Answer:30+15
Step-by-step explanation:
Answer: x = 20.
Step-by-step explanation:
x and (3x + 10) combine to form a right angle, shown in the diagram by the small square joining the perpendicular lines.
Right angles are 90 degrees, so you can add both angles to get 90:

Answer:
The surface area of ball is 400π sq.cm
There will be 100 hand shakes because you would do 10x10 which is 100