HELP PLEASE!!
Which of the following equations is true to find the length BC?

BC/sin 23 = 10/sin 47

Step-by-step explanation:

Here, we want to select the true equation to find the length BC

From the question, we have the angle facing side BC; also, we have the angle and the side facing it for another side

In this situation, the best way to solve for BC is by the use of the sine rule

The sine rule states that the ratio of the length of a side and the sine of the angle facing the side is constant for a given triangle

Thus, we have it that;

BC/sin 23 = 10/sin 47

356 + 365 + x = 977   where x is the number of students in the third grade.

to find x  subtract 356 and 365 from 977

x = 977-356-365 = 256