What is HCF and LCM? # confused

The range for a list of measurements equals the greatest measurement minus the least measurement. The two lists of measurements, X and Y, combined consist of 30 measurements with a range of 25. What is the range for the measurements in list X?

Find the LCM of 308 and 420.

Micah and Lucy are in the school play. Micah memorizes 12 lines of the script the first day and 10 lines each day after that. Lucy memorizes 8 lines of the script the first day and 12 lines each day after that.

Logan County is a square. It has a side that is 15.4 miles long. What is its area?

Drew is finding the base of a triangle that is 20 m in height and it's area is 100 meters squared he says the base is 5 meters is he correct why or why not

Sarah too advertising department from her company on a round trip to meet with a potential client. Including Sarah a total of 8 people took the trip. She was able to purchase coach tickets for $210 and first class tickets for $1100.

Mindy spent $21 on a dress shirt. the cost of the dress shirt was $2 more than half the cost of a pair of slacks that she bought. determine the cost of the slacks. which answer choice shows the correct equation and solution for the situation?

Mike saves $42 a week for 7 weeks. During his 8-day vacation, he plans to spend $8.25 each day for snacks. Which expression shows how much money he will have left? (42 : 7) - (8 • 8.25) (42 • 7) - (8 • 8.25) (42 • 7) + (8 • 8.25) 42 • 7 • 8 • 8.25

A drinking glass contains 300 ml of juice. How much juice a dozen glasses holds?

Which algebraic expression represents "the class was divided into 6 equal groups"?