What makes values of a and b make each inequality true? -ab> 0, ab< 0, a^2b> 0, a/b> 0

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

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )