Given the following sets.

a = {0, 1, 2, 3}
b = {a, b, c, d}
c = {0, a, 2, b}

find a c

{0, 1, 2, 3}
{a, b, c, d}
{0, a, 2, b}
empty set
{0, 2}

Customers at an ice-cream shop took a survey .the results showed that 144 customers rated the shop as being "very satisfactory ."this number represented 45%of the total nunber of customers who took the survey

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.