Mathematics 7

What is a mathematical comparison between two numbers? 

• proportion 

• decimals

• ratio     

• fraction

The cost of a boat fare varies directly as the distance traveled. When the distance is 70 km, the cost is $40. Find the cost when the distance is 95 km. What type of proportion is this? 

• increasing

• decreasing 

• inverse proportion

• direct proportion

What is the set containing all objects or elements and of which all other sets are subsets? 

• Well-defined set

• Subset

• Universal set   

• Null set  

The union of the sets {1, 2, 5} and {1, 2, 6} is the set _______________

• {1, 2, 6, 1}

• {1, 2, 5, 6} 

• {1, 2, 1, 2}

• 4. {1, 5, 6, 3}   

The set O of odd positive integers less than 10 can be expressed by _____________.    

•  {1, 2, 3}

• {1, 3, 5, 7, 9}

• {1, 2, 5, 9}

•  {1, 5, 7, 9, 11}

In a group of 50 students, 38 play chess and 24 play scrabble. How many plays both chess and scrabble? 

You are baking cookies, and the time it takes to bake a batch of cookies is inversely proportional to the number of cookies you bake. If it takes 15 minutes to bake a batch of 24 cookies, how long will it take to bake a batch of 36 cookies? 

18. You are baking cookies, and the time it takes to bake a batch of cookies is inversely proportional to the number of cookies you bake. If it takes 15 minutes to bake a batch of 24 cookies, how long will it take to bake a batch of 36 cookies? 

 

Give an example of a direct proportion problem or situation. 

List the sets of A,B,C and universal set in roaster form.