We have,

Introduce variable
such that 
The sum
is therefore 
So,
(sadia's age)
(father's age)
Hope this helps :)
Answer:
B
Step-by-step explanation:
Answer:
=10
Step-by-step explanation:
5x-4x². (x=2)
5(2)-4(2)²
=10-0
=<em>1</em><em>0</em>
Answer:

Step-by-step explanation:
It's easy you are
kid♂️♂️♂️
Answer:
n = 179
Step-by-step explanation:
See it in the pic