Help please I will give if it is right

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points