LEAP PRACTICE 5 - 8.F.A AND 8.F.B

WHICH OF THE FOLLOWING GRAPHS COULD REPRESENT A FUNCTION? SELECT ALL THAT APPLY.

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CCSS.8.F.A.1

CCSS.8.F.A.3

CCSS.8.F.B.4

CCSS.8.F.B.5

Which of the following tables can represent values of a function? Choose all that apply.

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CCSS.8.F.A.1

Jordan types at a constant rate of 40 words per minute. The number of words typed, y, is a function of the number of minutes spent typing, x.

Which equation models this situation?

• $$y=40x$$

  
  

• y = $\frac{40}{x}$
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• $$y=x+40$$

• $$y=\frac{x}{40}$$

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CCSS.HSF-LE.A.1B

 $y\ =\ 40x$  
Use the following equation to determine the number of words Jordan types in 7.5 minutes.

• 47.5 wpm

• 300 wpm

• 53 wpm

• can not be determined

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CCSS.HSF-LE.A.1B

The table shows a relation.

​Which statement about the relation is correct?

• The relation is a function because each input has exactly one output.

• The relation is a function because each output has exactly one input.

• The relation is not a function because one input has more than one output.

• The relation is not a function because one output has more than one input.

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CCSS.8.F.A.1

Limousine Company P and Company R both charge a rental fee plus an additional charge per hour.

• The equation y=50+30x models the total cost (in dollars), y, of renting a limousine from Company P for x

hours.

• The table shows the cost to rent a limousine from

Company R for different lengths of time.

Which statement accurately compares the per hour charges of the two companies?

• Company P charges $5 less per hour than Company R.

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• Company P charges $5 more per hour than Company R

• Company P charges $25 less per hour than Company R

• Company P charges $25 more per hour than Company R

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CCSS.8.F.A.2

CCSS.HSF.IF.C.9

Which function is linear? Select all that apply.

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  $y\ =\ 6x^{3\ }+8$

• $y\ =\ 4x^3\ +2$

• $y\ =\ x\ +\ 1$

• $y\ =\ 2x\ +\ 8$

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CCSS.8.F.A.3

When a bill is not paid by the due date, a late fee is added each month until the bill is paid. The values in the table represent the total amount due, in dollars, for each month that a payment remains overdue.

Which linear function describes the relationship between the number of months the bill is overdue and the total amount due?

• $y\ =\ 10x\ +\ 500$

• $y\ =\ 2x\ +\ 300$

• $y\ =\ 250x\ +\ 25$

• $y\ =\ 25x\ +\ 250$

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CCSS.8.F.B.4

CCSS.HSF.LE.A.2

The odometer in a car measures the number of miles driven by the car since it was made. During a trip, the odometer reading in Anita’s car is modeled by the function

y=55x +9500 whe re x represents the number of hours driven during the trip and y represents the odometer reading in miles.

What is the meaning of the rate of change in this function?

• The number of miles driven each hour during the trip.

• The total number of miles driven at the beginning of the trip.

• The total number of miles driven at the end of the trip.

• The number of miles driven during the trip.

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CCSS.HSF.LE.B.5

The odometer in a car measures the number of miles driven by the car since it was made. During a trip, the odometer reading in Anita’s car is modeled by the function y=55x + 9500 where x represents the number of hours driven during the trip and y represents the odometer reading in miles.

What was the odometer reading, in miles, before Anita’s trip?

• 9555

• 55

• 9500

• 0

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CCSS.HSF.LE.B.5