Answer:
{0}
Step-by-step explanation:
{0} is not because 0 is not an element of set {1, 2, 3}
The null set is a subset of every set, so Ø is.
A set is a subset of itself.
Answer:

Step-by-step explanation:
Distribute the 4

Subtract the 7

Subtract y and add 1
0.07 is the larger number out of the two
Answer:
2^3 x 31
Step-by-step explanation:
31 is a prime number
If it was bought after 10% discount, it means it was bought at 90% of the original price:
90% = $450
1% = $5
100% = $5 x 100
100% = $500
The original price of the Play Station was $500.