constant of proportionality

The table shows the amount of time Abigail works and the amount of money she earns. What is the missing value in the table?

The constant of proportionality in the equation y = 4x is _____

A dolphin travels through the water at a speed of 25 kilometers per hour. Select two representations that show the distance a dolphin can travel at this rate.

• 
• y = x + 25

• 
• In 5 hours the dolphin can travel 125 kilometers.

Four customers at a gas station this morning each purchased the same type of gasoline. The table shows the amounts of gasoline they purchased and the costs.

Using the data in the table above, how much does 1 gallon of gas cost?

• $3.50

• $4.00

• $4.50

• $5.00

Determine the missing value in the table.

• 15
• 3
• 1/3
• 9

What is the constant of proportionality?

• $3
• $4
• $2
• $9

Identify the constant of proportionality.

• k = 25

• k = 50

• k = 100

• k = 1/50

• none (not proportional)

Ten soccer players were going to a soccer tournament with their three coaches. What is the ratio of coaches to players? 

• 10 : 3
• 10:13
• 3 : 10
• 3:13

To disinfect 1 quart of stream water to make it drinkable, you need to add 2 tablets of iodine. How many tablets do you need to disinfect 4 quarts?

• 4 tablets

• 5 tablets

• 6 tablets

• 8 tablets

Write the equation for the table given.

• y = 16/2x
• y=8x
• y=12x