Answer:
a) 
b) 12.72 units
Step-by-step explanation:
Recall that the sine and cosine are completed functions.
This means that: 


Recall that: sine ratio is opposite/hypotenuse

This implies that:



We may draw a vertical that bisects the vertex angle and the shorter side of the triangle, to form a right-triangle with the measurements:
hypotenuse = 8
length = 1.5
We may then apply:
sin(∅) = P / H
sin(∅) = 1.5 / 8
∅ = 10.8 ≈ 11°
This is half of the vertex angle, so the vertex angle is:
11 * 2 = 22°
Answer:
D. 1,211
Step-by-step explanation:
857 + 354 = 1,211 runners
Putting this into expression form, it would be:
12 ÷ (h + 2)
Hope this helps!
7.4 rounded to the nearest tenth is 7