A tub filled with 50 quarts of water empties at a rate of 2.5 quarts per minute. Let [tex]$w=$[/tex] quarts of water left in the tub and [tex]$t=$[/tex] time in minutes.

\begin{tabular}{|c|c|}
\hline
Time [tex]$(t)$[/tex] & Quarts of water [tex]$(w)$[/tex] \\
\hline
0 & 50 \\
\hline
2 & 45 \\
\hline
4 & 40 \\
\hline
\end{tabular}

Choose the correct answers.

1. Which equation models the relationship?

[tex]$\square$[/tex]

2. Is there a viable solution when time is 30 minutes?

[tex]$\square$[/tex]



Answer :

To approach this problem, let’s start by understanding how the volume of water in the tub changes over time.

1. Given Information:
- The tub is initially filled with 50 quarts of water.
- The water empties at a rate of 2.5 quarts per minute.

2. Establish the Relationship:
- Let [tex]\( w \)[/tex] be the amount of water (in quarts) left in the tub.
- Let [tex]\( t \)[/tex] be the time (in minutes) since the tub started to empty.

3. Formulate the Equation:
To model this relationship mathematically, we can express [tex]\( w \)[/tex] as a function of [tex]\( t \)[/tex]:
[tex]\[ w(t) = \text{initial amount} - (\text{emptying rate} \times \text{time}) \][/tex]
Given the initial amount of water is 50 quarts and the rate of emptying is 2.5 quarts per minute, the equation becomes:
[tex]\[ w(t) = 50 - 2.5t \][/tex]

4. Validation Using Provided Data:
Let’s validate the equation with the values in the table:
- At [tex]\( t = 0 \)[/tex]:
[tex]\[ w(0) = 50 - 2.5(0) = 50 \, (\text{matches the table}) \][/tex]
- At [tex]\( t = 2 \)[/tex]:
[tex]\[ w(2) = 50 - 2.5(2) = 50 - 5 = 45 \, (\text{matches the table}) \][/tex]
- At [tex]\( t = 4 \)[/tex]:
[tex]\[ w(4) = 50 - 2.5(4) = 50 - 10 = 40 \, (\text{matches the table}) \][/tex]

So, the equation [tex]\( w(t) = 50 - 2.5t \)[/tex] correctly models the relationship.

5. Check the Viable Solution for [tex]\( t = 30 \)[/tex] minutes:
Let’s determine the amount of water left in the tub at [tex]\( t = 30 \)[/tex]:
[tex]\[ w(30) = 50 - 2.5 \times 30 \][/tex]
[tex]\[ w(30) = 50 - 75 = -25 \][/tex]

Therefore, after 30 minutes, the calculation gives us [tex]\(-25\)[/tex] quarts of water left in the tub, which is not possible physically (since negative water amount doesn’t make sense). Hence:

6. Conclusion:
- The correct equation is [tex]\( w(t) = 50 - 2.5t \)[/tex].
- There is not a viable solution when [tex]\( t = 30 \)[/tex] minutes because it results in a negative amount of water, which is not possible in real life.

Thus, the answers are:
1. The equation that models the relationship is [tex]\( w(t) = 50 - 2.5t \)[/tex].
2. There is no viable solution when time is 30 minutes.