To round to the nearest ten thousand, look at the number in that place. This number is 8. Now look at the number after it. It is less than five so keep the number as it is. This number rounded would be 780,000.
Answer :option C: tan C
From the attached diagram
AB = 3
AC = 2
We consider each option and check
A: Sin B = Opposite / hypotenuse = 2/ 3.61
B : tan B = opposite / adjacent = 2/3
C: tan c= opposite / adjacent = 3/2
D: Sin C = opposite / hypotenuse = 3/ 3.61
tan c= 3/2 that has the ratio equals 3/2
Your middle finger and index/pointer.