Variable Relationships and Expressions

Mr. Holcomb presents lesson 18 on writing and evaluating expressions, focusing on addition and subtraction. The lesson begins with an exercise on increasing a number by two, using variables and diagrams. Emphasis is placed on the importance of specificity in naming variables and including units of measure. The lesson includes examples of improving variable descriptions and writing expressions for various scenarios. The video concludes with a summary of key points.

What is the result of increasing a variable 'a' by 2?

• 2a

• a + 2

• a / 2

• a - 2

Why is it important to include units of measure when naming variables?

• To make the variable look complex

• To avoid losing points in exams

• To confuse the reader

• To make calculations easier

If 'J' represents Joshua's speed, how should it be described?

• J represents Joshua's speed in miles

• J represents Joshua's speed in hours

• J represents Joshua's speed in meters per second

• J represents Joshua's speed in kilometers

How would you express Greg having two more dollars than Jeff?

• J / 2

• 2J

• J + 2

• J - 2

If Abby read 8 more books than Kristen, and Kristen read 9 books, how many did Abby read?

• 19

• 18

• 17

• 15

Daryl has been teaching for one year longer than Julie. If Julie has been teaching for 28 years, how long has Daryl been teaching?

• 27 years

• 28 years

• 29 years

• 30 years

Ian scored 3 fewer goals than Julia. If Julia scored 11 goals, how many did Ian score?

• 8

• 10

• 11

• 9

Johan visited Niagara Falls 3 times fewer than Arthur. If Arthur visited 5 times, how many times did Johan visit?

• 1

• 2

• 3

• 4

What is the expression for Abby reading 6 more books than Kristen in the second marking period?

• K - 6

• K / 6

• 6K

• K + 6

If 'F' represents the number of times Arthur visited Niagara Falls, how would you express Johan's visits?

• 3F

• F - 3

• F + 3

• F / 3