Answer:
Step-by-step explanation:
4. 2b-6+3b=
5b-6=143
5b=143+6
5b=149
b=149
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5
1. C
2. A
3. B
Hope This Helped!
<u><em>(Brainliest will be appreciated)</em></u>
Sin (a+b) = sin a. cos b + cos a. sin b
a= 50° and b=40°, then
sin(50+40) = sin 50° . cos 40° + cos 50° . sin 40°
sin(50+40) = sin 90° = 1 and
sin 50° . cos 40° + cos 50° . sin 40° = 1
The answer I got was 417/50 hope this helps you