Why are the reactions listed in column a classified as chemical reactions?

i think it is D.

Step-by-step explanation:

because If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same. I hope this helps!

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation: