Answer:
Step-by-step explanation:
Cost of a t-shirt = 150 grams
Cost of 20 t-shirts = 150*20
= 3000 gram { 1000 g = 1 Kg}
= 3000/1000 = 3 kilogram
Use the pythagorean theorem:

where c is the hypotenuse of the triangle.
Answer:
Lemniscate.
Step-by-step explanation:
It is called a lemniscate. A bit like the sign for infinity (∞) . Symmetrical about the x and y axes.
I believe it's 16. I hope that helps