What two pieces of information would you need in order to measure the masses of stars in an eclipsing binary system?

Which action is good business etiquette? a. switching your cell phone off before you enter a meeting b. keeping your cell phone on low volume before you enter a meeting c. setting a pleasant ring tone on your cell phone before you enter a meeting d. setting a standard ringtone on your cell phone before you enter a meeting

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What is the function of compilers and interpreters? how does a compiler differ from an interpreter?