Answer:

• subtract eqn(b) from eqn(a);

• find x :

Answer:
(-2,1),(-1,2),(-3,5/3)
Step-by-step explanation:
The answer will be 40. As it doubles twice during 220mins- 10 to 20 and then 20 to 40.
Answer:
There are no real roots for this equation.
Step-by-step explanation:
The only solution is irrational: x-√(4-8x)=0
I have provided a graph to help you with this problem.
Hope this helps! :)