Answer:
Since A={a,b}, then
. Remember that the Cartesian Product of two sets A, B is defined by
. Then

Answer:
Shes needs to work 26.67 hours
Step-by-step explanation:
In order to find the amount of time she needs to work, we need to divide the total by the rate that she earns money at. She needs a total of $400 and she gets 15 every hour.
400/15=26.67
Shes needs to work 26.67 hours
Answer:
-4.5
Step-by-step explanation:
Maths