If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D?

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21}

{3, 6, 9, 12, 15, 18, 21}

{3, 6, 9}

{ }
Which of the following is a subset of the set
A: {female children between the ages of 6 and 10}

{a 7 year old child}

{children between the ages of 6 and 8}

{female children 8 years of age}

{female children under 6 years old}

Question

If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D? 

 {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21} 

 {3, 6, 9, 12, 15, 18, 21} 

 {3, 6, 9} 

 { } 
Which of the following is a subset of the set
A: {female children between the ages of 6 and 10} 

 {a 7 year old child} 

 {children between the ages of 6 and 8} 

 {female children 8 years of age} 

 {female children under 6 years old}

anonymous · Answer

The first answer is the first answer choice

anonymous · Answer

can u explain ?

anonymous · Answer

The second one is female children 8 years of age

anonymous · Answer

can u explain ?

anonymous · Answer

C intersects D. Thats what the symbol between c and d is intersection. So intersection means what they both have in common.

anonymous · Answer

ok gotcha

anonymous · Answer

A subset is a little portiin of the whole set they give u

anonymous · Answer

Portion.

anonymous · Answer

marissa is right but she made a mistake in the first question. the answer is "c" and not "a". what marissa did is (c U d) which is taking all of the parts in c and "adding" them to all the parts in d. she explained it right though, so if you take marissas explanation, the intersection between c and d is all the numbers that show in c and also in d which are 3 6 and 9.