1. -5^3-4^3
2. -15-64
3. -79
So, the right option is 1. so if my ans was helpful u can follow me.
Answer:

Step-by-step explanation:
refer to solution in the picture
Given that,
Shelley's pet food store sold one customer 5 peanut butter biscuits for $3. She sold another customer 7 beef treats for $4.20.
For peanut, the cost is ratio is

For beef, the ratio is

If we take cross product of these items,

It implies, that the sale is in true proportion. From the cross product, we find that it is equal.