What is the difference between dependent variable independent variable vs response variable explanatory variable?

Step-by-step explanation:

we are to distinguish between

dependent variable independent variable

vs

response variable explanatory variable

An independent variable is one which is not affected by any other variable for example, the amount we spend, the time we study ,etc.  

An explanatory variable is a type of independent variable but not fully independent but depends on some factors.

Though explanatory and independent variables are practically used interchangeably the main difference is explanatory variable is not independent but explains the variations in the response varaible.

180 pages

Step-by-step explanation:

Data: Read half the book last week = 1/2 30 pages missing Read a third of the book this week = 1/3 If 1/6 equals 30 pages , then 1 (represents the total for the book) equals: 1/6 → 30 The fraction that is missing is found: 1 -5/6 = 1/6 Therefore, the book has 180 pages