At joyce's school, tickets for a concert were sold at the rate of 40 per half hour. how many tickets were sold in 7 hours

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

What ordered pair represents this equation? 3x-y=8 and x+y=2

How many zeroes do we write when we write all the integers 1 to 243 in base 3?