Answer:
12
Step-by-step explanation:
Average age of 5 boys = 11 year
Sum of age of 5 boys = 11*5 = 55
Age of sixth boy = 17 years
Sum of age of 6 boys = 55 + 17 = 72
Average age of 6 boys= 72/6 = 12
Answer:
They are not co-linear.
Step-by-step explanation:
For three point's to be co linear the slopes of the lines connecting them should be same
Mathematically we can write for 
to be co-linear we should have

Applying the given values we obtain

As we can see the values are not equal thus the points are not co-linear.
Answer:
10x
Step-by-step explanation:
<h3>Expression:</h3>
Length = x unit
Width = 4*x = 4x
Perimeter = 2*(length + width )
= 2*(x + 4x)
= 2 *5x
= 10x
-2 is -2mnp's coefficient