What is the class midpoint for the third class?

Steve is scuba diving near his home in maui. at one point he is 100 feet below the surface. represent this number with a negative number. if he descends another 5 feet, what negative number will represents his.

For what value of x does 4x = (1/8) x + 5?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?