Comparing Constants of Proportionality in 7th Grade Math

The video tutorial explains how to calculate the total price for cupcakes using the equation d = 2c, where d is the total price in dollars and c is the number of cupcakes. It clarifies that each cupcake costs two dollars. The tutorial then shifts to comparing ice cream prices per scoop across three stores, using equations and a graph to determine that Store A offers the least expensive option at 75 cents per scoop, followed by Store B at one dollar per scoop, and Store C at $1.50 per scoop.

What does the '2' represent in the equation D = 2C used by Betty's Bakery?

• The cost per cupcake in dollars

• The cost of two cupcakes

• The bakery's operating hours

• The number of cupcakes available

If you buy 5 cupcakes from Betty's Bakery, how much will it cost?

• $5

• $20

• $15

• $10

How many types of cupcakes does Betty's Bakery sell according to the video?

• One type, priced differently

• Two types, but price is not discussed

• The video does not specify

• Multiple types with different prices

Which store offers the cheapest ice cream per scoop?

• Store C

• Store B

• Store A

• All are the same

How much does one scoop of ice cream cost at Store B?

• $0.75

• $1.00

• $2.00

• $1.50

If you buy 4 scoops of ice cream from Store C, how much will it cost?

• $3

• $4

• $6

• $8

What equation does Store A use to calculate the price of ice cream?

• D = 2S

• D = 1.5S

• D = 0.75S

• D = S

At Store C, what is the cost per scoop of ice cream?

• $2.00

• $1.50

• $1.00

• $0.75

What is the relationship between scoops and dollars at Store B?

• Not mentioned

• Constant, regardless of scoops

• Inversely proportional

• Directly proportional

Which store is the most expensive for ice cream per scoop?

• Store A

• Store B

• They are equally expensive

• Store C