What is the zero of function f?
f(x)=7^3Vx+12-12

I'm so close to finishing all these.

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?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?