Find a ∩ b.
a) {3,5,6,7,8,11,12}
b) {3,5,6,7,8,12}
c) {3,7,6,5}
d) {3,7}

Step-by-step explanation:

The intersection of two sets A and B, consists of all elements that are both in A and B.

Therefore:

Look at the picture.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

3

step-by-step explanation: