NC Math I EOC Review - Functions

Which choice is the graph of y = (4 – x)(x + 2)?

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The function f(x) = –0.25x + 5 models the height of a candle x seconds after it is

lit. What is the meaning of the y-intercept of the function?

• the initial height of the candle

• the final height of the candle

• the rate at which the candle is burning

• the amount of time it will take the candle to burn

The total cost, in dollars, of membership in a fitness center is given by the

function c(m) = 20m + 40, where m is the number of months a person is a

member. In dollars, how much is the cost of a membership for 1 year?

A club began with 3 members. Each month, each member brought one new

member. Which function can be used to determine the number of members

x months after the club began?

• f(x) = 2x + 3

• f(x) = 3x + 1

Every ten years, the Census counts how many people are living in every town in

the United States.

• The 2010 Census showed that 1,000 people were living in Appleville,

and 4,000 people were living in Bridgetown.

• The population of Appleville is predicted to double every ten years.

• The population of Bridgetown is predicted to increase by 1,000 every

ten years.

If the predictions come true, what will be the first census year that will show

Appleville with a larger population than Bridgetown?

Which choice could be modeled by a linear function?

• the amount of money, y, in an account after x years earning 4% interest

  compounded annually

• the monthly cost, y, to use a cell phone for x minutes at a rate of

  4 cents per minute

• the amount, y, of radioactive material remaining after x years when decay

  occurs at a rate of 30% each year