Real numbers class 10

Determine all pairs (a,b) of real numbers such that 10, a,b,ab are in arithmetic progression .

Given that x,y and b real are real numbers and x ge y , b gt 0 , then

If z=1+it h e nz^(10) reduces to: A purely imaginary number An imaginary number A purely real number A complex number

Irrational numbers are real numbers also.

The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. The upper class limit of the highest class is

In a frequency distribution, the mid values of a class is 10 and width of the class is 6 . The lower limit of the class is

Prove that the identity function on real numbers given by f(x) = x is continuous at every real number.

Write the negation of the following compound statement: All rational numbers are real and all real numbers are complex.

Find the component statements of the following compound statement: All rational numbers are real and all real numbers are complex.

If a,b,c are positive real numbers, then the number of real roots of the equation ax^2+b|x|+c is