:

given the following information:

u = {x|x is a natural number less than 20}

a = {x| x is an odd natural number less than 16}

b = {x|x is a prime number greater than 5}

start by writing these sets out in roster method.

then you first want to find a', the complement of a.

a', represents all the elements in the universal set that are not in a. another way to look at it is u - a, or the universal set minus the set a.

next, you will find the union of a' and the set b. this means to combine all of elements in sets a' and b.

A' = { 2,4,6,8,10,12,14,16,17,18,19}

A' U B =  {2,4,6,8,10,12,14,16,17,18,19,7,11,13}

Step-by-step explanation:

A = {1,3,5,7,9,11,13,15}

B = {7,11,13,17,19}

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500