Unit 4 Mid Unit Assessment Review

Function  $f$  gives the temperature, in degrees Celsius,  $t$  hours after midnight.
Choose the equation that represents the statement: “At 1:30 p.m., the
temperature was 20 degrees Celsius.”

•  $f\left(1:30\right)=20$  

•  $f\left(1.5\right)=20$  

•  $f\left(13:30\right)=20$  

•  $f\left(13.5\right)=20$  

 $f\left(x\right)=2x+4$  

Which description represents this function?

• To get the output, add 4 to the input, then multiply the result by 2.

• To get the output, add 2 to the input, then multiply the result by 4.

• To get the output, multiply the input by 2, then add 4 to the result.

• To get the output, multiply the input by 4, then add 2 to the result.

Function  $C$  gives the cost, in dollars, of buying  $n$  apples. Which statement best represents the meaning of  $C\left(10\right)=9$  ?

• The cost of buying 9 apples

• The cost of 9 apples is $10

• The cost of 10 apples

• Ten apples cost $9

Function  $g$   is represented by the graph. For what input value or values is  $g\left(x\right)=4$  ?

• 2

• -2 and 2

• 16

• none

This graph represents Andre's distance from his bicycle as he walks in a park. Select all of the True statements.

• The graph has multiple horizontal intercepts.

• A horizontal intercept of the graph represents the time when Andre was with his bike.

• A minimum of the graph is $\left(17,\ 1\right)$

• The graph has two maximums.

• About 21 seconds after he left his bike, he was the farthest away from it, at about 8.3 feet.

Function $j$   gives the weight of a dog, in kilograms, when it is  $m$   months old. Which statement  represents the meaning of the equation  $j\left(8\right)=7$  in this situation?

• The dog weighs 8 kilograms when it is 
  
  7 months old

• The dog weighs 7 kilograms when it is 
  
  8 months old

• The weight of the dog has been 8 kilograms 
  
  for 7 months

• The dog weighs 7 kilograms 
  
  when it is 8 years old.

Function  $d$  gives the distance of a boat from the dock  $t$  seconds after leaving the dock in meters. The graph  represents  $d$  . Select all statements in function notation that represent the function.

•  $d\left(30\right)=d\left(70\right)$  

•  $\ \ d\left(40\right)>d\left(120\right)$  

•  $d\left(0\right)=60$  

•  $d\left(160\right)=39$  

A ball bounces several times after it is dropped. The graph shows the height of the ball over time.Height is measured in meters and time is measured in seconds. Select all statements that are true about the graph and the situation it represents.

• The vertical intercept shows the time when the ball hits the ground.

• The function reaches its maximum value after the first bounce.

• The function has no minimum value.

• There are multiple times when the function is at its minimum value.

• The function has the maximum value at the vertical intercept.

Function R gives the amount of rain measured by a rain gauge t hours since it started raining in millimeters. Which of the following represents Seven hours after it started raining, the amount of rain was 12 millimeters.

• $R\left(7\right)=12$

• $R\left(12\right)=7$

• $R\left(t\right)=34$

• $R\left(t\right)=Sun$

Function R gives the amount of rain measured by a rain gauge t hours since it started raining in millimeters. Which of the following represents the amount of rain 2 hours after it started raining was the same as the amount 3 hours after it started raining.

• $R\left(3\right)>R\left(2\right)$

• $R\left(20\right)=R\left(3\right)$

• $R\left(2\right)=R\left(3\right)$

• $R\left(3\right)=R\left(2\right)$