How many significant figures does 097.83 have?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

If i have 20$ and i gave 5$ away how much i got

Neoli is a nurse who works each day from 8: 00 am to 4: 00 pm at the blood collection centre. she takes 45 minutes for her lunch break. on average, it takes neoli 15 minutes to collect each sample and record the patient's details. on average, how many patients can neoli see each day?