Answer:
6.9
Step-by-step explanation:
Cos ∆ = Adjacent/Hypotenuse
therefore x=12Cos55°
=6.88
=6.9 to the nearest tenth
1) B and C
2) 0 < 5x - 10 < 50
10 < 5x < 60
2 < x < 12
3) B
17.4076456756
just remove the parentheses and add the numbers
-
-pi/2