Answer:
Each package of pen costs 2.5
Each package of marker costs 5
Step-by-step explanation:
Please refer to the attached image for explanations
Answer:
if a = b and b= c then a,b and c are all equal
Answer: x=0
Step-by-step explanation:

The answer is 7.14%
Your ruler measuring centimeters has lines for each centimeter. The rule for error is anything between 6.5 and 7.5 is considered 7cm. So the degree of error is plus or minus .5cm.
Your aim is 7cm so you divide your error of .5 by your target measurement. .5/7= 7.14 percent.