Which surface represents a plane in hyperbolic geometry

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

How many lines can be drawn through points j and k? 0 1 2 3