Understanding Proportions and Cross Products

What is the main focus of today's lesson?

• Learning about geometry

• Exploring calculus

• Understanding the concept of proportions

• Solving equations using algebra

According to the property of proportions, what must be true for the cross products?

• They must be different

• They must be greater than one

• They must be equal

• They must be zero

In a proportion a/b = c/d, which of the following is a valid cross product equation?

• a + d = c + b

• a * d = c * b

• a - d = c - b

• a / d = c / b

What is the result of solving the proportion 15c = 36 * 9?

• c = 21.6

• c = 24

• c = 18

• c = 30

In the example of the architect's model, what is the actual width of the building if the model is 20 inches wide?

• 60 feet

• 40 feet

• 55 feet

• 50 feet

When setting up a proportion for the architect's model, what is the correct setup for tall over wide?

• Model height over actual width

• Actual height over model width

• Model width over actual height

• Model height over model width

How many calories are in one cracker if a serving of four crackers contains 70 calories?

• 15 calories

• 17.5 calories

• 25 calories

• 20 calories

What is the constant of proportionality in the calorie example?

• 17.5

• 15

• 20

• 25

How many calories are in seven crackers based on the constant of proportionality?

• 122.5 calories

• 140 calories

• 100 calories

• 150 calories

What is the equation used to calculate the total calories in the cracker example?

• Calories = 20 * number of crackers

• Calories = 15 * number of crackers

• Calories = 25 * number of crackers

• Calories = 17.5 * number of crackers