Which are polynomials

Given:

Given that there are 4 expressions.

We need to determine the expressions that are polynomials.

Option a:

In the second term of the expression, the constant is divided by a variable.

For an expression to be a polynomial, it should not divided by a variable.

Hence, the expression is not a polynomial.

Thus, Option a is not the correct answer.

Option b:

The given expression satisfies the conditions of the polynomial.

Hence, the expression is a polynomial.

Thus, Option b is the correct answer.

Option c:

The given expression satisfies the conditions of the polynomial.

Hence, the expression is a polynomial.

Thus, Option c is the correct answer.

Option d:

The second term of the expression contains the exponent

For an expression to be a polynomial, the fractional exponent is not allowed.

Hence, the given expression is not a polynomial.

Thus, Option d is not the correct answer.

people went from manufacturing one object at a time by hand to manufacturing many objects in factories

i dont know sorry

step-by-step explanation: