Plzz ill make your answer the brainiest answer

10: P∪R\O,     b) an example could be 9.(8)     11)x= 1/3, y=-2

Step-by-step explanation:

basically means the union of P and R without the part that O overlaps

so the intersection, or the same in both of A and B. Also irrational means not able to write as a simple fraction, so things like 9.(8) ( the parenthesis means continuously, so like 9.8888888888888888888888888888 and so on) and this number also has to be between 9 and 10 so numbers like this(9.(8))

the second equation can be simplified to 3x-y=3, or 3x-3= y. so we plug this into the first equation to get 9x +4(3x-3)=-5. simplify and you get 9x+12x-12=-5, 21x=7, x= 1/3. now we plug this equation into one of them, such as the second one to get  6(1/3)-2y=6. simplify to get 4= -2y, y=-2

and sorry i didn't get what you meant by the other one at first

decrease

Explanation:

I want us to cast our minds back to the idea of concentration. Recall that concentration refers to the amount of solute in a solution.

The concentration of a solution decreases as the volume of water added to the solution increases.

Now, if we look at the table, we will notice that the mass of calcium carbonate is constant while the concentration of the hydrochloric acid in water varies. The volume of the acid is decreasing while the volume of water increases. This indicates that the acid is becoming more dilute (concentration decreases steadily).

As the concentration of acid decreases, less carbon dioxide is evolved. This is so because the rate of reaction (shown by the volume of CO2 gas evolved is dependent on the concentration of reactants. As reactant concentration decreases, the rate of reaction decreases accordingly). As such, the last column decreases steadily.