Mathematical Concepts in Real-Life Scenarios

This video tutorial covers Math 7 Unit 5 Lesson 7, focusing on adding and subtracting to solve problems. It explores solving equations with positive and negative numbers, managing inventory changes, calculating electricity usage with solar panels, and understanding differences and distances on a coordinate grid. The session concludes with homework and practical applications of the concepts discussed.

What is the sign of the solution to the equation -2.7 + x = 3.5?

• Cannot be determined

• Zero

• Negative

• Positive

If a store's inventory changes from 18 to 16, what does this indicate?

• Inventory doubled

• Inventory remained the same

• Two phones were added

• Two phones were sold

What does a positive change in inventory signify?

• A shipment was received

• A sale was made

• Inventory was unchanged

• Inventory was lost

How is the amount due calculated when using solar power credits?

• By adding the credit to the usage

• By subtracting the credit from the usage

• By dividing the credit by the usage

• By multiplying the credit by the usage

In a coordinate grid, what is always true about distances?

• They can be either positive or negative

• They are always zero

• They are always positive

• They can be negative

What shape is formed by connecting the points A(5,4), B(5,-2), C(-3,-2), and D(-3,4)?

• Circle

• Triangle

• Rectangle

• Square

How do you calculate the sales tax on a $15 meal with a 6.6% tax rate?

• Multiply $15 by 0.066

• Multiply $15 by 6.6

• Subtract 6.6 from $15

• Add $15 to 6.6

If a meal costs $15 and the sales tax is $0.99, what is the total cost before tip?

• $15.00

• $15.99

• $14.01

• $16.99

What is the change in elevation from 8500 to 3400?

• 4900

• 5100

• -5100

• -4900

How much rain is needed in August to meet the average rainfall of 3.74 inches?

• 2.43 inches

• 1.31 inches

• 0.31 inches

• 3.74 inches