For exercises 51–60, use 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}
(note: the prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19.) find the cardinality of each set.
answer
58.
n(b′)

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

The area of square garden is 300m squared. how long is the diagonal?

Need plz been trying to do it for a long time and still haven’t succeeded