Help please, thanks so much

How do i multiply two digit numbers

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

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.