For a school play, student tickets cost 40 cents and adult tickets cost 75 cents. The total receipts for 90 tickets were $46.50. How many of each kind student and adult tickets were sold?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Simplify. 4+3/7x-2-2/7x a. 2-5/7x b. 6-1/7x c. 2+1/7x d. 6+5/7x