Answer:
true
Step-by-step explanation:
1/2 (sin(x+y)+sin(x-y))
= 1/2 (sin x cos Y + cos x sin y + sin x cos y - cos x sin y)
= 1/2 * 2 sin x cos y
= sin x cos y
The expression is true.
Since you mentioned the fundamental counting principle, I assume you are looking for the total number of possibilities.
If you are picking a month, there are 12 options.
If you are selecting a day of the week, there are 7 options.
If you are doing both, you multiply the two numbers together.
12 x 7 = 84
6. 300
7. 20
9. 300
10. 800
12. 800
13. 700
15. 700
16. 700
.
Answer:
50 miles per hour!
Step-by-step explanation:
If 2 hours equal 100 miles, then 1 hour will be 50!
Hope this helped!