Question

hematics

Answer 1

wdym

Answer 2

can someone help me with math? thank you

Answer 3

idk who can but i will find someone for u

Answer 4

thank you

Answer 5

np

Answer 6

Old question, but to help out future users:

part A 1:

U is called the universal set, and it includes everything in the box (including circles A and B). for Problem I, U = {1,2,3...9} so you know that the numbers 1-9 should be present somewhere inside the box

set A = {2,4,5,6,7}
set B = {2,3,4,5,6}

start by finding the numbers that are common to both A and B. for example, 4 is present in both sets A and B, so it would go where the intersection of A and B are

but, suppose you have a number like 7 that is only present in set A. you would put it inside circle A but do not put it inside circle B (so avoid the intersection)

repeat with the rest of the numbers in the list

then, anything that's still inside U goes inside the box, but outside the circles

repeat with problems A2-A3

Answer 7

part B: you need to know your set notation for this

for example, for B1: A' (with the ' meaning prime) means the complement of A, or in other words, everything that's *not* in set A.
B simply refers to everything *inside* circle B
the upside-down U sign means the intersection. here, it would mean everything that is common to both A' and B

in other words, take A', B, and only shade in the area that is common to both.

Answer 8

for C, simply use the information from the problem to fill out a venn diagram

Answer 9

cont:

70 people were surveyed ---> the total inside the box must be 70
"10 people chose neither" so 10 goes inside the box, but outside the circle
"35 preferred B" ---> be careful with this. preferring B includes *everything* inside circle B, including the intersection.
"17 preferred A only" ---> since it's A **only** put 17 inside A but ouside B