Answer:

Step-by-step explanation:
Remove parenthesis: (a) = a



Simplify 

Regards,
Mordancy
36/15 = 8/a
multiply a .. on both sides
a×36/15= 8
multiply 36/15 reciprical on both sides
a= 8 × 15/36
a= 120/36
a= 3.33
Answer:
[0,∞), {y|y≥0}
Step-by-step explanation:
12 is the 15% of 80
80 x 0.15 = 12
Answer:
14.93°
Step-by-step explanation:
Using trigonometry :
From the diagram attached :
Angle of elevation = x
To obtain the value of x
Tan x = opposite / Adjacent
Tan x = 8 / 30
Tan x = 0.266666
x = tan^-1(0.26666)
x = 14.93°
Therefore, the angle of elevation is 14.93°