What’s the process for solving this?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

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

Zack notices that segment nm and segment pq are congruent in the image below: which step could him determine if δnmo ≅δpqr by sas? (5 points) segment mo ≅ segment qr segment on ≅ segment qp ∠ n ≅ ∠ r ∠ o ≅ ∠ q