Can you ever use a calculator to determine if a number is rational or irrational? explain.

Irrational cannot be represented as a fraction. so your answer is yes.

I would say no' as calculators were designed to give us approximate answers when dealing with irrational numbers.
It would be hard to guess whether a large number produced by a calculator is irrational or not given that fact that many rational numbers can be incredibly long.

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*