Since the numbers on the x-axis represent the number of years that have passed since 2000, you must subtract 2000 from the given year to get the correct x-value. Substitute this x-value into the equation of the trend line and simplify.

What is the diagram u didn't post that

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.