Would the wave speed up or down

If one wants to make a prediction about the contents of a particular section of a text while reading, it would be best to use. !

Wich of the following is true about social classes. a.they are mainly based on gender.b.people in most society's cannot improve their status.c.they are mainly based on age.d.they can improve their satus by getting a good education.

Which of the following describes how children use grouping in the early childhood setting? a. matching objects based on a common characteristic such as size, shape, or color b. basic ordering of numbers and identification by written number c. spatial relationships and concepts of proximity, separation, enclosure or surrounding, and continuity d. basic operations of numbers including addition, subtraction, multiplication, and division