Question

(02.04 mc)
your friend has $90 when he goes to the fair. he spends $5 to enter the fair and $15 on food. rides at the fair cost $1.50 per ride. which function can be used to determine how much money he has left over after x rides?

o a
f(x)=1.5x + 70

o b
f(x)=-1.5x + 70

o c
f(x)=-1.5x - 70

o d
f(x)=-20x + 90

Explanation:

Step1: Calculate total initial - spending

He spends $5 to enter and $15 on food, so the total non - ride spending is $5 + 15=20$. He started with $90, so the remaining money before rides is $90 - 20 = 70$.

Step2: Determine the cost of rides

Each ride costs $1.50. After $x$ rides, the total cost of rides is $1.5x$.

Step3: Find the remaining money function

The money left over $f(x)$ is the money remaining before rides minus the cost of rides. So $f(x)=70 - 1.5x=-1.5x + 70$.

Answer:

B. $f(x)=-1.5x + 70$