$  . (This formula is based on an approximated value for the acceleration  $g=10m/s^2$ due to gravity).
  What is the height of the object after 3 seconds?

• 80 meters

• 70 meters

• 55 meters

• 45 meters

The new income tax table considering TRAIN LAW (Tax Reform for Accelaration and Inclusion Law) as of January 2018 can be represented by the given piecewise function where T is the income tax to pay and x is the annual income.

Suppose a person has an annual income of Php 300,000, How much does he/she need to pay for his income tax?

• Php 60,000

• Php 50,000

• Php 30,000

• Php 10,000

What is the value of f(6) if  $f(x)=(-\frac{12}{x})^4$ ?    * Note: the quantity is being raised to the 4th power.

• -16   

• -8

•  8

• 16

10. Given f(x)=2x+6. What is the sum of f(-5) and f(3)?

• 8

• 11

• 16

• 28