Please help me!! 8th grade math, Pythagorean Theorem

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

During your cycling trip, you and your friends often stayed in hostels. the prices of these are listed below. hostel standard room (price per night) with breakfast (price per night) super sleep hostels £22.45 £28.65 normandy nights £18.55 £25 zzzola hostels £24.50 £30.99 belgian beds £11.20 £18.55 night-time rest days ? £33 what is the range in cost for a single night, including both standard room prices and with breakfast prices?

Solve the equation by completing the square. x^2+2x=17