Melissa and Brian are at the base of a mountain, Melissa hikes to a location 27 meters above sea level. Brian hikes to a
location 21 meters below sea level.
a. Write an integer to represent each hiker's location with respect
to sea level.
b. What is the difference of the hikers' altitudes?
c. Can the integers be subtracted in either order to find the difference? Explain.

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?

Me with this one question, and i'll upvote the brainliest answer

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2