What’s the common difference or ratio for the sequence 5,10,15,20,25,30,35

Me what is the value of x? showing work would be appreciated - ! : )

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

How can constraints be used to model a real-world situation?