Its in the tens place so the unit value is 30
Answer:

Step-by-step explanation:
by using well known formula, distance on XOY plane

Answer:
28.5 cm²
Step-by-step explanation:
There are 7 whole diamonds and 5 half-diamonds. Each diamond is worth three.
7x3=21
5/2x3=7.5
21+7.5=28.5
Area of a square is side length^2
Area = 15^ 2 = 15 x 15 = 225 square inches.