You can compare irrational numbers using rational approximation, yes or no?

Apossible wavelength for the color blue is 0.000000492 meter. which of the following is a reasonable estimate for this wavelength for the color blue? a. 5 × 10-6 m b. 5 × 107 m c. 5 × 10-7 m d. 5 × 106 m

Which digit in 2,375,699 has a value that is 10 times greater the value of the first digit to its right? a.6 b.7 c.3 d.5

Use the diagram of triangle xyz to answer the questions. what is the length of side xy? what is the value of sin(x)? what is the value of cos(x)? what is the value of tan(x)?