Question
A car uses 1 gallon of gasoline for every 25 miles driven. At the start of a trip the tank was full of gasoline. After driving 500 miles, there were 2 gallons of gasoline left in the tank.
Which equation shows the amount of gasoline left in the tank, V, as a function of the number of miles driven, d?
Answer options with 5 options
A.
V equals StartFraction d over 25 EndFraction
B.
V equals negative StartFraction d over 25 EndFraction plus 2
C.
V equals StartFraction d over 25 EndFraction plus 22
D.
V equals negative StartFraction d over 25 EndFraction plus 22
E.
V equals StartFraction d over 25 EndFraction plus 2
Which equation shows the amount of gasoline left in the tank, V, as a function of the number of miles driven, d?
Answer options with 5 options
A.
V equals StartFraction d over 25 EndFraction
B.
V equals negative StartFraction d over 25 EndFraction plus 2
C.
V equals StartFraction d over 25 EndFraction plus 22
D.
V equals negative StartFraction d over 25 EndFraction plus 22
E.
V equals StartFraction d over 25 EndFraction plus 2
Answers
GPT-4o mini
To determine the correct equation that represents the amount of gasoline left in the tank, \( V \), as a function of the number of miles driven, \( d \), we'll start by analyzing the provided information.
1. The car uses **1 gallon** of gasoline for every **25 miles** driven. Therefore, for **500 miles**, the amount of gasoline used is:
\[
\text{Gasoline used} = \frac{500 \text{ miles}}{25 \text{ miles/gallon}} = 20 \text{ gallons}
\]
2. After driving 500 miles, there are **2 gallons** of gasoline left in the tank. So, at the start of the trip, the tank was full and contained:
\[
\text{Starting gasoline} = \text{gasoline used} + \text{gasoline left} = 20 \text{ gallons} + 2 \text{ gallons} = 22 \text{ gallons}
\]
Now, we establish the relationship between the number of miles driven \( d \) and the amount of gasoline left \( V \). Since the car uses \( \frac{d}{25} \) gallons for \( d \) miles, the gasoline left can be calculated as follows:
\[
V = \text{Starting gasoline} - \text{Gasoline used}
\]
Substituting in the values gives:
\[
V = 22 - \frac{d}{25}
\]
This can be rearranged to:
\[
V = -\frac{d}{25} + 22
\]
Thus, the correct option from the provided choices is:
**D. \( V = -\frac{d}{25} + 22 \)**
1. The car uses **1 gallon** of gasoline for every **25 miles** driven. Therefore, for **500 miles**, the amount of gasoline used is:
\[
\text{Gasoline used} = \frac{500 \text{ miles}}{25 \text{ miles/gallon}} = 20 \text{ gallons}
\]
2. After driving 500 miles, there are **2 gallons** of gasoline left in the tank. So, at the start of the trip, the tank was full and contained:
\[
\text{Starting gasoline} = \text{gasoline used} + \text{gasoline left} = 20 \text{ gallons} + 2 \text{ gallons} = 22 \text{ gallons}
\]
Now, we establish the relationship between the number of miles driven \( d \) and the amount of gasoline left \( V \). Since the car uses \( \frac{d}{25} \) gallons for \( d \) miles, the gasoline left can be calculated as follows:
\[
V = \text{Starting gasoline} - \text{Gasoline used}
\]
Substituting in the values gives:
\[
V = 22 - \frac{d}{25}
\]
This can be rearranged to:
\[
V = -\frac{d}{25} + 22
\]
Thus, the correct option from the provided choices is:
**D. \( V = -\frac{d}{25} + 22 \)**
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