Solve x2 + 9x + 9 = 0.

quantity of negative 9 plus or minus 3 square root of 5 all over 2
quantity of 9 plus or minus 3 square root of 5 all over 2
quantity of negative 9 plus or minus square root of 117 all over 2
quantity of 9 plus or minus square root of 117 all over 2

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

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?