Answer:
<h2>It's a right triangle. a = 5.</h2>
Step-by-step explanation:
Look at the picture.
We have the triangle 30° - 60° - 90°. The sides are in ratio 1 : √3 : 2.
We have:
<em>divide both sides by √3</em>

It's a right triangle.
Hope you can understand the handwriting :)
Answer:
42 liters= 42000 milliliters
Black = 15
blue= 6
15 + 6 = 21
30-21 = 9
white t shirts = 9