15. A security code used to consist of two odd digits, followed by four even digits. To allow more codes to
be generated, a new system uses two even digits,
followed by any three digits. If repeated digits are
allowed, the increase in the number of possible codes
is ? Note: zero is considered an even number.
A) 6,393,600
B) 9,375
C) 3,125
D) 15,625
What is the answer?

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

What ia the sum if the first 7 terms of the geometric series