Question
The number of pounds of dog food that a pet store has is represented by the equation y = negative 15 x + 430, where x represents the number of days that the store is open and y represents the pounds of dog food in stock in the store. How many pounds of dog food will the pet store have after 21 days?
92
115
315
336
92
115
315
336
Answers
GPT-4o mini
To find the number of pounds of dog food the pet store will have after 21 days, we can substitute \( x = 21 \) into the equation \( y = -15x + 430 \).
Substituting \( x \):
\[
y = -15(21) + 430
\]
Calculating \( -15 \times 21 \):
\[
-15 \times 21 = -315
\]
Now, substituting this value back into the equation:
\[
y = -315 + 430
\]
Calculating \( -315 + 430 \):
\[
y = 115
\]
Thus, the pet store will have **115 pounds** of dog food after 21 days. The correct answer is **115**.
Substituting \( x \):
\[
y = -15(21) + 430
\]
Calculating \( -15 \times 21 \):
\[
-15 \times 21 = -315
\]
Now, substituting this value back into the equation:
\[
y = -315 + 430
\]
Calculating \( -315 + 430 \):
\[
y = 115
\]
Thus, the pet store will have **115 pounds** of dog food after 21 days. The correct answer is **115**.