The chromatography is the technique of separation of the components from a mixture. The chromatograph is referred to a visible record of the result of the chromatography.
The mobile phase is referred to the gas or the liquid which flows with a different rate on the stationary phase. The mobile phase carries the components of the mixture. It is important for the separation of the components present in the mixture.
Answer:
4x + 6y = 420
Explanation:
since x is number of child tickets and y is adult tickets, and $4 is the cost of child tickets and $6 is the cost of adult tickets, that eliminates A and D.
The question also states "for one day", so that elimates C, which C is the equation for two days.
This leaves 4x + 6y = 420
