Algebraic Expressions,Direct & Inverse Proportion Class 8

If x,y and z are variables, then x+y+z is a

Product of - $$\left(x^2+3x+5\right)\ and\ \left(x^2-1\right)$$  

Identity for $$\left(a^2-b^2\right)$$  (More than 1 correct answer)

An algebraic expression that has only one term (Type answer in all small letters)

(a)  

A symbol which takes various numerical values is called a constant

Which of the following is in Direct Proportion ?

15 books weigh 6 kg. What will 6 books weigh ?

Question 21.If 8 men can do a piece of work in 20 days, in how many days could 20 men do the same work ?

The constant of variation, if x ∝ y, from the following table is

If x = 20 and y = 40, then x and y are: