Answer:
concrete operational stage
Step-by-step explanation:
Have a look at the attached photo below, it may be your full question:
The concrete operational stage is the third phase in Piaget's cognitive development theory. This period spans the period between childhood, it begins around 7 years of age and continues until about 11 years of age and is characterized by the development of logical thinking.
10√3 (-7 - √5)
10√3 × -7 + 10√3 × -√5
-70√3 + 10√3 × -√5
-70√3 - 10√3√5
-70√3 -10√3 × 5
-70√3 - 10√15
hope that helps, God bless!
Answer:
⅜
Step-by-step explanation:
30/80
= 3/8