4.3.5 Practice

4.3.5 Practice

4.3.5 • Practice

Complete the following questions to practice the skills you have learned in this lesson.

1. Function $f$ gives the temperature, in degrees Celsius, $t$ hours after midnight.
   
   Choose which equation or expression represents the statement in function notation.

1. The temperature was the same at 9 a.m. and at 4 p.m.

1. $f(9)=f(16)$
2. $f(9)=f(4)$

2. It was warmer at 9 a.m. than at 6 a.m.

1. $f(9)$<$f(6)$
2. $f(9)$ > $f(6)$

3. Some time after midnight, the temperature was 24 degrees Celsius.

1. $f(12)=24$
2. $f(t)=24$
4. $f(24)=t$

2. Select the two points that are on the graph of $f$ if we know that $f(2)=-<!--\; -\; -->4$ and $f(5)=3.4$.

1. (–4, 2)
2. (2, –4)
3. (3.4, 5)
4. (5, 3.4)
5. (2, 5)

3. Looking at the graph of the function $g$, below, which is greater, $g(-<!--\; -\; -->5)$ or $g(5)$?

1. $g(-<!--\; -\; -->5)$
2. $g(5)$

4. The function $T$ tells how many people are living on floor $n$ of an apartment building. What does $T(4)=82$ mean?

1. There are 4 people living on floor 82.
2. There are 82 people living on floor 4.

5. The function, $T$, gives the temperature of a house, in degrees Fahrenheit, $h$ hours after midnight. Choose which function notation represents the temperature at 6 a.m. was 70 degrees.

1. $70(T)=6$
2. $6(T)=70$
3. $T(6)=70$
4. $T(70)=6$

6. The graph below represents a function, $f$, which gives the height of a drone, in meters, $t$ seconds after it leaves the ground. Which statement describes the point $f(2)=4$?

1. The height of the drone after 4 seconds is 2 meters off the ground.
2. The height of the drone after 2 seconds is 4 meters off the ground.