The Zika virus present in a pregnant mother may lead to an infant born with microcephaly. Not all mothers who are infected with the Zika virus will have babies with Microcephaly but it does increase their risk. Using a deterministic model of causality (page 133) what type of cause is the Zika virus with regard to microcephaly?

Hint: X=Zika virus; Y=microcephaly

a) Necessary and sufficient
b) Sufficient but not necessary
c) Necessary but not sufficient
d) Neither necessary nor sufficient

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

Me 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.